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TITLE:
GnuTLS libtasn1 ASN1 Length DER Decoding Vulnerability

SECUNIA ADVISORY ID:
SA48397

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/48397/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=48397

RELEASE DATE:
2012-03-21

DISCUSS ADVISORY:
http://secunia.com/advisories/48397/#comments

AVAILABLE ON SITE AND IN CUSTOMER AREA:
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 * Criticality Level
 * Impact
 * Where
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 * Operating System / Software
 * CVE Reference(s)

http://secunia.com/advisories/48397/

ONLY AVAILABLE IN CUSTOMER AREA:
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https://ca.secunia.com/?page=viewadvisory&vuln_id=48397

ONLY AVAILABLE WITH SECUNIA CSI AND SECUNIA PSI:
 * AUTOMATED SCANNING

http://secunia.com/vulnerability_scanning/personal/
http://secunia.com/vulnerability_scanning/corporate/wsus_sccm_3rd_third_party_patching/

DESCRIPTION:
Mu Dynamics has reported a vulnerability in GnuTLS libtasn1 Tiny
ASN.1 library, which can be exploited by malicious people to
potentially compromise an application using the library.

The vulnerability is caused due to certain functions (e.g.
"asn1_der_decoding()") not properly checking ASN1 length result from
the "asn1_get_length_der()" function. This can be exploited to cause
the library to use a large length value and corrupt memory via e.g. a
specially crafted X.509 client certificate.

Successful exploitation may allow execution of arbitrary code.

The vulnerability is reported in versions prior to 2.12.

SOLUTION:
Update to version 2.12.

PROVIDED AND/OR DISCOVERED BY:
Matthew Hall, Mu Dynamics

ORIGINAL ADVISORY:
GnuTLS libtasn1:
http://thread.gmane.org/gmane.comp.gnu.libtasn1.general/54

Mu Dynamics (MU-201202-02):
http://blog.mudynamics.com/2012/03/20/gnutls-and-libtasn1-vulns/

OTHER REFERENCES:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

DEEP LINKS:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXTENDED DESCRIPTION:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXTENDED SOLUTION:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXPLOIT:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

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