Issued:

2012-03-27

Updated:

2012-03-27

RHSA-2012:0428 - Important: gnutls security update

Synopsis

Important: gnutls security update

Type/Severity

Security Advisory Important

Topic

Updated gnutls packages that fix three security issues are now available for Red Hat Enterprise Linux 5.

The Red Hat Security Response Team has rated this update as having important security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section.

Description

The GnuTLS library provides support for cryptographic algorithms and for protocols such as Transport Layer Security (TLS). GnuTLS includes libtasn1, a library developed for ASN.1 (Abstract Syntax Notation One) structures management that includes DER (Distinguished Encoding Rules) encoding and decoding.

A flaw was found in the way GnuTLS decrypted malformed TLS records. This could cause a TLS/SSL client or server to crash when processing a specially-crafted TLS record from a remote TLS/SSL connection peer. (CVE-2012-1573)

A flaw was found in the way libtasn1 decoded DER data. An attacker could create a carefully-crafted X.509 certificate that, when parsed by an application that uses GnuTLS, could cause the application to crash. (CVE-2012-1569)

A boundary error was found in the gnutls_session_get_data() function. A malicious TLS/SSL server could use this flaw to crash a TLS/SSL client or, possibly, execute arbitrary code as the client, if the client passed a fixed-sized buffer to gnutls_session_get_data() before checking the real size of the session data provided by the server. (CVE-2011-4128)

Red Hat would like to thank Matthew Hall of Mu Dynamics for reporting CVE-2012-1573 and CVE-2012-1569.

Users of GnuTLS are advised to upgrade to these updated packages, which contain backported patches to correct these issues. For the update to take effect, all applications linked to the GnuTLS library must be restarted, or the system rebooted.

Solution

Before applying this update, make sure all previously-released errata relevant to your system have been applied.

This update is available via the Red Hat Network. Details on how to use the Red Hat Network to apply this update are available at https://access.redhat.com/knowledge/articles/11258

Affected Products

Updated Packages

• gnutls-1.4.1-7.el5_8.2.ia64.rpm
• gnutls-debuginfo-1.4.1-7.el5_8.2.ppc.rpm
• gnutls-utils-1.4.1-7.el5_8.2.x86_64.rpm
• gnutls-devel-1.4.1-7.el5_8.2.ia64.rpm
• gnutls-devel-1.4.1-7.el5_8.2.s390.rpm
• gnutls-utils-1.4.1-7.el5_8.2.ia64.rpm
• gnutls-1.4.1-7.el5_8.2.ppc64.rpm
• gnutls-devel-1.4.1-7.el5_8.2.i386.rpm
• gnutls-utils-1.4.1-7.el5_8.2.ppc.rpm
• gnutls-1.4.1-7.el5_8.2.ppc.rpm
• gnutls-debuginfo-1.4.1-7.el5_8.2.i386.rpm
• gnutls-debuginfo-1.4.1-7.el5_8.2.ppc64.rpm
• gnutls-debuginfo-1.4.1-7.el5_8.2.s390.rpm
• gnutls-1.4.1-7.el5_8.2.i386.rpm
• gnutls-devel-1.4.1-7.el5_8.2.ppc64.rpm
• gnutls-utils-1.4.1-7.el5_8.2.s390x.rpm
• gnutls-devel-1.4.1-7.el5_8.2.ppc.rpm
• gnutls-devel-1.4.1-7.el5_8.2.x86_64.rpm
• gnutls-1.4.1-7.el5_8.2.s390.rpm
• gnutls-debuginfo-1.4.1-7.el5_8.2.s390x.rpm
• gnutls-devel-1.4.1-7.el5_8.2.s390x.rpm
• gnutls-1.4.1-7.el5_8.2.s390x.rpm
• gnutls-utils-1.4.1-7.el5_8.2.i386.rpm
• gnutls-1.4.1-7.el5_8.2.x86_64.rpm
• gnutls-debuginfo-1.4.1-7.el5_8.2.x86_64.rpm
• gnutls-debuginfo-1.4.1-7.el5_8.2.ia64.rpm
• gnutls-1.4.1-7.el5_8.2.src.rpm

Fixes

• This content is not included.BZ - 752308
• This content is not included.BZ - 804920
• This content is not included.BZ - 805432

CVEs

• CVE-2012-1569
• CVE-2011-4128
• CVE-2012-1573

References

• https://access.redhat.com/security/updates/classification/#important

Additional information

• The Red Hat security contact is This content is not included.secalert@redhat.com. More contact details at https://access.redhat.com/security/team/contact/.
• Offline Security Data data is available for integration with other systems. See Offline Security Data API to get started.