All I know at the moment comes from the vulnerability announcement that
Qualys posted this afternoon. Quote:
The Exim mail server is exploitable remotely if configured to perform
extra security checks on the HELO and EHLO commands ("helo_verify_hosts"
or "helo_try_verify_hosts" option, or "verify = helo" ACL); we developed
a reliable and fully-functional exploit that bypasses all existing
protections (ASLR, PIE, NX) on 32-bit and 64-bit machines.
http://www.openwall.com/lists/oss-security/2015/01/27/9
Tony.
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