FreeBSD : gnupg -- OpenPGP symmetric encryption vulnerability (8375a73f-01bf-11da-bc08-0001020eed82)

This script is Copyright (C) 2005-2013 Tenable Network Security, Inc.


Synopsis :

The remote FreeBSD host is missing one or more security-related
updates.

Description :

Serge Mister and Robert Zuccherato reports that the OpenPGP protocol
is vulnerable to a cryptographic attack when using symmetric
encryption in an automated way.

David Shaw reports about the impact :

This attack, while very significant from a cryptographic point of
view, is not generally effective in the real world. To be specific,
unless you have your OpenPGP program set up as part of an automated
system to accept encrypted messages, decrypt them, and then provide a
response to the submitter, then this does not affect you at all.

Note that the fix in GnuPG does note completely eliminate the
potential problem :

These patches disable a portion of the OpenPGP protocol that the
attack is exploiting. This change should not be user visible. With the
patch in place, this attack will not work using a public-key encrypted
message. It will still work using a passphrase-encrypted message.

See also :

http://eprint.iacr.org/2005/033
http://lists.gnupg.org/pipermail/gnupg-announce/2005q1/000191.html
http://www.pgp.com/newsroom/ctocorner/openpgp.html
http://www.nessus.org/u?7addd2dc

Solution :

Update the affected packages.

Risk factor :

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

Family: FreeBSD Local Security Checks

Nessus Plugin ID: 19349 (freebsd_pkg_8375a73f01bf11dabc080001020eed82.nasl)

Bugtraq ID:

CVE ID: CVE-2005-0366

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