Bug 1985216 (CVE-2021-36367) - CVE-2021-36367 putty: weak ssh authentication procedure may lead to credentials disclosure
Summary: CVE-2021-36367 putty: weak ssh authentication procedure may lead to credentia...
Keywords:
Status: CLOSED UPSTREAM
Alias: CVE-2021-36367
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1985217 1985218
Blocks:
TreeView+ depends on / blocked
 
Reported: 2021-07-23 07:52 UTC by Marian Rehak
Modified: 2021-07-23 09:54 UTC (History)
3 users (show)

Fixed In Version:
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Last Closed: 2021-07-23 09:54:43 UTC

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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.
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