The "record packet parsing" in GnuTLS 1.2 before 1.2.3 and 1.0 before 1.0.25 allows remote attackers to cause a denial of service, possibly related to padding bytes in gnutils_cipher.c.

Updated GnuTLS packages that fix a remote denial of service vulnerability are available for Red Hat Enterprise Linux 4.

This update has been rated as having moderate security impact by the Red Hat Security Response Team.

The GnuTLS library implements Secure Sockets Layer (SSL v3) and Transport Layer Security (TLS v1) protocols.

A denial of service bug was found in the GnuTLS library versions prior to 1.0.25. A remote attacker could perform a carefully crafted TLS handshake against a service that uses the GnuTLS library causing the service to crash. The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CVE-2005-1431 to this issue.

All users of GnuTLS are advised to upgrade to these updated packages and to restart any services which use GnuTLS.

A Denial of Service vulnerability was discovered in the GNU TLS library, which provides common cryptographic algorithms and is used by many applications in Ubuntu. Due to a missing sanity check of the padding length field, specially crafted ciphertext blocks caused an out of bounds memory access which could crash the application. It was not possible to exploit this to execute any attacker specified code.

Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote Redhat Enterprise Linux 4 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2005:430 advisory.

    The GnuTLS library implements Secure Sockets Layer (SSL v3) and Transport     Layer Security (TLS v1) protocols.

    A denial of service bug was found in the GnuTLS library versions prior to     1.0.25. A remote attacker could perform a carefully crafted TLS handshake     against a service that uses the GnuTLS library causing the service to     crash. The Common Vulnerabilities and Exposures project (cve.mitre.org) has     assigned the name CAN-2005-1431 to this issue.

    All users of GnuTLS are advised to upgrade to these updated packages and to     restart any services which use GnuTLS.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Two vulnerabilities were discovered in the GnuTLS library. The first is a vulnerability in the way GnuTLS does record packet parsing; the second is a flaw in the RSA key export functionality. These could be exploited by a remote attacker to cause a Denial of Service to any program using the GnuTLS library.

The provided packages have been patched to correct these issues.

The remote host is affected by the vulnerability described in GLSA-200505-04 (GnuTLS: Denial of Service vulnerability)

    A vulnerability has been discovered in the record packet parsing     in the GnuTLS library. Additionally, a flaw was also found in the RSA     key export functionality.
  Impact :

    A remote attacker could exploit this vulnerability and cause a     Denial of Service to any application that utilizes the GnuTLS library.
  Workaround :

    There is no known workaround at this time.

ID	Name	Product	Family	Severity
21938	CentOS 4 : gnutls (CESA-2005:430)	Nessus	CentOS Local Security Checks	medium
20516	Ubuntu 4.10 / 5.04 : gnutls11, gnutls10 vulnerability (USN-126-1)	Nessus	Ubuntu Local Security Checks	medium
18407	RHEL 4 : gnutls (RHSA-2005:430)	Nessus	Red Hat Local Security Checks	high
18273	Mandrake Linux Security Advisory : gnutls (MDKSA-2005:084)	Nessus	Mandriva Local Security Checks	medium
18230	GLSA-200505-04 : GnuTLS: Denial of Service vulnerability	Nessus	Gentoo Local Security Checks	medium

Detections

Analytics

CVE-2005-1431

high

Tenable Plugins

medium

medium

high

medium

medium