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Date: Mon, 17 Oct 2011 12:24:29 +0200
From: Timo Warns <warns@...-sense.de>
To: oss-security@...ts.openwall.com
Subject: Re: CVE request: double-free vulnerability in logsurfer
Am 17.10.2011 12:07, schrieb Marcus Meissner:
> On Mon, Oct 17, 2011 at 12:02:29PM +0200, Timo Warns wrote:
>> Gregor Kopf of Recurity Labs GmbH found a double-free vulnerability in
>> Logsurfer affecting the function prepare_exec(). The vulnerability is caused by
>> an insufficient treatment of an error condition that is returned by the
>> function get_word() when it is unable to correctly parse its input.
>>
>> The following versions of logsurfer are affected:
>>
>> Logsurfer 1.5b and previous versions
>> Logsurfer+ 1.7 and previous versions
>>
>> A patch is available at http://logsurfer.git.sourceforge.net/git/gitweb.cgi?p=logsurfer/logsurfer;a=commit;h=07983748da9ea3d4954b80f02fed692fe21b1134
>
> How can this be exploited?
>
> It seems to happen in the argument handling and I doubt an attacker can inject arguments?
Logsurfer allows to use substrings of log-file entries as arguments for
calling external commands. An attacker is able to exploit this
vulnerability by injecting specially crafted strings into a log-file
that is processed by logsurfer.
Cheers, Timo
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