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Re: CVE request: nginx world-readable logdir
From: Kurt Seifried <kseifried () redhat com>
Date: Thu, 21 Feb 2013 21:19:20 -0700

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On 02/21/2013 03:51 PM, Anders Petersson wrote:
2013/2/21 Anders Petersson <anders () xvx se>

However on Debian Squeeze the logs themselves are not
world-readable (at least on my system):

$ ls -la /var/log/nginx/ total 452 drwxr-xr-x 2 root     root
4096 Feb 21 06:25 . drwxr-xr-x 9 root     root  4096 Feb 21 06:25
.. -rw-r----- 1 www-data adm    934 Feb 21 18:40 access.log 
-rw-r----- 1 www-data adm  20134 Feb 21 03:46 access.log.1


Apologies for the noise, Henri is absolutely correct. nginx on
Debian Squeeze is affected. My observation is merely an artifact of
the logrotation which fixes the permissions in a cron-job (hence if
you have the logrotate package installed on Debian Squeeze the logs
will have correct permissions as soon as the logs have been rotated
once, but left to it's own devices nginx will create the log file
world-readable, also the nginx package does not depend on the
logrotate package so it may not be installed).

# rm /var/log/nginx/access.log # service nginx restart $ ls -l
/var/log/nginx/ total 1088 -rw-r--r-- 1 root     root     0 Feb 21
23:31 access.log

-- Anders Petersson


Please use CVE-2013-0337 for nginx world readable log files. Also
Fedora 16 (and I assume 17/18) are affected by this:

# ls -la /var/log/nginx/
total 8
drwxr-xr-x.  2 root root 4096 Feb 21 21:18 .
drwxr-xr-x. 28 root root 4096 Feb 21 21:17 ..
- -rw-r--r--.  1 root root    0 Feb 21 21:18 access.log
- -rw-r--r--.  1 root root    0 Feb 21 21:18 error.log

Sigh. I'm guessing a lot of other web servers are vulnerable by
default on Linux and BSD distros too. Anyone care to make such a list
and send it in?

- -- 
Kurt Seifried Red Hat Security Response Team (SRT)
PGP: 0x5E267993 A90B F995 7350 148F 66BF 7554 160D 4553 5E26 7993

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