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, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub advisories/code/issues, web search, more)
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
	bullseye	0.74-1	vulnerable
	bookworm, sid	0.78-2	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
putty	source	(unstable)	0.75-3			990901

Notes

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