Re: CVE Request -- glibc: DoS due to a buffer overrun in regexp matcher by processing multibyte characters

[Kurt Seifried <kseifried () redhat com>]

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On 01/30/2013 04:40 AM, Jan Lieskovsky wrote:
> Hello Kurt, Steve, vendors,
>
> a security flaw was found in the regular expression matching 
> routine of glibc, the GNU libc libraries, processed multibyte 
> characters input. If an application utilized the glibc's regular 
> expression matching mechanism, an attacker could provide a
> specially-crafted input that, when processed would lead to that
> executable crash.
>
> Upstream bug report: [1]
> http://sourceware.org/bugzilla/show_bug.cgi?id=15078
>
> Relevant patch: [2]
> http://sourceware.org/ml/libc-alpha/2013-01/msg00967.html
>
> More background: * (from Paolo): Jan 30 11:34:19 <bonzini> iankko:
> it is a memset(foo, 0, ...) that overruns the buffer, so it's not
> controllable by the attacker
>
> * but the denial of service scenario / attack vector is valid
> (consider network facing application using glibc's regexp matching
> on untrusted input)
>
> Could you allocate a CVE id for this?
>
> Thank you && Regards, Jan. -- Jan iankko Lieskovsky / Red Hat
> Security Response Team


Please use CVE-2013-0242 for this issue.

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

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