Bug 1344022 (CVE-2016-3100)

Summary:	CVE-2016-3100 kde: world readable Xauthority file exposes cookie credentials
Product:	[Other] Security Response	Reporter:	Adam Mariš <amaris>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED CURRENTRELEASE	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	jgrulich, me, rdieter, than
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
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Fixed In Version:		Doc Type:	If docs needed, set a value
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Last Closed:	2016-06-08 14:28:34 UTC	Type:	---
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Documentation:	---	CRM:
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	1312060

Description Adam Mariš 2016-06-08 14:27:15 UTC

It was found that kdeinit5 creates /tmp/xauth-xxx-_y with inappropriate permission, which are 644 instead of 600. This can be exploited by stealing X11 cookie and running X11 keylogger. Malicious user is able to read key strokes of a different user which might be a sudo user. If attacker can log key events of a sudo user then it can lead to local privilege escalation.

Upstream bugs:

https://bugs.kde.org/show_bug.cgi?id=358593
https://bugs.kde.org/show_bug.cgi?id=363140

Upstream patches:

https://quickgit.kde.org/?p=kinit.git&a=commitdiff&h=dece8fd89979cd1a86c03bcaceef6e9221e8d8cd
https://quickgit.kde.org/?p=kinit.git&a=commitdiff&h=72f3702dbe6cf15c06dc13da2c99c864e9022a58

Comment 1 Adam Mariš 2016-06-08 14:27:26 UTC

Acknowledgments:

Name: Stephan Mueller (Atsec)

Comment 2 Adam Mariš 2016-06-22 07:31:17 UTC

External References:

https://www.kde.org/info/security/advisory-20160621-1.txt