RHEL 5 / 6 : openswan (RHSA-2011:1422)

Medium Nessus Plugin ID 56698


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


Updated openswan packages that fix one security issue are now available for Red Hat Enterprise Linux 5 and 6.

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.

Openswan is a free implementation of Internet Protocol Security (IPsec) and Internet Key Exchange (IKE). IPsec uses strong cryptography to provide both authentication and encryption services.
These services allow you to build secure tunnels through untrusted networks.

A use-after-free flaw was found in the way Openswan's pluto IKE daemon used cryptographic helpers. A remote, authenticated attacker could send a specially crafted IKE packet that would crash the pluto daemon.
This issue only affected SMP (symmetric multiprocessing) systems that have the cryptographic helpers enabled. The helpers are disabled by default on Red Hat Enterprise Linux 5, but enabled by default on Red Hat Enterprise Linux 6. (CVE-2011-4073)

Red Hat would like to thank the Openswan project for reporting this issue. Upstream acknowledges Petar Tsankov, Mohammad Torabi Dashti and David Basin of the information security group at ETH Zurich as the original reporters.

All users of openswan are advised to upgrade to these updated packages, which contain a backported patch to correct this issue.
After installing this update, the ipsec service will be restarted automatically.


Update the affected openswan, openswan-debuginfo and / or openswan-doc packages.

See Also



Plugin Details

Severity: Medium

ID: 56698

File Name: redhat-RHSA-2011-1422.nasl

Version: $Revision: 1.12 $

Type: local

Agent: unix

Published: 2011/11/03

Modified: 2017/01/04

Dependencies: 12634

Risk Information

Risk Factor: Medium


Base Score: 4

Temporal Score: 3.3

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

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

Vulnerability Information

CPE: p-cpe:/a:redhat:enterprise_linux:openswan, p-cpe:/a:redhat:enterprise_linux:openswan-debuginfo, p-cpe:/a:redhat:enterprise_linux:openswan-doc, cpe:/o:redhat:enterprise_linux:5, cpe:/o:redhat:enterprise_linux:6, cpe:/o:redhat:enterprise_linux:6.1

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 2011/11/02

Reference Information

CVE: CVE-2011-4073

BID: 50440

OSVDB: 76725

RHSA: 2011:1422