A subversion security update has been released for Debian GNU/Linux 9 LTS to address a security issue where Subversion's mod_authz_svn module will crash if the server is using in-repository authz rules with the AuthzSVNReposRelativeAccessFile option and a client sends a request for a non-existing repository URL.

DLA 2646-1: subversion security update

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Debian LTS Advisory DLA-2646-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Anton Gladky
May 03, 2021   https://wiki.debian.org/LTS
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Package : subversion
Version : 1.9.5-1+deb9u6
CVE ID : CVE-2020-17525

One security issue has been discovered in subversion:

CVE-2020-17525:

Subversion's mod_authz_svn module will crash if the server is using
in-repository authz rules with the AuthzSVNReposRelativeAccessFile
option and a client sends a request for a non-existing repository URL.
This can lead to disruption for users of the service.

For Debian 9 stretch, this problem has been fixed in version
1.9.5-1+deb9u6.

We recommend that you upgrade your subversion packages.

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

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