oss-security - Re: CVE Request -- perl v5.8.* -- stack overflow by processing certain regex (Gentoo BTS#313565 / RH BZ#580605)

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Date: Wed, 14 Apr 2010 10:00:29 -0400 (EDT)
From: Josh Bressers <bressers@...hat.com>
To: oss-security@...ts.openwall.com
Cc: "Steven M. Christey" <coley@...us.mitre.org>
Subject: Re: CVE Request -- perl v5.8.* -- stack overflow by
 processing certain regex (Gentoo BTS#313565 / RH BZ#580605)

As MITRE didn't reply, I'm going to assign CVE-2010-1158 to this to cover Perl.

We can address other things on a case by case basis if needed.

Thanks.

-- 
    JB


----- "Jan Lieskovsky" <jlieskov@...hat.com> wrote:

> Hi Steve, vendors,
> 
>    1, wouldn't like to open a can of worms,
>    2, but for purpose of properly tracking it, requesting a CVE id for
> the
>       following Perl regular expression engine issue:
> 
> Bruce Merry reported:
>    [1] http://bugs.gentoo.org/show_bug.cgi?id=313565
> 
> an integer overflow, leading to stack overflow in the way
> Perl regular expression engine processed certain regular
> expression(s). Remote attacker could use this flaw to cause
> a denial of service (crash of an application, using the
> Perl regular expression engine).
> 
> Public PoC from [1]:
> --------------------
>    perl -e 'if ((("a " x 100000) . "a\n") =~ /\A\S+(?: \S+)*\n\z/)
> {}'
> 
> References:
>    [2] http://bugs.gentoo.org/show_bug.cgi?id=313565
>    [3] https://bugzilla.redhat.com/show_bug.cgi?id=580605
> 
> Affected Perl versions:
>    Issue tested and confirmed in Perl of versions v5.8.*.
>    Versions of Perl v5.10.* are not affected by this.
> 
> Steve, what's the Mitre's opinion on cases like this --
> denial of service reachable via certain regular expression.
> 
> Should we track them on per issue basis? Or only for cases,
> where more than a DoS is possible? (doesn't seem to be
> this case though).
> 
> Thanks && Regards, Jan.
> --
> Jan iankko Lieskovsky / Red Hat Security Response Team

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