A gssproxy security update has been released for Debian GNU/Linux 9 LTS to address a privilege separation caused by gssproxy not unlocking cond_mutex prior to calling pthread_exit.

DLA 2516-1: gssproxy security update

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Debian LTS Advisory DLA-2516-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Chris Lamb
January 04, 2021   https://wiki.debian.org/LTS
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Package : gssproxy
Version : 0.5.1-2+deb9u1
CVE ID : CVE-2020-12658
Debian Bug : #978931

It was discovered that there was an issue in the gssproxy privilege
separation caused by gssproxy not unlocking cond_mutex prior to
calling pthread_exit.

For Debian 9 "Stretch", this problem has been fixed in version
0.5.1-2+deb9u1.

We recommend that you upgrade your gssproxy packages.

For the detailed security status of gssproxy please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/gssproxy

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