Synopsis

Moderate: openswan security update

Type/Severity

Security Advisory: Moderate

Topic

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.

Description

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.

Solution

Before applying this update, make sure all previously-released errata
relevant to your system have been applied.

This update is available via the Red Hat Network. Details on how to
use the Red Hat Network to apply this update are available at
https://access.redhat.com/kb/docs/DOC-11259

Affected Products

• Red Hat Enterprise Linux Server 6 x86_64
• Red Hat Enterprise Linux Server 6 i386
• Red Hat Enterprise Linux Server 5 x86_64
• Red Hat Enterprise Linux Server 5 ia64
• Red Hat Enterprise Linux Server 5 i386
• Red Hat Enterprise Linux Server - Extended Update Support 6.1 x86_64
• Red Hat Enterprise Linux Server - Extended Update Support 6.1 i386
• Red Hat Enterprise Linux Workstation 6 x86_64
• Red Hat Enterprise Linux Workstation 6 i386
• Red Hat Enterprise Linux Workstation 5 x86_64
• Red Hat Enterprise Linux Workstation 5 i386
• Red Hat Enterprise Linux Desktop 6 x86_64
• Red Hat Enterprise Linux Desktop 6 i386
• Red Hat Enterprise Linux Desktop 5 x86_64
• Red Hat Enterprise Linux Desktop 5 i386
• Red Hat Enterprise Linux for IBM z Systems 6 s390x
• Red Hat Enterprise Linux for IBM z Systems 5 s390x
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 6.1 s390x
• Red Hat Enterprise Linux for Power, big endian 6 ppc64
• Red Hat Enterprise Linux for Power, big endian 5 ppc
• Red Hat Enterprise Linux for Power, big endian - Extended Update Support 6.1 ppc64
• Red Hat Enterprise Linux Server from RHUI 6 x86_64
• Red Hat Enterprise Linux Server from RHUI 6 i386
• Red Hat Enterprise Linux Server from RHUI 5 x86_64
• Red Hat Enterprise Linux Server from RHUI 5 i386
• Red Hat Enterprise Linux Server - Extended Update Support from RHUI 6.1 x86_64
• Red Hat Enterprise Linux Server - Extended Update Support from RHUI 6.1 i386
• Red Hat Virtual Storage Appliance (from RHUI) 6.1 x86_64

Fixes

• BZ - 748961 - CVE-2011-4073 openswan: use-after-free vulnerability leads to DoS

CVEs

• CVE-2011-4073

References

• https://access.redhat.com/security/updates/classification/#moderate

Red Hat Enterprise Linux for IBM z Systems 5

SRPM
s390x
openswan-2.6.21-5.el5_7.6.s390x.rpm	SHA-256: bd491428310b39605c021bc0f9745425f9d4ba467bd208ccb732fe7426dea89d
openswan-doc-2.6.21-5.el5_7.6.s390x.rpm	SHA-256: dd75ade86002b32ee0f7750462ea4983faa20ba9452fe2bf51d354c5b2ca8a16