Bug 1549172 (CVE-2018-7226)

Summary:	CVE-2018-7226 libvncserver: integer overflow in vcSetXCutTextProc in VNConsole.c
Product:	[Other] Security Response	Reporter:	Laura Pardo <lpardo>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	negativo17, ppisar, rdieter
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:	2018-04-03 08:09:04 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:	1549173, 1549174
Bug Blocks:	1546862

Description Laura Pardo 2018-02-26 15:32:26 UTC

An issue was discovered in vcSetXCutTextProc() in VNConsole.c in LinuxVNC and VNCommand from the LibVNC/vncterm distribution through 0.9.10. Missing sanitization of the client-specified message length may cause integer overflow or possibly have unspecified other impact via a specially crafted VNC packet.


References:
https://github.com/LibVNC/vncterm/issues/6
http://openwall.com/lists/oss-security/2018/02/18/2

Comment 1 Laura Pardo 2018-02-26 15:32:58 UTC

Created libvncserver tracking bugs for this issue:

Affects: epel-7 [bug 1549173]
Affects: fedora-all [bug 1549174]

Comment 2 Stefan Cornelius 2018-04-03 08:09:04 UTC

vncterm is not shipped as part of our RHEL6/7 packages.

Comment 3 Stefan Cornelius 2018-04-03 08:09:14 UTC

Statement:

This issue did not affect the versions of libvncserver as shipped with Red Hat Enterprise Linux 6 and 7.