Vulnerability Assessment & Network Security Forums
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 package
Detailed Explanation for this Vulnerability Assessment
The remote host is missing the patch for the advisory MDKSA-2003:109 (gnupg).
A severe vulnerability was discovered in GnuPG by Phong Nguyen relating to
ElGamal sign+encrypt keys. From Werner Koch's email message:
'Phong Nguyen identified a severe bug in the way GnuPG creates and uses ElGamal
keys for signing. This is a significant security failure which can lead to a
compromise of almost all ElGamal keys used for signing. Note that this is a real
world vulnerability which will reveal your private key within a few seconds.
Please *take immediate action and revoke your ElGamal signing keys*. Furthermore
you should take whatever measures necessary to limit the damage done for signed
or encrypted documents using that key.'
'Note that the standard keys as generated by GnuPG (DSA and ElGamal encryption)
as well as RSA keys are NOT vulnerable. Note also that ElGamal signing keys
cannot be generated without the use of a special flag to enable hidden options
and even then overriding a warning message about this key type. See below for
details on how to identify vulnerable keys.'
MandrakeSoft urges any users who use the ElGamal sign+encrypt keys to
immediately revoke these keys and discontinue use of them. Updated packages are
provided that remove the ability to create these keys and to create signatures
using these keys (thanks to David Shaw for writing the patch).
Solution : http://wwwnew.mandriva.com/security/advisories?name=MDKSA-2003:109
Network Security Threat Level: High
Networks Security ID: 9115
Vulnerability Assessment Copyright: This script is Copyright (C) 2004 Tenable Network Security
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