Bug 1835399 (CVE-2020-11045)

Summary:	CVE-2020-11045 freerdp: out of bounds read in update_read_bitmap_data function
Product:	[Other] Security Response	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
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
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	freerdp 2.0.0	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2020-09-29 22:01:01 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:	1835400, 1835401, 1835402, 1836385, 1836386
Bug Blocks:	1835410

Description Guilherme de Almeida Suckevicz 2020-05-13 17:53:06 UTC

In FreeRDP after 1.0 and before 2.0.0, there is an out-of-bound read in in update_read_bitmap_data that allows client memory to be read to an image buffer. The result displayed on screen as colour.

References:
https://github.com/FreeRDP/FreeRDP/issues/6005
https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-3x39-248q-f4q6

Upstream commit:
https://github.com/FreeRDP/FreeRDP/commit/f8890a645c221823ac133dbf991f8a65ae50d637

Comment 1 Guilherme de Almeida Suckevicz 2020-05-13 17:53:29 UTC

Created freerdp tracking bugs for this issue:

Affects: epel-all [bug 1835402]
Affects: fedora-all [bug 1835401]


Created freerdp1.2 tracking bugs for this issue:

Affects: fedora-all [bug 1835400]

Comment 2 Todd Cullum 2020-05-15 18:18:49 UTC

Technical Summary:

update_read_bitmap_data() does not check the length of the stream remaining before reading 8 bytes of data from the stream; thus it is possible to read up to 8 bytes past the end of the stream buffer, when certain bitmap flags are set. The read data will be stored in bitmap metadata size variables.

Comment 4 errata-xmlrpc 2020-09-29 20:43:40 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2020:4031 https://access.redhat.com/errata/RHSA-2020:4031

Comment 5 Product Security DevOps Team 2020-09-29 22:01:01 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-2020-11045

Comment 6 errata-xmlrpc 2020-11-04 02:38:39 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2020:4647 https://access.redhat.com/errata/RHSA-2020:4647