GLSA-200405-07 : Exim verify=header_syntax buffer overflow

This script is Copyright (C) 2004-2014 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-200405-07
(Exim verify=header_syntax buffer overflow)

When the option 'verify = header_syntax' is used in an ACL in the
configuration file, Exim is vulnerable to a buffer overflow attack that can
be triggered remotely by sending malicious headers in an email message.
Note that this option is not enabled in Exim's default configuration file.

Impact :

This vulnerability can be exploited to trigger a denial of service attack
and potentially execute arbitrary code with the rights of the user used by
the Exim daemon (by default this is the 'mail' user in Gentoo Linux).

Workaround :

Make sure the verify=header_syntax option is not used in your exim.conf
file.

See also :

http://www.gentoo.org/security/en/glsa/glsa-200405-07.xml

Solution :

All users of Exim should upgrade to the latest stable version:
# emerge sync
# emerge -pv '>=mail-mta/exim-4.33-r1'
# emerge '>=mail-mta/exim-4.33-r1'

Risk factor :

High / CVSS Base Score : 7.5
(CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P)

Family: Gentoo Local Security Checks

Nessus Plugin ID: 14493 (gentoo_GLSA-200405-07.nasl)

Bugtraq ID:

CVE ID: CVE-2004-0400