There has been the following change in apache2:
apache2 (2.2.22-4) unstable; urgency=high
* CVE-2012-0216: Remove "Alias /doc /usr/share/doc" from the default virtual
hosts' config files.
If scripting modules like mod_php or mod_rivet are enabled on systems
where either 1) some frontend server forwards connections to an apache2
backend server on the localhost address, or 2) the machine running
apache2 is also used for web browsing, this could allow a remote
attacker to execute example scripts stored under /usr/share/doc.
Depending on the installed packages, this could lead to issues like cross
site scripting, code execution, or leakage of sensitive data.
-- Stefan Fritsch <s...@debian.org> Sun, 15 Apr 2012 23:41:43 +0200
More information on:
http://www.debian.org/security/2012/dsa-2452.en.html
However, what if some user has a symlink to /usr/share/doc in his
public_html? I haven't tried, but it seems that the bug would still
occur (otherwise the right solution wouldn't have been to remove
the alias, but to change how the scripting modules can affect some
paths). IMHO, the real bug is in mod_php or mod_rivet, that shouldn't
be active (at least concerning the scripting features) by default
unless this is explicitly told with some "Options" for the concerned
directory.
--
Vincent Lefèvre <vinc...@vinc17.net> - Web: <http://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <http://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)
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