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[Full-disclosure] FYI: Apache httpd NoFollowSymLink follows symlinks feature
- To: full-disclosure@xxxxxxxxxxxxxxxxx
- Subject: [Full-disclosure] FYI: Apache httpd NoFollowSymLink follows symlinks feature
- From: halfdog <me@xxxxxxxxxxx>
- Date: Fri, 24 Jun 2011 15:14:47 +0000
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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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