Bug 1690382 (CVE-2019-9894, CVE-2019-9895, CVE-2019-9897, CVE-2019-9898)

Summary:	CVE-2019-9894 CVE-2019-9895 CVE-2019-9898 CVE-2019-9897 putty: multiple vulnerabilities
Product:	[Other] Security Response	Reporter:	Dhananjay Arunesh <darunesh>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED UPSTREAM	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	fedora, jima, jskarvad, olysonek, tremble
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	putty 0.71	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-06-10 10:51:08 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:	1690385, 1690386
Bug Blocks:

Description Dhananjay Arunesh 2019-03-19 11:30:04 UTC

The following security issue has been discovered in putty < 0.71:
  * a remotely triggerable memory overwrite in RSA key exchange, which can occur before host key verification
  * potential recycling of random numbers used in cryptography
  * on Unix, remotely triggerable buffer overflow in any kind of server-to-client forwarding
  * multiple denial-of-service attacks that can be triggered by writing to the terminal 
  * Other security enhancements: major rewrite of the crypto code to remove cache and timing side channels

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

Upstream commit:
https://build.opensuse.org/request/show/685782

Comment 1 Dhananjay Arunesh 2019-03-19 11:32:34 UTC

External References:

https://www.chiark.greenend.org.uk/~sgtatham/putty/releases/0.71.html

Comment 2 Dhananjay Arunesh 2019-03-19 11:39:09 UTC

Created putty tracking bugs for this issue:

Affects: fedora-all [bug 1690385]

Comment 3 Dhananjay Arunesh 2019-03-19 11:39:28 UTC

Created putty tracking bugs for this issue:

Affects: epel-all [bug 1690386]

Comment 4 Dhananjay Arunesh 2019-03-22 09:59:23 UTC

Updated flaw with CVEs:

CVE-2019-9894: 
A remotely triggerable memory overwrite in RSA key exchange in PuTTY before 0.71 can occur before host key verification.

CVE-2019-9895:
In PuTTY versions before 0.71 on Unix, a remotely triggerable buffer overflow exists in any kind of server-to-client forwarding.

CVE-2019-9898:
Potential recycling of random numbers used in cryptography exists within PuTTY before 0.71.

CVE-2019-9897:
Multiple denial-of-service attacks that can be triggered by writing to the terminal exist in PuTTY versions before 0.71.

Comment 5 Product Security DevOps Team 2019-06-10 10:51:08 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.