A libntlm security update has been released for Debian GNU/Linux 8 LTS.

DLA 2207-1: libntlm security update

Package : libntlm
Version : 1.4-3+deb8u1
CVE ID : CVE-2019-17455

It was discovered that libntlm through 1.5 relies on a fixed buffer
size for tSmbNtlmAuthRequest, tSmbNtlmAuthChallenge, and
tSmbNtlmAuthResponse
read and write operations, as demonstrated by a stack-based buffer
over-read in buildSmbNtlmAuthRequest in smbutil.c for a crafted NTLM
request.

For Debian 8 "Jessie", this problem has been fixed in version
1.4-3+deb8u1.

We recommend that you upgrade your libntlm packages.

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS