An openssl security update has been released for Debian GNU/Linux 9 LTS to address an issue that could result in denial of service via malformed certificates.

DLA 2952-1: openssl security update

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Debian LTS Advisory DLA-2952-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Emilio Pozuelo Monfort
March 17, 2022   https://wiki.debian.org/LTS
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Package : openssl
Version : 1.1.0l-1~deb9u5
CVE ID : CVE-2019-1551 CVE-2022-0778

Tavis Ormandy discovered that the BN_mod_sqrt() function of OpenSSL
could be tricked into an infinite loop. This could result in denial of
service via malformed certificates.

In addition, this update fixes an overflow bug in the x64_64 Montgomery
squaring procedure.

For Debian 9 stretch, these problems have been fixed in version
1.1.0l-1~deb9u5.

We recommend that you upgrade your openssl packages.

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

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