Bug 1157955

Summary:	mod_auth_mellon: predictable session cookie in rare cases
Product:	[Other] Security Response	Reporter:	Murray McAllister <mmcallis>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	jrusnack, security-response-team, ssorce, vdanen
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:	2014-11-04 01:37:12 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:	1157958, 1157959
Bug Blocks:	1157286

Description Murray McAllister 2014-10-28 06:09:56 UTC

It was reported that users could receive a predictable session cookie in some cases. This would typically only occur if the server was under very high memory pressure. This could be used to hijack another user's session.

Acknowledgements:

Red Hat would like to thank the mod_auth_mellon team for reporting this issue.

Comment 2 Murray McAllister 2014-11-04 01:35:33 UTC

CVE-2014-8566 is not the correct CVE for this issue. In fact, this issue did not receive a CVE, and is related to the following:

https://github.com/UNINETT/mod_auth_mellon/commit/47a767d5f37d1d3a1c004abbf8bb80d1b7eab328

http://jbp.io/2014/01/16/openssl-rand-api/#recommendations-and-patches

It was decided that this could not be used for an attack to force a predictable session cookie to be used.

Comment 3 Murray McAllister 2014-11-04 01:37:12 UTC

This bug may be fixed in a future, upstream mod_auth_mellon release. Closing for now.