Secunia

Some vulnerabilities have been reported in Urchin, which can be exploited by malicious users to disclose sensitive information and by malicious people to conduct cross-site scripting attacks.

1) Input passed to the "dtc", "vid", "n", "dt", "ed", and "bd" parameters in urchin.cgi is not properly sanitised before being returned to the user. This can be exploited to execute arbitrary HTML and script code in a user's browser session in context of an affected site.

2) Input passed via the URL to session.cgi is not properly sanitised before being returned to the user. This can be exploited to execute arbitrary HTML and script code in a user's browser session in context of an affected site.

3) Input passed via the "gfid" parameter to session.cgi (when "app" is set to "urchin.cgi", "action" is set to "prop", and "sid", "rid", and "cmd" are set) is not properly verified before being used to display files. This can be exploited to disclose the contents of arbitrary files via directory traversal attacks.

Vulnerability #1 is reported in version 5.6.00r2 and vulnerabilities #2 and #3 are reported in 5.7.03. Other versions may also be affected.

Solution
Apply patches, which fix vulnerabilities #1 and #2. Filter malicious characters and character sequences in a web proxy.

Provided and/or discovered by
1) r0t
2) Apparently independently discovered by Adrian Pastor and Frederick Young
3) Kristian Erik Hermansen

Changelog
Further details available in Customer Area

Original Advisory
Google:
http://www.google.com/support/urchin45/bin/answer.py?hl=en&answer=76399
http://www.google.com/support/urchin45/bin/answer.py?hl=en&answer=77031

r0t:
http://pridels-team.blogspot.com/2007/09/urchin-5x-multiple-xss-vuln.html

Adrian Pastor and Frederick Young:
http://www.gnucitizen.org/blog/google-urchin-password-theft-madness
http://ha.ckers.org/blog/20070823/xss-and-possible-information-disclosure-in-urchin/

Kristian Erik Hermansen:
http://archives.neohapsis.com/archives/fulldisclosure/2010-12/0313.html
http://archives.neohapsis.com/archives/fulldisclosure/2010-12/0360.html

Deep Links
Links available in Customer Area