Protect yourself against future threats.
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AUSCERT External Security Bulletin Redistribution
ESB-2021.3142
gnutls28 alternate chains verification
20 September 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: gnutls28
Publisher: Debian
Operating System: Debian GNU/Linux
Windows
UNIX variants (UNIX, Linux, OSX)
Impact/Access: Denial of Service -- Unknown/Unspecified
Resolution: Patch/Upgrade
Original Bulletin:
https://www.debian.org/lts/security/2021/dla-2759
Comment: This advisory references vulnerabilities in products which run on
platforms other than Debian. It is recommended that administrators
running gnutls28 check for an updated version of the software for
their operating system.
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Debian LTS Advisory DLA-2759-1 debian-lts@lists.debian.org
https://www.debian.org/lts/security/ Sylvain Beucler
September 17, 2021 https://wiki.debian.org/LTS
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Package : gnutls28
Version : 3.5.8-5+deb9u6
Debian Bug : 961889
GnuTLS, a portable cryptography library, 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
3.5.8-5+deb9u6.
We recommend that you upgrade your gnutls28 packages.
For the detailed security status of gnutls28 please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/gnutls28
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
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