CVE-2021-36367

Name	CVE-2021-36367
Description	PuTTY through 0.75 proceeds with establishing an SSH session even if it has never sent a substantive authentication response. This makes it easier for an attacker-controlled SSH server to present a later spoofed authentication prompt (that the attacker can use to capture credential data, and use that data for purposes that are undesired by the client user).
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DLA-3794-1
Debian Bugs	990901

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
putty (PTS)	buster	0.70-6	vulnerable
	buster (security)	0.74-1+deb11u1~deb10u1	fixed
	bullseye (security), bullseye	0.74-1+deb11u1	fixed
	bookworm, bookworm (security)	0.78-2+deb12u1	fixed
	sid, trixie	0.81-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Origin	Debian Bugs
putty	source	buster	0.74-1+deb11u1~deb10u1	DLA-3794-1
putty	source	bullseye	0.74-1+deb11u1
putty	source	(unstable)	0.75-3		990901

[stretch] - putty <no-dsa> (Minor issue)
https://git.tartarus.org/?p=simon/putty.git;a=commit;h=1dc5659aa62848f0aeb5de7bd3839fecc7debefa