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Home >> Browse Vulnerability Assessment Database >> Gentoo Local Security Checks >> [GLSA-200603-08] GnuPG: Incorrect signature verification

Vulnerability Assessment Details

[GLSA-200603-08] GnuPG: Incorrect signature verification

Vulnerability Assessment Summary
GnuPG: Incorrect signature verification

Detailed Explanation for this Vulnerability Assessment
The remote host is affected by the vulnerability described in GLSA-200603-08
(GnuPG: Incorrect signature verification)

OpenPGP is the standard that defines the format of digital
signatures supported by GnuPG. OpenPGP signatures consist of multiple
sections, in a strictly defined order. Tavis Ormandy of the Gentoo
Linux Security Audit Team discovered that certain illegal signature
formats could permit signed data to be modified without detection. GnuPG
has previously attempted to be lenient when processing malformed or
legacy signature formats, but this has now been found to be insecure.

Impact

A remote attacker may be able to construct or modify a
digitally-signed message, potentially permiting them to bypass
authentication systems, or impersonate another user.

Workaround

There is no known workaround at this time.

References:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-0049
http://lists.gnupg.org/pipermail/gnupg-announce/2006q1/000216.html

Solution:
All GnuPG users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=app-crypt/gnupg-1.4.2.2"

Network Security Threat Level: Medium

Networks Security ID:

Vulnerability Assessment Copyright: (C) 2006 Michel Arboi

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