2.20.4, 2.22.2, and 3.0 Security Advisory

Thursday, Aug 23rd, 2007

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:

* A possible cross-site scripting (XSS) vulnerability when filing bugs
  using the guided form.

* When using email_in.pl, insufficiently escaped data may be passed to
  sendmail.

* Users using the WebService interface may access Bugzilla's time-tracking
  fields even if they normally cannot see them.

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


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

Class:       Cross-Site Scripting
Affected:    2.17.1 and above
Description: Bugzilla does not properly escape the 'buildid' field in
             the guided form when filing bugs. From 2.17.1 till 2.23.3,
             this field was based exclusively on the User-Agent string
             returned by your web browser. Since 2.23.4, this parameter
             can be defined in the URL passed to enter_bug.cgi, overwriting
             the User-Agent string and may lead to cross-site scripting.
             The guided form is not usually used by Bugzilla installations,
             as it is shipped only as an example to be modified for their
             own use.


Class:       Command Injection
Affected:    2.23.4 and above
Description: Bugzilla 2.23.4 and newer use the Email:: modules instead
             of the Mail:: and MIME:: ones. The argument passed to the -f
             option of Email::Send::Sendmail() is insufficiently escaped
             and may lead to limited command injection when called from
             email_in.pl, a script which was also introduced in 2.23.4.


Class:       Information Leak
Affected:    2.23.3 and above
Description: Bugzilla's WebService (XML-RPC) interface allows you to access
             the time-tracking fields (such as Deadline, Estimated Time, etc.)
             on all bugs, even if you normally cannot access time-tracking
             fields.


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: Masahiro Yamada
Issue 1 Fixed by: Frédéric Buclin


Issue 2 Reporter: Loïc Minier
Issue 2 Fixed by: Loïc Minier, Max Kanat-Alexander, Frédéric Buclin


Issue 3 Reporter: Frédéric Buclin
Issue 3 Fixed by: Frédéric Buclin, Max Kanat-Alexander

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.