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If through a vulnerability assessment, a network security issue is detected for the vulnerability below, applying the appropriate security patches in a timely matter is very important. If you have detected that your system has already been compromised, following CERT's Network Security recovery document will assist with recommended steps for system recovery.
Vulnerability Assessment Details
Check for the version of the gnupg packages
Detailed Explanation for this Vulnerability Assessment
An updated GnuPG package that fixes signature verification flaws as well as
minor bugs is now available.
This update has been rated as having important security impact by the Red
Hat Security Response Team.
GnuPG is a utility for encrypting data and creating digital signatures.
Tavis Ormandy discovered a bug in the way GnuPG verifies cryptographically
signed data with detached signatures. It is possible for a possible hacker to
construct a cryptographically signed message which could appear to come
from a third party. When a victim processes a GnuPG message with a
malformed detached signature, GnuPG ignores the malformed signature,
processes and outputs the signed data, and exits with status 0, just as it
would if the signature had been valid. In this case, GnuPG's exit status
would not indicate that no signature verification had taken place. This
issue would primarily be of concern when processing GnuPG results via an
automated script. The Common Vulnerabilities and Exposures project assigned
the name CVE-2006-0455 to this issue.
Tavis Ormandy also discovered a bug in the way GnuPG verifies
cryptographically signed data with inline signatures. It is possible for an
attacker to inject unsigned data into a signed message in such a way that
when a victim processes the message to recover the data, the unsigned data
is output along with the signed data, gaining the appearance of having been
signed. This issue is mitigated in the GnuPG shipped with Red Hat
Enterprise Linux as the --ignore-crc-error option must be passed to the gpg
executable for this attack to be successful. The Common Vulnerabilities and
Exposures project assigned the name CVE-2006-0049 to this issue.
Please note that neither of these issues affect the way RPM or up2date
verify RPM package files, nor is RPM vulnerable to either of these issues.
All users of GnuPG are advised to upgrade to this updated package, which
contains backported patches to correct these issues.
Solution : http://rhn.redhat.com/errata/RHSA-2006-0266.html
Network Security Threat Level: High
Networks Security ID:
Vulnerability Assessment Copyright: This script is Copyright (C) 2006 Tenable Network Security
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