Multiple Vulnerabilities in Mozilla Firefox Could Allow for Remote Code Execution

ITS Advisory Number: 
2018-030
Date(s) Issued: 
Monday, March 19, 2018
Subject: 
Multiple Vulnerabilities in Mozilla Firefox Could Allow for Remote Code Execution
Overview: 

Multiple vulnerabilities have been discovered in Mozilla Firefox and Firefox Extended Support Release (ESR), which could allow for remote code execution. Mozilla Firefox is a web browser used to access the Internet. Mozilla Firefox ESR is a version of the web browser intended to be deployed in large organizations. Successful exploitation of these vulnerabilities could allow for remote code execution. Depending on the privileges associated with the user, an attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. Users whose accounts are configured to have fewer user rights on the system could be less impacted than those who operate with administrative user rights.

THREAT INTELLIGENCE: There are currently no reports of these vulnerabilities being exploited in the wild.

Systems Affected: 
  •     Mozilla Firefox versions prior to 59.0.1
  •     Mozilla Firefox ESR versions prior to 52.7.2
RISK
GOVERNMENT
Large and medium government entities: 
High
Small government entities: 
Medium
BUSINESS
Large and medium business entities: 
High
Small business entities: 
Medium
Home Users: 
Low
Description: 

Multiple vulnerabilities have been discovered in Mozilla Firefox and Firefox Extended Support Release (ESR), which could allow for remote code execution. Details of the vulnerabilities are as follows:

  • A remote code-execution vulnerability exists because it fails to properly process Vorbis audio data. Specifically, this issue occurs due to an out-of-bounds write error in the 'libvorbis' library. (CVE-2018-5146)
  • A remote code-execution vulnerability exists because it fails to properly process Vorbis audio data. Specifically, this issue occurs due to an out-of-bounds write error in the 'libtremor' library. (CVE-2018-5147)

Successful exploitation of these vulnerabilities could allow for remote code execution. Depending on the privileges associated with the user, an attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. Users whose accounts are configured to have fewer user rights on the system could be less impacted than those who operate with administrative user rights.

 

Actions: 
  • After appropriate testing, immediately install the updates provided by Mozilla to vulnerable systems.
  • Run all software as a non-privileged user (one without administrative privileges) to diminish the effects of a successful attack.
  • Remind users not to visit un-trusted websites or follow links provided by unknown or un-trusted sources.
  • Inform and educate users regarding the threats posed by hypertext links contained in emails or attachments especially from un-trusted sources.
  • Apply the Principle of Least Privilege to all systems and services.