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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