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Date: Thu, 08 Apr 2010 18:48:14 +0200
From: Jan Lieskovsky <jlieskov@...hat.com>
To: "Steven M. Christey" <coley@...us.mitre.org>
CC: oss-security <oss-security@...ts.openwall.com>
Subject: CVE Request -- perl v5.8.* -- stack overflow by processing certain
regex (Gentoo BTS#313565 / RH BZ#580605)
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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