Title: GnuTLS X.509 Unknown Hash Algorithm Denial of Service Vulnerability
Severity: MODERATE
Description:
GNU Transport Layer Security Library (GnuTLS) is a library that implements the TLS 1.0 and SSL 3.0 protocols. It is maintained by GNU and is available for UNIX and Linux variants.
GnuTLS is prone to a denial-of-service vulnerability that occurs when processing X.509 certificates that use unsupported signature algorithms. The issue affects the '_gnutls_x509_oid2mac_algorithm' function in the 'lib/gnutls_algorithms.c' file and stems from a NULL pointer dereference error.
Successfully exploiting this issue allows attackers to crash applications using the affected library, denying service to legitimate users.
Versions prior to GnuTLS 1.4.2 are vulnerable.
Affected Products:
- GNU GnuTLS 1.0.0
- GNU GnuTLS 1.0.1
- GNU GnuTLS 1.0.13
- GNU GnuTLS 1.0.14
- GNU GnuTLS 1.0.15
- GNU GnuTLS 1.0.16
- GNU GnuTLS 1.0.17
- GNU GnuTLS 1.0.2
- GNU GnuTLS 1.0.20
- GNU GnuTLS 1.0.23
- GNU GnuTLS 1.0.25
- GNU GnuTLS 1.0.3
- GNU GnuTLS 1.0.4
- GNU GnuTLS 1.0.5
- GNU GnuTLS 1.0.6
- GNU GnuTLS 1.0.7
- GNU GnuTLS 1.0.8
- GNU GnuTLS 1.0.9
- GNU GnuTLS 1.2.0
- GNU GnuTLS 1.2.1
- GNU GnuTLS 1.2.10
- GNU GnuTLS 1.2.2
- GNU GnuTLS 1.2.3
- GNU GnuTLS 1.2.4
- GNU GnuTLS 1.2.5
- GNU GnuTLS 1.2.6
- GNU GnuTLS 1.2.7
- GNU GnuTLS 1.2.8
- GNU GnuTLS 1.2.9
- GNU GnuTLS 1.3.0
- GNU GnuTLS 1.3.1
- GNU GnuTLS 1.3.2
- GNU GnuTLS 1.3.3
- GNU GnuTLS 1.3.4
- GNU GnuTLS 1.4.0
- Red Hat Fedora Core4
- Ubuntu Ubuntu Linux 6.06 LTS amd64
- Ubuntu Ubuntu Linux 6.06 LTS i386
- Ubuntu Ubuntu Linux 6.06 LTS powerpc
- Ubuntu Ubuntu Linux 6.06 LTS sparc
References:
- GNU: GnuTLS Homepage
- GNU: [gnutls-dev] GnuTLS 1.4.2
- GNU: [gnutls-dev] Re: [Fwd: crash in GNUTLS-1.4.0]
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