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Family: Red Hat Local Security Checks --> Category: infos

RHSA-2005-025: exim Vulnerability Scan

Vulnerability Scan Summary
Check for the version of the exim packages

Detailed Explanation for this Vulnerability Test

Updated exim packages that resolve security issues are now available for
Red Hat Enterprise Linux 4.

This update has been rated as having moderate security impact by the Red
Hat Security Response Team.

Exim is a mail transport agent (MTA) developed at the University of
Cambridge for use on Unix systems connected to the Internet.

A buffer overflow was discovered in the spa_base64_to_bits function in
Exim, as originally obtained from Samba code. If SPA authentication is
enabled, a remote attacker may be able to exploit this vulnerability to
execute arbitrary code as the 'exim' user. The Common Vulnerabilities and
Exposures project ( has assigned the name CVE-2005-0022 to
this issue. Please note that SPA authentication is not enabled by default
in Red Hat Enterprise Linux 4.

Buffer overflow flaws were discovered in the host_aton and
dns_build_reverse functions in Exim. A local user can trigger these flaws
by executing exim with carefully crafted command line arguments and may be
able to gain the rights of the 'exim' account. The Common
Vulnerabilities and Exposures project ( has assigned the name
CVE-2005-0021 to this issue.

Users of Exim are advised to update to these erratum packages which contain
backported patches to correct these issues.

Solution :
Threat Level: High

Click HERE for more information and discussions on this network vulnerability scan.


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