-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512

- -------------------------------------------------------------------------
Debian Security Advisory DSA-5588-1                   security@debian.org
https://www.debian.org/security/                     Salvatore Bonaccorso
December 24, 2023                     https://www.debian.org/security/faq
- -------------------------------------------------------------------------

Package        : putty
CVE ID         : CVE-2021-36367 CVE-2023-48795
Debian Bug     : 990901

Fabian Baeumer, Marcus Brinkmann and Joerg Schwenk discovered that the
SSH protocol is prone to a prefix truncation attack, known as the
"Terrapin attack". This attack allows a MITM attacker to effect a
limited break of the integrity of the early encrypted SSH transport
protocol by sending extra messages prior to the commencement of
encryption, and deleting an equal number of consecutive messages
immediately after encryption starts.

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/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/

Mailing list: debian-security-announce@lists.debian.org
-----BEGIN PGP SIGNATURE-----
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qdiJ
-----END PGP SIGNATURE-----