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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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