Bug 1475240 (CVE-2017-2836)

Summary:	CVE-2017-2836 freerdp: Rdp Client Read Server Proprietary Certificate Denial of Service
Product:	[Other] Security Response	Reporter:	Adam Mariš <amaris>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED WONTFIX	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	mads, negativo17, oholy, pahan, pokorra.mailinglists
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:	2017-08-07 13:59:20 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:	1475245, 1475246, 1475247
Bug Blocks:	1475243

Description Adam Mariš 2017-07-26 09:21:22 UTC

An exploitable denial of service vulnerability exists within the reading of proprietary server certificates in FreeRDP 2.0.0-beta1+android11. A specially crafted challenge packet can cause the program termination leading to a denial of service condition. An attacker can compromise the server or use man in the middle to trigger this vulnerability.

The vulnerability is located in the parsing of proprietary certificates. In this function, the public key is parsed by the FreeRDP library. However the size of the key specified in the server message packet is inferior to 8, the FreeRDP library crashes.

External References:

http://blog.talosintelligence.com/2017/07/vulnerbility-spotlight-freerdp-multiple.html
https://www.talosintelligence.com/vulnerability_reports/TALOS-2017-0338

Comment 1 Adam Mariš 2017-07-26 09:31:44 UTC

Created freerdp tracking bugs for this issue:

Affects: epel-6 [bug 1475247]
Affects: fedora-all [bug 1475246]


Created freerdp1.2 tracking bugs for this issue:

Affects: fedora-all [bug 1475245]

Comment 2 Stefan Cornelius 2017-07-27 14:27:42 UTC

Patch:
https://github.com/FreeRDP/FreeRDP/pull/4055/commits/8292b4558f0684065ce1f58db7783cc426099223

Comment 3 Stefan Cornelius 2017-08-07 13:59:28 UTC

Statement:

Red Hat Product Security has rated this issue as having Low security impact. This issue is not currently planned to be addressed in future updates. For additional information, refer to the Issue Severity Classification: https://access.redhat.com/security/updates/classification/.