Bug 1284574 (CVE-2015-8316)

Summary:	CVE-2015-8316 lightdm: XDMCP request packet with no addresses crashes LightDM
Product:	[Other] Security Response	Reporter:	Adam Mariš <amaris>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	christoph.wickert, rdieter
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2016-03-24 14:36:45 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:	1284575
Bug Blocks:

Description Adam Mariš 2015-11-23 15:43:59 UTC

It was found that when XDMCP sercer is enabled and LightDM receives an XDMCP Request packet with no addresses, it will attempt to access a negative index into an array, causing denial of service.

CVE assignment:

http://seclists.org/oss-sec/2015/q4/352

Comment 1 Adam Mariš 2015-11-23 15:44:14 UTC

Created lightdm tracking bugs for this issue:

Affects: fedora-all [bug 1284575]

Comment 2 Rex Dieter 2016-03-24 14:36:45 UTC

per linked fedora bug,

According to the CVE_2015-8316 text, "some versions of LightDM (1.14 and 1.16 series) are vulnerable".

Fedora (and EPEL) ship lightdm-1.10.x, so it would appear we are safe, closing.