GLSA-200609-15 : GnuTLS: RSA Signature Forgery

This script is Copyright (C) 2006-2014 Tenable Network Security, Inc.


Synopsis :

The remote Gentoo host is missing one or more security-related
patches.

Description :

The remote host is affected by the vulnerability described in GLSA-200609-15
(GnuTLS: RSA Signature Forgery)

verify.c fails to properly handle excess data in
digestAlgorithm.parameters field while generating a hash when using an
RSA key with exponent 3. RSA keys that use exponent 3 are commonplace.

Impact :

Remote attackers could forge PKCS #1 v1.5 signatures that are signed
with an RSA key, preventing GnuTLS from correctly verifying X.509 and
other certificates that use PKCS.

Workaround :

There is no known workaround at this time.

See also :

http://www.gentoo.org/security/en/glsa/glsa-200609-15.xml

Solution :

All GnuTLS users should update both packages:
# emerge --sync
# emerge --update --ask --verbose '>=net-libs/gnutls-1.4.4'

Risk factor :

Medium / CVSS Base Score : 5.0
(CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:N)

Family: Gentoo Local Security Checks

Nessus Plugin ID: 22459 (gentoo_GLSA-200609-15.nasl)

Bugtraq ID:

CVE ID: CVE-2006-4790