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Family: Gentoo Local Security Checks --> Category: infos
[GLSA-200405-07] Exim verify=header_syntax buffer overflow Vulnerability Scan
Vulnerability Scan Summary
Exim verify=header_syntax buffer overflow
Detailed Explanation for this Vulnerability Test
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"
Threat Level: High
Click HERE for more information and discussions on this network vulnerability scan.
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