libspf2 - potential remote code execution

Dan Kaminsky discovered that libspf2, an implementation of the Sender
Policy Framework (SPF) used by mail servers for mail filtering, handles
malformed TXT records incorrectly, leading to a buffer overflow
condition (CVE-2008-2469).

Note that the SPF configuration template in Debian’s Exim configuration
recommends to use libmail-spf-query-perl, which does not suffer from
this issue.

For the stable distribution (etch), this problem has been fixed in
version 1.2.5-4+etch1.

For the testing distribution (lenny), this problem has been fixed in
version 1.2.5.dfsg-5+lenny1.

For the unstable distribution (sid), this problem will be fixed soon.

We recommend that you upgrade your libspf2 package.