Debian DSA-3888-1 Exim4 Memory Leak Mitigated: Update Required

The Qualys Research Labs discovered a memory leak in the Exim mail
transport agent. This is not a security vulnerability in Exim by itself,
but can be used to exploit a vulnerability in stack handling. For the
full details, please refer to their advisory published at:
https://https://www.qualys.com/2017/06/19/stack-clash/stack-clash.txt

For the oldstable distribution (jessie), this problem has been fixed
in version 4.84.2-2+deb8u4.

For the stable distribution (stretch), this problem has been fixed in
version 4.89-2+deb9u1.

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

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: https://www.debian.org/security/