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Debian LTS Advisory DLA-2761-1 debian-lts@lists.debian.org
https://www.debian.org/lts/security/ Sylvain Beucler
September 18, 2021 https://wiki.debian.org/LTS
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Package : openssl1.0
Version : 1.0.2u-1~deb9u5
The legacy 1.0 version of OpenSSL, a cryptography library for secure
communication, fails to validate alternate trust chains in some
conditions. In particular this breaks connecting to servers that use
Let's Encrypt certificates, starting 2021-10-01.
For Debian 9 stretch, this problem has been fixed in version
1.0.2u-1~deb9u5.
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:
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