CVE-2021-36367

high

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).

References

https://www.debian.org/security/2023/dsa-5588

https://www.chiark.greenend.org.uk/~sgtatham/putty/changes.html

https://lists.debian.org/debian-lts-announce/2024/04/msg00016.html

https://git.tartarus.org/?p=simon/putty.git%3Ba=commit%3Bh=1dc5659aa62848f0aeb5de7bd3839fecc7debefa

Details

Source: Mitre, NVD

Published: 2021-07-09

Updated: 2024-07-03

Risk Information

CVSS v2

Base Score: 5.8

Vector: CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:N

Severity: Medium

CVSS v3

Base Score: 8.1

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

Severity: High