Bug 1985216 (CVE-2021-36367)

Summary:	CVE-2021-36367 putty: weak ssh authentication procedure may lead to credentials disclosure
Product:	[Other] Security Response	Reporter:	Marian Rehak <mrehak>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED UPSTREAM	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	fedora, jskarvad, olysonek-foss
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-07-23 09:54:43 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1985217, 1985218
Bug Blocks:

Description Marian Rehak 2021-07-23 07:52:43 UTC

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).

https://www.chiark.greenend.org.uk/~sgtatham/putty/changes.html
https://git.tartarus.org/?p=simon/putty.git;a=commit;h=1dc5659aa62848f0aeb5de7bd3839fecc7debefa

Comment 1 Marian Rehak 2021-07-23 07:53:02 UTC

Created putty tracking bugs for this issue:

Affects: epel-all [bug 1985218]
Affects: fedora-all [bug 1985217]

Comment 2 Product Security DevOps Team 2021-07-23 09:54:43 UTC

This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.