Re: [SECURITY] [DSA 590-1] New gnats packages fix arbitrary code execution

["Phantasmal Phantasmagoria" <phantasmal () hush ai>]

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On Thu, 09 Nov 2004 09:57:27 -0600 Martin Schulze wrote:
> Package        : gnats
> Vulnerability  : format string vulnerability
> Problem-Type   : remote
> Debian-specific: no
> CVE ID         : CAN-2004-0623
> BugTraq ID     : 10609
> Debian Bug     : 278577
>
> Khan Shirani discovered a format string vulnerability in gnats,
> the
> GNU problem report management system.  This problem may be
> exploited
> to execute arbitrary code.
>
> For the stable distribution (woody) this problem has been fixed in
> version 3.999.beta1+cvs20020303-2.
>
> For the unstable distribution (sid) this problem has been fixed in
> version 4.0-7.
>
> We recommend that you upgrade your gnats package.

There are exactly zero ways of exploiting this "moderately critical"
 [1] vulnerability. In fact, it's not a vulnerability at all. If
Shirani had done a two minute check of the relevant log_msg() calls
(i.e. those with a severity of LOG_ERR as opposed to LOG_INFO) he
would of found zero instances of user supplied data being used as
an argument.

Before someone embarrasses themselves please take note that the LOG_
INFO severity log_msg() calls do not get passed to syslog(), as
debug_level can only be set to LOG_INFO by a call to
enable_debugging(), of which there are none.

[1] http://secunia.com/advisories/11069/

Yours pedantically,
Phantasmal Phantasmagoria


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