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TITLE:
GnuPG "parse-packet.c" Denial of Service Vulnerability

SECUNIA ADVISORY ID:
SA20783

VERIFY ADVISORY:
http://secunia.com/advisories/20783/

CRITICAL:
Moderately critical

IMPACT:
DoS

WHERE:
>From remote

SOFTWARE:
GnuPG / gpg 1.4.x
http://secunia.com/product/8087/

DESCRIPTION:
A vulnerability has been reported in GnuPG, which potentially can be
exploited by malicious people to cause a DoS (Denial of Service).

The vulnerability is cause due to an input validation error within
"parse-packet.c" when handling the length of a message packet. This
can be exploited to cause gpg to consume large amount of memory or
crash via an overly large packet length in a message packet. This can
be further exploited to cause an integer overflow which leads to a
possible memory corruption that crashes gpg.

Successful exploitation requires that the "--no-armor" option is
used.

The vulnerability has been reported in version 1.4.3 and in
development version 1.9.20. Prior versions may also be affected.

SOLUTION:
The vulnerability has been fixed in the CVS repositories.

PROVIDED AND/OR DISCOVERED BY:
Evgeny Legerov

ORIGINAL ADVISORY:
http://seclists.org/lists/fulldisclosure/2006/May/0774.html
http://cvs.gnupg.org/cgi-bin/viewcvs.cgi/trunk/g10/parse-packet.c?rev=4157&r1=4141&r2=4157

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