A php-pear security update has been released for Debian GNU/Linux 9 LTS to address a vulnerability that allows write operations with Directory Traversal due to inadequate checking of symbolic links.

DLA 2621-1: php-pear security update

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Debian LTS Advisory DLA-2621-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Sylvain Beucler
April 08, 2021   https://wiki.debian.org/LTS
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Package : php-pear
Version : 1:1.10.1+submodules+notgz-9+deb9u3
CVE ID : CVE-2020-36193
Debian Bug : 980428

A vulnerability was discovered in php-pear, which provides core
packages from the PHP Extension and Application Repository. Tar.php in
Archive_Tar allows write operations with Directory Traversal due to
inadequate checking of symbolic links, a related issue to
CVE-2020-28948. An attacker could escalate privileges by overwriting
files outside the extraction directory through a crafted .tar archive.

For Debian 9 stretch, this problem has been fixed in version
1:1.10.1+submodules+notgz-9+deb9u3.

We recommend that you upgrade your php-pear packages.

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

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