Bug 1330286 (CVE-2016-2808)

Summary:	CVE-2016-2808 Mozilla: Write to invalid HashMap entry through JavaScript.watch() (MFSA 2016-47)
Product:	[Other] Security Response	Reporter:	Siddharth Sharma <sisharma>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	jhorak, security-response-team, stransky
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:	2016-05-09 04:52:47 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:
Bug Blocks:	1306172

Description Siddharth Sharma 2016-04-25 19:08:14 UTC

The CESG, the Information Security Arm of GCHQ, reported that the JavaScript .watch() method could be used to overflow the 32-bit generation count of the underlying HashMap, resulting in a write to an invalid entry. Under the right conditions this write could lead to arbitrary code execution. The overflow takes considerable time and a malicious page would require a user to keep it open for the duration of the attack. 

External Reference:

https://www.mozilla.org/security/announce/2016/mfsa2016-47.html

Comment 1 Siddharth Sharma 2016-04-25 19:08:22 UTC

Acknowledgments:

Name: the Mozilla project
Upstream: CESG (the Information Security Arm of GCHQ)

Comment 2 errata-xmlrpc 2016-04-26 19:45:34 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7
  Red Hat Enterprise Linux 6
  Red Hat Enterprise Linux 5

Via RHSA-2016:0695 https://rhn.redhat.com/errata/RHSA-2016-0695.html