RHEL 5 : gnutls (RHSA-2014:0594)

Medium Nessus Plugin ID 74301

Synopsis

The remote Red Hat host is missing one or more security updates.

Description

Updated gnutls packages that fix multiple 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.

The GnuTLS library provides support for cryptographic algorithms and for protocols such as Transport Layer Security (TLS). The gnutls packages also include the libtasn1 library, which provides Abstract Syntax Notation One (ASN.1) parsing and structures management, and Distinguished Encoding Rules (DER) encoding and decoding functions.

A flaw was found in the way GnuTLS parsed session IDs from ServerHello messages of the TLS/SSL handshake. A malicious server could use this flaw to send an excessively long session ID value, which would trigger a buffer overflow in a connecting TLS/SSL client application using GnuTLS, causing the client application to crash or, possibly, execute arbitrary code. (CVE-2014-3466)

It was discovered that the asn1_get_bit_der() function of the libtasn1 library incorrectly reported the length of ASN.1-encoded data.
Specially crafted ASN.1 input could cause an application using libtasn1 to perform an out-of-bounds access operation, causing the application to crash or, possibly, execute arbitrary code.
(CVE-2014-3468)

Multiple incorrect buffer boundary check issues were discovered in libtasn1. Specially crafted ASN.1 input could cause an application using libtasn1 to crash. (CVE-2014-3467)

Multiple NULL pointer dereference flaws were found in libtasn1's asn1_read_value() function. Specially crafted ASN.1 input could cause an application using libtasn1 to crash, if the application used the aforementioned function in a certain way. (CVE-2014-3469)

Red Hat would like to thank GnuTLS upstream for reporting these issues. Upstream acknowledges Joonas Kuorilehto of Codenomicon as the original reporter of CVE-2014-3466.

Users of GnuTLS are advised to upgrade to these updated packages, which correct these issues. For the update to take effect, all applications linked to the GnuTLS or libtasn1 library must be restarted.

Solution

Update the affected packages.

See Also

https://access.redhat.com/errata/RHSA-2014:0594

https://access.redhat.com/security/cve/cve-2014-3467

https://access.redhat.com/security/cve/cve-2014-3466

https://access.redhat.com/security/cve/cve-2014-3469

https://access.redhat.com/security/cve/cve-2014-3468

Plugin Details

Severity: Medium

ID: 74301

File Name: redhat-RHSA-2014-0594.nasl

Version: 1.8

Type: local

Agent: unix

Published: 2014/06/04

Updated: 2018/11/10

Dependencies: 12634

Risk Information

Risk Factor: Medium

CVSS v2.0

Base Score: 6.8

Temporal Score: 5.9

Vector: CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P

Temporal Vector: CVSS2#E:ND/RL:OF/RC:C

Vulnerability Information

CPE: p-cpe:/a:redhat:enterprise_linux:gnutls, p-cpe:/a:redhat:enterprise_linux:gnutls-debuginfo, p-cpe:/a:redhat:enterprise_linux:gnutls-devel, p-cpe:/a:redhat:enterprise_linux:gnutls-utils, cpe:/o:redhat:enterprise_linux:5

Required KB Items: Host/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list, Host/cpu

Exploit Available: false

Exploit Ease: No known exploits are available

Patch Publication Date: 2014/06/03

Reference Information

CVE: CVE-2014-3466, CVE-2014-3467, CVE-2014-3468, CVE-2014-3469

BID: 67741, 67745, 67748, 67749

RHSA: 2014:0594