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Secunia Network Software Inspector 2.0 (NSI) - Public Beta

The Public Beta has ended. Thanks to all that participated.

Learn more:
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TITLE:
GnuTLS Multiple Vulnerabilities

SECUNIA ADVISORY ID:
SA30287

VERIFY ADVISORY:
http://secunia.com/advisories/30287/

CRITICAL:
Highly critical

IMPACT:
DoS, System access

WHERE:
>From remote

REVISION:
2.0 originally posted 2008-05-21

SOFTWARE:
GnuTLS 1.x
http://secunia.com/product/3748/
GnuTLS 2.x
http://secunia.com/product/18736/

DESCRIPTION:
Some vulnerabilities have been reported in GnuTLS, which can be
exploited by malicious people to cause a DoS (Denial of Service) or
to potentially compromise an application using the library.

1) A boundary error exists in the processing "Client Hello" messages
containing a "Server Name" extension. This can be exploited to cause
a heap-based buffer overflow via a specially crafted TLS packet.

Successful exploitation may allow execution of arbitrary code.

2) A NULL-pointer dereference error in the processing of TLS packets
containing multiple "Client Hello" messages can be exploited to crash
an affected application.

3) A signedness error exists within the
"_gnutls_ciphertext2compressed()" function in lib/gnutls_cipher.c.
This can be exploited to cause an out of bounds read and crash an
affected application via specially crafted, encrypted TLS data.

The vulnerabilities are reported in versions prior to 2.2.4.

SOLUTION:
Update to version 2.2.5 or apply patches (see vendor advisory for
more details).

PROVIDED AND/OR DISCOVERED BY:
Ossi Herrala and Jukka Taimisto from the CROSS project at
Codenomicon. Reported via CERT-FI.

CHANGELOG:
2008-05-21: Updated "Solution" section due to an error introduced in
version 2.2.4. Updated "Original Advisory" section.

ORIGINAL ADVISORY:
CERT-FI:
http://www.cert.fi/haavoittuvuudet/advisory-gnutls.html

GnuTLS:
http://lists.gnu.org/archive/html/gnutls-devel/2008-05/msg00060.html

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