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GnuTLS X.509 Certificate Signature Verification Denial of Service

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Release Date:  2004-08-03    Views:  9,507

Secunia Advisory SA12156

Where:

From remote

Impact:

DoS

Solution Status:

Vendor Patch

Software:

CVE Reference(s):

No CVE references.

Description


Patrik Hornik has reported a vulnerability in GnuTLS, which can be exploited by malicious people to cause a DoS (Denial of Service).

The vulnerability is caused due to an error when verifying X.509 certificate signatures. This can be exploited by passing a long certificate chain containing certificates with signatures, which have been signed with overly long RSA keys.

Successful exploitation causes an application linked to the library to consume large amounts of CPU resources.

The vulnerability has been reported in version 1.0.16. Prior versions may also be affected.


Solution:
Update to version 1.0.17.

Further details available to Secunia VIM customers

Provided and/or discovered by:
Patrik Hornik

Original Advisory:
http://www.hornik.sk/SA/SA-20040802.txt

Deep Links:
Links available to Secunia VIM customers

Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

Subject: GnuTLS X.509 Certificate Signature Verification Denial of Service

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