2.18.3, 2.20rc2, and 2.21 Security Advisory

Friday, Sep 30th, 2005

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:

* config.cgi exposes information to users who aren't logged in, even
when "requirelogin" is turned on in Bugzilla.

* It is possible to bypass the "user visibility groups" restrictions
if user-matching is turned on in "substring" mode. 

All affected installations are encouraged to upgrade as soon as

Vulnerability Details

Class:       Information Leak
Versions:    2.18rc1 - 2.18.3, 2.19 - 2.20rc2, 2.21

Description: config.cgi gives JavaScript and RDF information about Bugzilla
to third-party clients, including a list of products in the
Bugzilla installation. The "requirelogin" parameter requires
that all people be logged into Bugzilla before seeing any data,
as a security measure.
In affected versions, config.cgi is always accessible, and always
contains information to non-logged-in users, even when 
"requirelogin" is turned on, possibly exposing product names that
administrators expected to be confidential.
References:  https://bugzilla.mozilla.org/show_bug.cgi?id=308256

Class:       Information Leak
Versions:    2.19.1 - 2.20rc2, 2.21

Description: Bugzilla contains features to prevent users from "seeing" other 
users, enabled by the "usevisibilitygroups" parameter. Bugzilla
also contains a feature called "user matching," which enables
users to type in part of a username and get back a list of
possible matches.
If user matching is turned on and is in "substring" mode,
all matching users will be returned to a query, regardless
of the visibility groups settings, exposing users who should
be invisible.
References:  https://bugzilla.mozilla.org/show_bug.cgi?id=308662

Vulnerability Solutions

The fix for this issue is included in the 
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:



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

Issue 1 Reporter: Frédéric Buclin
Issue 1 Fixed by: Frédéric Buclin, Max Kanat-Alexander

Issue 2 Reporter: Frédéric Buclin
Issue 2 Fixed by: Joel Peshkin, Myk Melez, Max Kanat-Alexander

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


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