RHEL 6 : krb5 (RHSA-2011:0356)

high Nessus Plugin ID 52700

Synopsis

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

Description

Updated krb5 packages that fix one security issue are now available for Red Hat Enterprise Linux 6.

The Red Hat Security Response Team has rated this update as having important security impact. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available from the CVE link in the References section.

Kerberos is a network authentication system which allows clients and servers to authenticate to each other using symmetric encryption and a trusted third-party, the Key Distribution Center (KDC). The Public Key Cryptography for Initial Authentication in Kerberos (PKINIT) capability provides support for using public-key authentication with Kerberos.

A double-free flaw was found in the way the MIT Kerberos KDC handled initial authentication requests (AS-REQ), when the KDC was configured to provide the PKINIT capability. A remote attacker could use this flaw to cause the KDC daemon to abort by using a specially crafted AS-REQ request. (CVE-2011-0284)

All krb5 users should upgrade to these updated packages, which contain a backported patch to correct this issue. After installing the updated packages, the krb5kdc daemon will be restarted automatically.

Solution

Update the affected packages.

See Also

https://access.redhat.com/security/cve/cve-2011-0284

http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2011-003.txt

https://access.redhat.com/errata/RHSA-2011:0356

Plugin Details

Severity: High

ID: 52700

File Name: redhat-RHSA-2011-0356.nasl

Version: 1.27

Type: local

Agent: unix

Published: 3/17/2011

Updated: 1/14/2021

Supported Sensors: Frictionless Assessment Agent, Frictionless Assessment AWS, Frictionless Assessment Azure

Risk Information

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: High

Base Score: 7.6

Temporal Score: 5.6

Vector: AV:N/AC:H/Au:N/C:C/I:C/A:C

Temporal Vector: E:U/RL:OF/RC:C

Vulnerability Information

CPE: p-cpe:/a:redhat:enterprise_linux:krb5-debuginfo, p-cpe:/a:redhat:enterprise_linux:krb5-devel, p-cpe:/a:redhat:enterprise_linux:krb5-libs, p-cpe:/a:redhat:enterprise_linux:krb5-pkinit-openssl, p-cpe:/a:redhat:enterprise_linux:krb5-server, p-cpe:/a:redhat:enterprise_linux:krb5-server-ldap, p-cpe:/a:redhat:enterprise_linux:krb5-workstation, cpe:/o:redhat:enterprise_linux:6, cpe:/o:redhat:enterprise_linux:6.0

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

Exploit Ease: No known exploits are available

Patch Publication Date: 3/16/2011

Vulnerability Publication Date: 3/19/2011

Reference Information

CVE: CVE-2011-0284

BID: 46881

RHSA: 2011:0356