RHEL 5 : krb5 (RHSA-2010:0343)

medium Nessus Plugin ID 46296

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Synopsis

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

Description

Updated krb5 packages that fix one security issue and one bug are now available for Red Hat Enterprise Linux 5.

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).

A use-after-free flaw was discovered in the MIT Kerberos administration daemon, kadmind. A remote, authenticated attacker could use this flaw to crash the kadmind daemon. Administrative privileges are not required to trigger this flaw, as any realm user can request information about their own principal from kadmind. (CVE-2010-0629)

This update also fixes the following bug :

* when a Kerberos client seeks tickets for use with a service, it must contact the Key Distribution Center (KDC) to obtain them. The client must also determine which realm the service belongs to and it typically does this with a combination of client configuration detail, DNS information and guesswork.

If the service belongs to a realm other than the client's, cross-realm authentication is required. Using a combination of client configuration and guesswork, the client determines the trust relationship sequence which forms the trusted path between the client's realm and the service's realm. This may include one or more intermediate realms.

Anticipating the KDC has better knowledge of extant trust relationships, the client then requests a ticket from the service's KDC, indicating it will accept guidance from the service's KDC by setting a special flag in the request. A KDC which recognizes the flag can, at its option, return a ticket-granting ticket for the next realm along the trust path the client should be following.

If the ticket-granting ticket returned by the service's KDC is for use with a realm the client has already determined was in the trusted path, the client accepts this as an optimization and continues. If, however, the ticket is for use in a realm the client is not expecting, the client responds incorrectly: it treats the case as an error rather than continuing along the path suggested by the service's KDC.

For this update, the krb5 1.7 modifications which allow the client to trust such KDCs to send them along the correct path, resulting in the client obtaining the tickets it originally desired, were backported to krb 1.6.1 (the version shipped with Red Hat Enterprise Linux 5.5).
(BZ#578540)

All krb5 users should upgrade to these updated packages, which contain backported patches to correct these issues. All running KDC services must be restarted for the update to take effect.

Solution

Update the affected packages.

Plugin Details

Severity: Medium

ID: 46296

File Name: redhat-RHSA-2010-0343.nasl

Version: 1.18

Type: local

Agent: unix

Family: Red Hat Local Security Checks

Published: 5/11/2010

Updated: 1/14/2021

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

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Medium

Base Score: 4

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

Vulnerability Information

CPE: p-cpe:/a:redhat:enterprise_linux:krb5-devel, p-cpe:/a:redhat:enterprise_linux:krb5-libs, p-cpe:/a:redhat:enterprise_linux:krb5-server, p-cpe:/a:redhat:enterprise_linux:krb5-workstation, cpe:/o:redhat:enterprise_linux:5

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

Patch Publication Date: 4/6/2010

Vulnerability Publication Date: 4/7/2010

Reference Information

CVE: CVE-2010-0629

RHSA: 2010:0343

Detections

Analytics