An openssl1.0 security update has been released for Debian GNU/Linux 9 LTS to address two issues in the OpenSSL cryptographic system.

DLA 2565-1: openssl1.0 security update

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Debian LTS Advisory DLA-2565-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Chris Lamb
February 18, 2021   https://wiki.debian.org/LTS
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Package : openssl1.0
Version : 1.0.2u-1~deb9u4
CVE IDs : CVE-2021-23840 CVE-2021-23841

It was discovered that there were two issues in the 1.0 branch of the
OpenSSL cryptographic system:

* CVE-2021-23840: Prevent an issue where "Digital EnVeloPe"
EVP-related calls could cause applications to behave incorrectly
or even crash.

* CVE-2021-23841: Prevent an issue in the X509 certificate
handling caused by the lack of error handling whilst parsing
"issuer" fields.

For Debian 9 "Stretch", these problems have been fixed in version
1.0.2u-1~deb9u4. For the equivalent changes for the 1.1 branch of
OpenSSL, please see DLA-2563-1.

We recommend that you upgrade your openssl1.0 packages.

For the detailed security status of openssl1.0 please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/openssl1.0

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