Bug 1854871 (CVE-2020-4032)

Summary:	CVE-2020-4032 freerdp: integer casting vulnerability in update_recv_secondary_order
Product:	[Other] Security Response	Reporter:	Dhananjay Arunesh <darunesh>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	mads, negativo17, oholy, pahan, pokorra.mailinglists
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	freerdp 2.1.2	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2020-07-11 01:27:36 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:	1854872, 1854873
Bug Blocks:	1854906

Description Dhananjay Arunesh 2020-07-08 11:49:48 UTC

In FreeRDP before version 2.1.2, there is an integer casting vulnerability in update_recv_secondary_order. All clients with +glyph-cache /relax-order-checks are affected. This is fixed in version 2.1.2.

References:
http://www.freerdp.com/2020/06/22/2_1_2-released
https://github.com/FreeRDP/FreeRDP/commit/e7bffa64ef5ed70bac94f823e2b95262642f5296
https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-3898-mc89-x2vc

Comment 1 Dhananjay Arunesh 2020-07-08 11:51:55 UTC

Created freerdp tracking bugs for this issue:

Affects: epel-all [bug 1854873]
Affects: fedora-all [bug 1854872]

Comment 2 Todd Cullum 2020-07-10 20:12:03 UTC

Mitigation:

Do not run the freerdp client with the +glyph-cache and /relax-order-checks options.

Comment 3 Todd Cullum 2020-07-10 22:01:01 UTC

In libfreerdp/core/orders.c update_recv_secondary_order(), Stream_Seek() was replaced with Stream_SafeSeek() and a length variable computed in reverse order to avoid an incorrect version between numeric types. This flaw affects freerdp CLIENTs only.

Comment 4 Todd Cullum 2020-07-10 22:05:26 UTC

Statement:

This flaw does not affect versions of freerdp as shipped with any version of Red Hat Enterprise Linux as the vulnerable code was introduced in a newer version of freerdp.

Comment 5 Product Security DevOps Team 2020-07-11 01:27:36 UTC

This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2020-4032

Comment 6 Product Security DevOps Team 2020-07-11 07:27:37 UTC

This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2020-4032