full-disclosure - FYI: Apache httpd NoFollowSymLink follows symlinks feature

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Message-ID: <4E04A9E7.8000202@halfdog.net>
Date: Fri, 24 Jun 2011 15:14:47 +0000
From: halfdog <me@...fdog.net>
To: full-disclosure@...ts.grok.org.uk
Subject: FYI: Apache httpd NoFollowSymLink follows
	symlinks feature

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For those, who did not already know:

Due to specification, apache follows symlinks even when -FollowSymLinks
is set, when the data is modified concurrently. This can be trivially
shown as demonstrated in
http://www.halfdog.net/Security/2011/ApacheNoFollowSymlinkTimerace/ .
When performing host hardening, do not think, the -FollowSymLinks option
alone will prevent you from symlink attacks.

- -- 
http://www.halfdog.net/
PGP: 156A AE98 B91F 0114 FE88  2BD8 C459 9386 feed a bee
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