Bug 1330286 – CVE-2016-2808 Mozilla: Write to invalid HashMap entry through JavaScript.watch() (MFSA 2016-47)

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Bug 1330286 - (CVE-2016-2808) CVE-2016-2808 Mozilla: Write to invalid HashMap entry through JavaScript.watch() (MFSA 2016-47)

Summary:	CVE-2016-2808 Mozilla: Write to invalid HashMap entry through JavaScript.watc...

Status:	CLOSED ERRATA

Aliases:	CVE-2016-2808

Product:	Security Response
Classification:	Other
Component:	vulnerability (Show other bugs)
Sub Component:
Version:	unspecified
Hardware:	All Linux

Priority	high Severity high
Target Milestone:	---
Target Release:	---
Assigned To:	Red Hat Product Security
QA Contact:
Docs Contact:

URL:
Whiteboard:	impact=important,public=20160426,repo...
Keywords:	Security

Depends On:
Blocks:	1306172
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Reported:	2016-04-25 15:08 EDT by Siddharth Sharma
Modified:	2016-05-09 00:52 EDT (History)
CC List:	3 users (show)

See Also:
Fixed In Version:
Doc Type:	Bug Fix
Doc Text:
Story Points:	---
Clone Of:
Environment:
Last Closed:	2016-05-09 00:52:47 EDT
Type:	---
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

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External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHSA-2016:0695	normal	SHIPPED_LIVE	Critical: firefox security update	2016-04-26 19:44:33 EDT

Groups: None (edit)

Description Siddharth Sharma 2016-04-25 15:08:14 EDT

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 15:08:22 EDT

Acknowledgments:

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

Comment 2 errata-xmlrpc 2016-04-26 15:45:34 EDT

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

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