Bug 1661640 (CVE-2018-1000852)

Summary:	CVE-2018-1000852 freerdp: out of bounds read in drdynvc_process_capability_request
Product:	[Other] Security Response	Reporter:	Laura Pardo <lpardo>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	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:	2019-08-06 13:21:14 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:	1661641, 1661642, 1661643, 1663085, 1663086
Bug Blocks:	1661644

Description Laura Pardo 2018-12-21 20:31:53 UTC

FreeRDP 2.0.0-rc3 contains an out of bounds read vulnerability in drdynvc_process_capability_request function in channels/drdynvc/client/drdynvc_main.c file. To exploit this RDPClient must connect to the rdp server with the echo option. This can lead to a two-byte outbound reading from the client memory.


References:
https://github.com/FreeRDP/FreeRDP/issues/4866 

Upstream Patch:
https://github.com/FreeRDP/FreeRDP/pull/4871/commits/baee520e3dd9be6511c45a14c5f5e77784de1471

Comment 1 Laura Pardo 2018-12-21 20:32:24 UTC

Created freerdp tracking bugs for this issue:

Affects: epel-6 [bug 1661641]
Affects: fedora-28 [bug 1661642]


Created freerdp1.2 tracking bugs for this issue:

Affects: fedora-all [bug 1661643]

Comment 2 Doran Moppert 2019-01-03 05:04:09 UTC

The same memory disclosure seems to be present in freerdp-1.0.2, though it's contained entirely in the drdynvc_process_capability_request function.  There does not seem to be any Availability impact, as it's a small read beyond the end of a heap buffer.

Comment 5 errata-xmlrpc 2019-08-06 12:22:36 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2019:2157 https://access.redhat.com/errata/RHSA-2019:2157

Comment 6 Product Security DevOps Team 2019-08-06 13:21:14 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-2018-1000852