Oracle Linux 4 / 5 : exim (ELSA-2011-0153)

Medium Nessus Plugin ID 68180

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VPR Score: 7.4

Synopsis

The remote Oracle Linux host is missing one or more security updates.

Description

From Red Hat Security Advisory 2011:0153 :

Updated exim packages that fix one security issue are now available for Red Hat Enterprise Linux 4 and 5.

The Red Hat Security Response Team has rated this update as having moderate 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.

Exim is a mail transport agent (MTA) developed at the University of Cambridge for use on UNIX systems connected to the Internet.

A privilege escalation flaw was discovered in Exim. If an attacker were able to gain access to the 'exim' user, they could cause Exim to execute arbitrary commands as the root user. (CVE-2010-4345)

This update adds a new configuration file, '/etc/exim/trusted-configs'. To prevent Exim from running arbitrary commands as root, Exim will now drop privileges when run with a configuration file not listed as trusted. This could break backwards compatibility with some Exim configurations, as the trusted-configs file only trusts '/etc/exim/exim.conf' and '/etc/exim/exim4.conf' by default. If you are using a configuration file not listed in the new trusted-configs file, you will need to add it manually.

Additionally, Exim will no longer allow a user to execute exim as root with the -D command line option to override macro definitions. All macro definitions that require root permissions must now reside in a trusted configuration file.

Users of Exim are advised to upgrade to these updated packages, which contain a backported patch to correct this issue. After installing this update, the exim daemon will be restarted automatically.

Solution

Update the affected exim packages.

See Also

https://oss.oracle.com/pipermail/el-errata/2011-January/001788.html

https://oss.oracle.com/pipermail/el-errata/2011-January/001796.html

Plugin Details

Severity: Medium

ID: 68180

File Name: oraclelinux_ELSA-2011-0153.nasl

Version: 1.9

Type: local

Agent: unix

Published: 2013/07/12

Updated: 2019/10/25

Dependencies: 12634

Risk Information

Risk Factor: Medium

VPR Score: 7.4

CVSS v2.0

Base Score: 6.9

Temporal Score: 5.7

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

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

Vulnerability Information

CPE: p-cpe:/a:oracle:linux:exim, p-cpe:/a:oracle:linux:exim-doc, p-cpe:/a:oracle:linux:exim-mon, p-cpe:/a:oracle:linux:exim-sa, cpe:/o:oracle:linux:4, cpe:/o:oracle:linux:5

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 2011/01/25

Vulnerability Publication Date: 2010/12/14

Exploitable With

Metasploit (Exim4 string_format Function Heap Buffer Overflow)

Reference Information

CVE: CVE-2010-4345

BID: 45341

RHSA: 2011:0153