2.18.4, 2.20, and 2.21.1 Security Advisory

Monday, Feb 20th, 2006

Summary
=======

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

* The 'whinedays' and 'mostfreqthreshold' parameters are not correctly
  validated in editparams.cgi. The first one can lead to SQL injection.

* Escaped HTML markup in titles of RSS feeds are incorrectly decoded by
  some RSS readers and could potentially lead to XSS vulnerabilities.

* The login form on the home page, in conjuction with very specific
  configuration settings and a specially formed URL, may redirect you
  outside the Bugzilla installation, allowing the login name and password
  to be stolen.

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


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

Class:       SQL injection
Affected:    2.17.1 and above
Description: The 'whinedays' parameter, editable from editparams.cgi,
             is not validated before being saved. This can lead to SQL
             injection in the whineatnews.pl script. This injection
             requires administrative privileges.
             The validation for the 'mostfreqthreshold' parameter is also
             missing, but this is not exploitable.
References:  https://bugzilla.mozilla.org/show_bug.cgi?id=312498


Class:       Cross Site Scripting
Affected:    2.20rc1 - 2.20, 2.21.1
Description: Some RSS readers incorrectly decode escaped HTML markup in
             feed titles and this could be used to inject some scripts.
             Although this is not a Bugzilla bug, we prefer to shift to
             Atom feeds, where the RFC is unambiguous about HTML markup
             in feed titles.
References:  https://bugzilla.mozilla.org/show_bug.cgi?id=313441


Class:       Sensitive Data Exposure
Affected:    2.19.3 and above
Description: When the Bugzilla login page is at a subdirectory of the web
             server and the subdirectory name is a resolvable host on the
             victim's local network, it is possible to craft a URL that,
             when used to login to Bugzilla, would send the user's
             credentials to this host.
             These conditions make this flaw very difficult to exploit.
References:  https://bugzilla.mozilla.org/show_bug.cgi?id=325079


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

The fix for these issues is included in the 
releases. Upgrading to a release with the relevant fix will
protect your installation from possible exploits of these issues.

If you are unable to upgrade but would like to patch just the security
vulnerability, there are patches available for the issues 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:


Issue 1 Reporter: Frédéric Buclin
Issue 1 Fixed by: Frédéric Buclin, Teemu Mannermaa


Issue 2 Reporter: Phil Ringnalda
Issue 2 Fixed by: Phil Ringnalda, Frédéric Buclin, Myk Melez


Issue 3 Reporter: Frédéric Buclin
Issue 3 Fixed by: Frédéric Buclin

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 support-bugzilla mailing list.
https://www.bugzilla.org/support/ has directions for accessing this forum.