Bug 1671359 (CVE-2018-8786)

Summary:	CVE-2018-8786 freerdp: Integer truncation leading to heap-based buffer overflow in update_read_bitmap_update() function
Product:	[Other] Security Response	Reporter:	Andrej Nemec <anemec>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	mads, mailinglists, negativo17, oholy, pahan, pokorra.mailinglists
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	freerdp 2.0.0-rc4	Doc Type:	If docs needed, set a value
Doc Text:	A flaw was found in freerdp in versions prior to version 2.0.0-rc4. An integer truncation that leads to a heap-based buffer overflow in the update_read_bitmap_update() function results in a memory corruption. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-06-10 10:46:55 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:	1671370, 1684152, 1684153, 1684154
Bug Blocks:	1671368

Description Andrej Nemec 2019-01-31 13:30:27 UTC

FreeRDP prior to version 2.0.0-rc4 contains an Integer Truncation that leads to a Heap-Based Buffer Overflow in function update_read_bitmap_update() and results in a memory corruption.

Upstream patch:

https://github.com/FreeRDP/FreeRDP/commit/445a5a42c500ceb80f8fa7f2c11f3682538033f3

Comment 1 Andrej Nemec 2019-01-31 13:44:16 UTC

Created freerdp tracking bugs for this issue:

Affects: epel-6 [bug 1671370]

Comment 3 Riccardo Schirone 2019-02-28 15:03:01 UTC

The attacker needs to either hijack the communication between a FreeRDP client and a valid server or he needs to compromise a server for the attack to be successful.

Comment 4 Riccardo Schirone 2019-02-28 15:04:02 UTC

The memory corruption in update_read_bitmap_update() can be used to make the FreeRDP application crash or to execute arbitrary code in the context of the client system.

Comment 8 Riccardo Schirone 2019-02-28 15:09:56 UTC

Created freerdp tracking bugs for this issue:

Affects: fedora-all [bug 1684154]

Comment 9 errata-xmlrpc 2019-04-02 11:37:04 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2019:0697 https://access.redhat.com/errata/RHSA-2019:0697