Bug 1852356 (CVE-2017-18922)

Summary:	CVE-2017-18922 libvncserver: websocket decoding buffer overflow
Product:	[Other] Security Response	Reporter:	Stefan Cornelius <scorneli>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	jadahl, mcatanza, mkrajnak, negativo17, rdieter
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	libvncserver 0.9.12	Doc Type:	If docs needed, set a value
Doc Text:	A flaw was found in libvncserver. A heap-based buffer overflow within the websocket decoding functionality is possible, which can lead to exploitation by a malicious attacker to overwrite a function pointer. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2020-08-03 19:27:45 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:	1852505, 1852506, 1852507, 1852508, 1852509, 1852510, 1852511
Bug Blocks:	1849880

Description Stefan Cornelius 2020-06-30 08:54:59 UTC

libvncserver container a heap-based buffer overflow within the websocket decoding functionality, which can be exploited by a malicious attacker to overwrite a function pointer.

Patch:
https://github.com/LibVNC/libvncserver/commit/aac95a9dcf4bbba87b76c72706c3221a842ca433

Comment 3 Stefan Cornelius 2020-06-30 14:56:05 UTC

Created libvncserver tracking bugs for this issue:

Affects: fedora-all [bug 1852511]

Comment 13 errata-xmlrpc 2020-08-03 13:45:22 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2020:3281 https://access.redhat.com/errata/RHSA-2020:3281

Comment 14 Product Security DevOps Team 2020-08-03 19:27:45 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-2017-18922

Comment 15 errata-xmlrpc 2020-08-10 14:17:22 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2020:3385 https://access.redhat.com/errata/RHSA-2020:3385

Comment 16 errata-xmlrpc 2020-08-17 13:13:48 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.1 Extended Update Support

Via RHSA-2020:3456 https://access.redhat.com/errata/RHSA-2020:3456

Comment 17 errata-xmlrpc 2020-09-01 14:53:46 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.0 Update Services for SAP Solutions

Via RHSA-2020:3588 https://access.redhat.com/errata/RHSA-2020:3588