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GnuTLS X.509 Certificate Signature Verification Denial of Service
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Secunia Advisory:
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SA12156
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Release Date:
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2004-08-03
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Critical:
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Less critical
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Impact:
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DoS
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Where:
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From remote
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Solution Status:
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Vendor Patch
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| Software: | GnuTLS 1.x
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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.
http://www.gnu.org/software/gnutls/download.html
Provided and/or discovered by:
Patrik Hornik
Original Advisory:
http://www.hornik.sk/SA/SA-20040802.txt
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
Secunia collects, validates, and verifies all vulnerability reports issued by security research groups, vendors, and others.
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4 Related Secunia Security Advisories
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1. GnuTLS Multiple Vulnerabilities
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2. GnuTLS RSA Signature Forgery Vulnerability
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3. GnuTLS libtasn1 DER Decoding Denial of Service Vulnerabilities
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4. GnuTLS Record Packet Parsing Denial of Service Vulnerability
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