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Debian bullseye: DSA-5588-1 critical: putty prefix truncation attack

debian
Calendar Grey December 24, 2023
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The Debian Security Advisory DSA-5588-1 addresses critical ssh issues in putty packages related to prefix truncation attacks.
Fabian Baeumer, Marcus Brinkmann and Joerg Schwenk discovered that the SSH protocol is prone to a prefix truncation attack, known as the "Terrapin attack"

Summary

Details can be found at https://terrapin-attack.com/

For the oldstable distribution (bullseye), these problems have been fixed
in version 0.74-1+deb11u1. This update includes a fix for CVE-2021-36367.

For the stable distribution (bookworm), these problems have been fixed in
version 0.78-2+deb12u1.

We recommend that you upgrade your putty packages.

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

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/



Severity
critical
Lowest
Low
Medium
High
Critical

Package: putty
CVE ID: CVE-2021-36367 CVE-2023-48795

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