KLA10759 Multiple vulnerabilities in Mozilla Firefox and Firefox ESR

Multiple serious vulnerabilities have been found in Firefox. Malicious users can exploit these vulnerabilities to cause denial of service, execute arbitrary code, bypass security restrictions or obtain sensitive information.

Below is a complete list of vulnerabilities

1. Lack of requests interception restrictions at NPAPI plugins can be exploited remotely via network traffic manipulations to bypass security restrictions; (Firefox only)
2. Obsolete version of Graphite 2 library can be exploited remotely via a specially designed “smart font” to cause denial of service, execute arbitrary code or obtain sensitive information.

Technical details

Vulnerability (1) caused by service workers which intercepts responses to plugin network requests made through browser.

Vulnerability (2) related to multiple Libgraphit vulnerabilities listed below:

1. TtfUtil:LocaLookup function in TtfUtil.cpp incorrectly validates size value and can be exploited remotely to cause denial of service;
2. SillMap::readFace function in FeatureMap.cpp mishandles return value and can be exploited remotely to cause denial of service;
3. Code.cpp does not consider recursive calls and can be exploited remotely to cause denial of service or execute arbitrary code;
4. directrun function in directmachine.cpp does not validate certain skip operations and can be exploited remotely to cause denial of service, execute arbitrary code or obtain sensitive information.

Obsolete version of Graphite was updated at Firefox ESR 38.6.1 and Firefox 43.0.

Original advisories

Mozilla advisory

Mozilla advisory

Related products

Mozilla-Firefox

Mozilla-Firefox-ESR

CVE list

CVE-2016-1523 warning

CVE-2016-1522 critical

CVE-2016-1521 high

CVE-2016-1949 high

CVE-2016-1526 high

Solution

Update to the latest versionGet Firefox

Get Firefox ESR

Impacts

• ACE

Arbitrary code execution. Exploitation of vulnerabilities with this impact can lead to executing by abuser any code or commands at vulnerable machine or process.

• OSI

Obtain sensitive information. Exploitation of vulnerabilities with this impact can lead to capturing by abuser information, critical for user or system.

• DoS

Denial of service. Exploitation of vulnerabilities with this impact can lead to loss of system availability or critical functional fault.

• SB

Security bypass. Exploitation of vulnerabilities with this impact can lead to performing actions restricted by current security settings.

• SUI

Spoof user interface. Exploitation of vulnerabilities with this impact can lead to changes in user interface to beguile user into inaccurate behavior.

Affected Products

• Mozilla Firefox versions earlier than 44.0.2Mozilla Firefox ESR versions ealrier than 38.6.1