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GENTOO LINUX SECURITY ANNOUNCEMENT 200312-05
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GLSA: 200312-05
Package: app-crypt/gnupg
Summary: GnuPG ElGamal signing keys compromised and
format string vulnerability
Severity: minimal
Gentoo bug: 34504, 35639
Date: 2003-12-12
CVE: CAN-2003-0971, CAN-2003-0978
Exploit: unknown
Affected: <=1.2.3-r4
Fixed: >=1.2.3-r5
DESCRIPTION:
Two flaws have been found in GnuPG 1.2.3.
First, ElGamal signing keys can be compromised. These keys are not
commonly used. Quote from
<http://lists.gnupg.org/pipermail/gnupg-announce/2003q4/000276.html>:
"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."
Second, there is a format string flaw in the 'gpgkeys_hkp' utility
which "would allow a malicious keyserver in the worst case to execute
an arbitrary code on the user's machine." See
<http://www.s-quadra.com/advisories/Adv-20031203.txt> for
details.
SOLUTION:
All users who have created ElGamal signing keys should immediately
revoke them. Then, all Gentoo Linux machines with gnupg installed
should be updated to use gnupg-1.2.3-r5 or higher.
emerge sync
emerge -pv '>=app-crypt/gnupg-1.2.3-r5'
emerge '>=app-crypt/gnupg-1.2.3-r5'
emerge clean
// end
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