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Home >> Browse Vulnerability Assessment Database >> Gentoo Local Security Checks >> [GLSA-200602-10] GnuPG: Incorrect signature verification

Vulnerability Assessment Details

[GLSA-200602-10] 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-200602-10
(GnuPG: Incorrect signature verification)

Tavis Ormandy of the Gentoo Linux Security Auditing Team
discovered that automated systems relying on the return code of GnuPG
or gpgv to authenticate digital signatures may be misled by malformed
signatures. GnuPG documentation states that a return code of zero (0)
indicates success, however gpg and gpgv may also return zero if no
signature data was found in a detached signature file.

Impact

A possible hacker may be able to bypass authentication in automated
systems relying on the return code of gpg or gpgv to authenticate
digital signatures.

Workaround

There is no known workaround at this time.

References:
http://lists.gnupg.org/pipermail/gnupg-announce/2006q1/000211.html
http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-0455

Solution:
All GnuPG users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=app-crypt/gnupg-1.4.2.1"

Network Security Threat Level: Medium

Networks Security ID:

Vulnerability Assessment Copyright: (C) 2006 Michel Arboi

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