An Exim4 security update has been released for Debian GNU/Linux

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Debian Security Advisory DSA-2236-1 security@debian.org
http://www.debian.org/security/ Florian Weimer
May 12, 2011 http://www.debian.org/security/faq
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Package : exim4
Vulnerability : command injection
Problem type : remote
Debian-specific: no
CVE ID : CVE-2011-1407

It was discovered that Exim, Debian's default mail transfer agent, is
vulnerable to command injection attacks in its DKIM processing code,
leading to arbitrary code execution. (CVE-2011-1407)

The default configuration supplied by Debian does not expose this
vulnerability.

The oldstable distribution (lenny) is not affected by this problem.

For the stable distribution (squeeze), this problem has been fixed in
version 4.72-6+squeeze2.

For the unstable distribution (sid), this problem has been fixed in
version 4.76-1.

We recommend that you upgrade your exim4 packages.

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: http://www.debian.org/security/