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Home >> Browse Vulnerability Assessment Database >> Gentoo Local Security Checks >> [GLSA-200405-07] Exim verify=header_syntax buffer overflow

Vulnerability Assessment Details

[GLSA-200405-07] Exim verify=header_syntax buffer overflow

Vulnerability Assessment Summary
Exim verify=header_syntax buffer overflow

Detailed Explanation for this Vulnerability Assessment
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.

References:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2004-0400

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

Network Security Threat Level: High

Networks Security ID:

Vulnerability Assessment Copyright: (C) 2005 Michel Arboi

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