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: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED NOTABUG QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: christoph.wickert, rdieter
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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:
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:


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.