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             AUSCERT External Security Bulletin Redistribution

                    ESB-2008.0455 -- [Win][UNIX/Linux]
                        cPanel XSRF vulnerabilities
                                5 May 2008


        AusCERT Security Bulletin Summary

Product:              cPanel
Publisher:            US-CERT
Operating System:     UNIX variants (UNIX, Linux, OSX)
Impact:               Cross-site Request Forgery
Access:               Remote/Unauthenticated
CVE Names:            CVE-2008-2043

Original Bulletin:    http://www.kb.cert.org/vuls/id/584089

Revision History:  May 5 2008: Added CVE
                   May 2 2008: Initial Release

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Vulnerability Note VU#584089

cPanel XSRF vulnerabilities


cPanel contains multiple cross-site request forgery (XSRF) vulnerabilities. 
If successfully exploited, these vulnerabilities may allow an attacker to 
execute arbitrary commands.

I. Description

cPanel is a web-based tool that is designed to automate and control web sites 
and servers.

cPanel contains multiple cross-site request forgery (XSRF) vulnerabilities. 
These vulnerabilities may be triggered by a remote attacker who convinces an 
administrator to browse to a malicious web site while logged into their 
cPanel account.

II. Impact

An attacker may be able to take actions that only authorized administrators 
should be able to execute.

III. Solution

We are currently unaware of a practical solution to this problem.

Enable referrer checking

Referrer checking may mitigate some XSRF attacks. To enable referrer checking, 
follow the below steps. Note that referrer checking may cause some 
applications to fail.

   1. navigate to Server configuration
   2. go to Tweak Settings
   3. go to Security in WebHost Manager
   4. check the box and save the page

Do not browse to untrusted sites

Administrators can mitigate XSRF vulnerabilities in cPanel and other 
browser-based tools by not browsing to untrusted websites while logged into 
their account.

Systems Affected
Vendor           Status        Date Updated
cPanel Inc.     Vulnerable      28-Apr-2008




Thanks to Michael Brooks for information that was used in this report.

This document was written by Ryan Giobbi.
Other Information
Date Public     01/05/2008
Date First Published    30/04/2008 15:47:27
Date Last Updated       01/05/2008
CERT Advisory    
CVE Name         
US-CERT Technical Alerts         
Metric  2.25
Document Revision       15

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