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Category:   Application (Generic)  >   Bugzilla Vendors:   Mozilla.org
Bugzilla Input Validation Flaw in Dependency Graph Bug Summary Lets Remote Conduct Cross-Site Scripting Attacks
SecurityTracker Alert ID:  1035891
SecurityTracker URL:  http://securitytracker.com/id/1035891
CVE Reference:   CVE-2016-2803   (Links to External Site)
Date:  May 17 2016
Impact:   Disclosure of authentication information, Disclosure of user information, Execution of arbitrary code via network, Modification of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 2.16rc1 to 4.4.11, 4.5.1 to 5.0.2
Description:   A vulnerability was reported in Bugzilla. A remote user can conduct cross-site scripting attacks.

The software does not properly filter HTML code from user-supplied input in the bug summary in dependency graphs before displaying the input. A remote user can cause arbitrary scripting code to be executed by the target user's browser. The code will originate from the site running the Bugzilla software and will run in the security context of that site. As a result, the code will be able to access the target user's cookies (including authentication cookies), if any, associated with the site, access data recently submitted by the target user via web form to the site, or take actions on the site acting as the target user.

Wladimir Palant reported this vulnerability.

Impact:   A remote user can access the target user's cookies (including authentication cookies), if any, associated with the site running the Bugzilla software, access data recently submitted by the target user via web form to the site, or take actions on the site acting as the target user.
Solution:   The vendor has issued a fix (4.4.12, 5.0.3).

The vendor's advisory is available at:

https://www.bugzilla.org/security/4.4.11/

Vendor URL:  www.bugzilla.org/security/4.4.11/ (Links to External Site)
Cause:   Input validation error
Underlying OS:  Linux (Any), UNIX (Any)

Message History:   None.


 Source Message Contents

Subject:  Security advisory for Bugzilla 5.0.3 and 4.4.12

Summary
=======

Bugzilla is a Web-based bug-tracking system used by a large number of
software projects. The following security issue has been discovered
in Bugzilla:

* A specially crafted bug summary could trigger XSS in dependency graphs.

All affected installations are encouraged to upgrade as soon as
possible.


Vulnerability Details
=====================

Class:       Cross-Site Scripting
Versions:    Bugzilla 2.16rc1 to 4.4.11, 4.5.1 to 5.0.2
Fixed In:    4.4.12, 5.0.3
Description: Due to an incorrect parsing of the image map generated by the
             dot script, a specially crafted bug summary could trigger XSS
             in dependency graphs.
References:  https://bugzilla.mozilla.org/show_bug.cgi?id=1253263
CVE Number:  CVE-2016-2803


Vulnerability Solutions
=======================

The fix for this issue is included in the 4.4.12 and 5.0.3
releases. Upgrading to a release with the relevant fix will
protect your installation from possible exploits of this issue.

If you are unable to upgrade but would like to patch just the security
vulnerability, there are patches available for the issue at the
"References" URL.

Full release downloads, patches to upgrade Bugzilla from previous
versions, and git upgrade instructions are available at:

  https://www.bugzilla.org/download/


Credits
=======

The Bugzilla team wish to thank the following people for their
assistance in locating, advising us of, and assisting us to fix this
issue:

Reporter: Wladimir Palant

General information about the Bugzilla bug-tracking system can be found
at:

  https://www.bugzilla.org/

Comments and follow-ups can be directed to the mozilla.support.bugzilla
newsgroup or the support-bugzilla mailing list.
https://www.bugzilla.org/support/ has directions for accessing these
forums.
 
 


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