RHSA-2007:0107 - Security Advisory

Topic

Updated GnuPG packages that fix a security issue are now available for Red
Hat Enterprise Linux 5.

This update has been rated as having important security impact by the Red
Hat Security Response Team.

Description

GnuPG is a utility for encrypting data and creating digital signatures.

Gerardo Richarte discovered that a number of applications that make use of
GnuPG are prone to a vulnerability involving incorrect verification of
signatures and encryption. An attacker could add arbitrary content to a
signed message in such a way that a receiver of the message would not be
able to distinguish between the properly signed parts of a message and the
forged, unsigned, parts. (CVE-2007-1263)

Whilst this is not a vulnerability in GnuPG itself, the GnuPG team have
produced a patch to protect against messages with multiple plaintext
packets. Users should update to these erratum packages which contain the
backported patch for this issue.

Red Hat would like to thank Core Security Technologies for reporting this
issue.

Solution

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

This update is available via Red Hat Network. Details on how to use
the Red Hat Network to apply this update are available at
http://kbase.redhat.com/faq/FAQ_58_10188

Affected Products

• 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 Workstation 5 x86_64
• Red Hat Enterprise Linux Workstation 5 i386
• Red Hat Enterprise Linux Desktop 5 x86_64
• Red Hat Enterprise Linux Desktop 5 i386
• Red Hat Enterprise Linux for IBM z Systems 5 s390x
• Red Hat Enterprise Linux for Power, big endian 5 ppc
• Red Hat Enterprise Linux Server from RHUI 5 x86_64
• Red Hat Enterprise Linux Server from RHUI 5 i386

Fixes

• BZ - 230467 - CVE-2007-1263 gnupg signed message spoofing

CVEs

• CVE-2007-1263

References

• http://www.redhat.com/security/updates/classification/#important