Bug 452467 - squidGuard: "trailing dot" domain access restriction bypass
squidGuard: "trailing dot" domain access restriction bypass
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
All Linux
medium Severity medium
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Assigned To: Red Hat Product Security
: Security
Depends On:
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Reported: 2008-06-23 03:49 EDT by Tomas Hoger
Modified: 2010-03-22 11:39 EDT (History)
4 users (show)

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Doc Type: Bug Fix
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Last Closed: 2010-03-22 11:39:50 EDT
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Description Tomas Hoger 2008-06-23 03:49:54 EDT
squidGuard upstream published security advisory regarding domain access
restriction bypass affecting systems with squid 3.0:

By adding a trailing dot to the domain it is possible to bypass the filter and
access blocked sites.

This only affects people using squidGuard with squid version 3.0 STABLE1 to
STABLE5 (higher version may be affected as well; in any case, if you are running
squid 3.0 make sure to patch). Squid version 2.6 is known to remove trailing
dots from domains before passing the URLs to squidGuard.


See upstream advisory for patch details.

Squid 3.0 is currently shipped in Fedora 9 and Rawhide.  Fedora 8 still ships
squid 2.6 and shouldn't be affected by this issue.
Comment 1 Gwyn Ciesla 2009-02-12 09:46:38 EST
1.2.1-2 with this patched on it's way through bodhi.

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