TITLE:
GnuTLS libtasn1 DER Decoding Denial of Service Vulnerabilities

SECUNIA ADVISORY ID:
SA18794

VERIFY ADVISORY:
http://secunia.com/advisories/18794/

CRITICAL:
Moderately critical

IMPACT:
DoS

WHERE:
>From remote

SOFTWARE:
GnuTLS 1.x
http://secunia.com/product/3748/
GnuTLS libtasn1 Tiny ASN.1 library 0.x
http://secunia.com/product/7952/

DESCRIPTION:
Evgeny Legerov has reported some vulnerabilities in GnuTLS libtasn1,
which potentially can be exploited by malicious people to cause a DoS
(Denial of Service).

The vulnerabilities are caused due to errors within the DER decoder
in libtasn1. This can be exploited to crash an application that uses
the library via specially-crafted input.

The vulnerabilities have been reported in libtasn1 prior to 0.2.18
and in GnuTLS prior to 1.2.10.

SOLUTION:
Update to the fixed versions.
http://www.gnu.org/software/gnutls/download.html

Libtasn1:
Update to version 0.2.18.

GnuTLS:
Update to version 1.2.10.

The vulnerabilities have also been fixed in GnuTLS version 1.3.4
(experimental).

PROVIDED AND/OR DISCOVERED BY:
Evgeny Legerov, GLEG Ltd.

ORIGINAL ADVISORY:
http://lists.gnupg.org/pipermail/gnutls-dev/2006-February/001058.html

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