Bug 1438700 (CVE-2017-7394)

Summary:	CVE-2017-7394 tigervnc: Server crash via long usernames
Product:	[Other] Security Response	Reporter:	Andrej Nemec <anemec>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	bphinz, jgrulich, slawomir, twaugh
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:	A missing input sanitization flaw was found in the way TigerVNC handled credentials. A remote unauthenticated attacker could use this flaw to make Xvnc crash by sending specially crafted usernames, resulting in denial of service.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-06-08 03:09:52 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:	1438704, 1438737
Bug Blocks:	1415638, 1438705

Description Andrej Nemec 2017-04-04 08:45:51 UTC

In TigerVNC (SSecurityPlain.cxx SSecurityPlain::processMsg), unauthenticated users can crash the server by sending long usernames. 

Upstream patches:

https://github.com/TigerVNC/tigervnc/pull/440/commits/62197c89e98be47a174074e4c7429c57767a4929
https://github.com/TigerVNC/tigervnc/pull/440/commits/9801c5efcf8c1774d9c807ebd5d27ac7049ad993

Comment 1 Andrej Nemec 2017-04-04 08:54:30 UTC

Created tigervnc tracking bugs for this issue:

Affects: fedora-all [bug 1438704]

Comment 4 errata-xmlrpc 2017-08-01 20:51:50 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2017:2000 https://access.redhat.com/errata/RHSA-2017:2000