An apr security update has been released for Debian GNU/Linux 9 LTS to address an out of bounds memory access issue.

DLA 2897-1: apr security update

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Debian LTS Advisory DLA-2897-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Thorsten Alteholz
January 24, 2022   https://wiki.debian.org/LTS
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Package : apr
Version : 1.5.2-5+deb9u1
CVE ID : CVE-2017-12613

An issue has been found in apr, the Apache Portable Runtime Library.
The issue is related to out of bounds memory access due to invalid date
fields.

For Debian 9 stretch, this problem has been fixed in version
1.5.2-5+deb9u1.

We recommend that you upgrade your apr packages.

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

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