Bug 1852415 (CVE-2020-14002)

Summary:	CVE-2020-14002 putty: Observable Discrepancy leading to an information leak in the algorithm negotiation
Product:	[Other] Security Response	Reporter:	Michael Kaplan <mkaplan>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED UPSTREAM	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	fedora, jima, jskarvad, olysonek, tremble
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	putty 0.74	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2020-06-30 17:20:41 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:	1852416, 1852417, 1852418
Bug Blocks:

Description Michael Kaplan 2020-06-30 11:29:34 UTC

PuTTY 0.68 through 0.73 has an Observable Discrepancy leading to an information leak in the algorithm negotiation. This allows man-in-the-middle attackers to target initial connection attempts (where no host key for the server has been cached by the client).

References:

https://lists.tartarus.org/pipermail/putty-announce/
https://www.chiark.greenend.org.uk/~sgtatham/putty/changes.html
https://www.fzi.de/en/news/news/detail-en/artikel/fsa-2020-2-ausnutzung-eines-informationslecks-fuer-gezielte-mitm-angriffe-auf-ssh-clients/

Comment 1 Michael Kaplan 2020-06-30 11:30:12 UTC

Created putty tracking bugs for this issue:

Affects: epel-6 [bug 1852417]
Affects: epel-7 [bug 1852418]
Affects: fedora-all [bug 1852416]

Comment 2 Product Security DevOps Team 2020-06-30 17:20:41 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.