Multiple Vulnerabilities in Mozilla Firefox Could Allow for Arbitrary Code Execution

ITS Advisory Number: 
Date(s) Issued: 
Wednesday, March 9, 2016
Multiple Vulnerabilities in Mozilla Firefox Could Allow for Arbitrary Code Execution

Multiple vulnerabilities have been identified in Mozilla Firefox and Firefox ESR, which could allow for arbitrary 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. Exploitation of these issues could allow an attacker to bypass same-origin policy restrictions to access data, and execute arbitrary code in the context of the affected application.

Systems Affected: 
  • Mozilla Firefox versions prior to 45
  • Mozilla Firefox ESR versions prior to 38.7
Large and medium government entities: 
Small government entities: 
Large and medium business entities: 
Small business entities: 
Home Users: 

Mozilla has confirmed multiple vulnerabilities in Firefox and Firefox ESR. Exploitation of these vulnerabilities could allow for arbitrary code execution, bypass the same-origin policy and other security restrictions, and perform unauthorized actions. These vulnerabilities could be exploited if a user visits or is redirected to a specially-crafted webpage or opens a specially-crafted file. Details of these vulnerabilities are as follows:

  • Multiple vulnerabilities in the Graphite 2 "smart font" library could allow for crashing the application (CVE-2016-1977, CVE-2016-2790, CVE-2016-2791, CVE-2016-2792, CVE-2016-2793, CVE-2016-2794, CVE-2016-2795, CVE-2016-2796, CVE-2016-2797, CVE-2016-2798, CVE-2016-2799, CVE-2016-2800, CVE-2016-2801, CVE-2016-2802)
  • Use-after-free vulnerability when processing DER-encoded keys for NSS (CVE-2016-1979)
  • Buffer overflow vulnerability during NSS ASN.1 decoding could lead to arbitrary code execution (CVE-2016-1950)
  • Out-of-bounds read vulnerability in HTML parser can cause application to crash (CVE-2016-1974)
  • Use-after-free vulnerability in WebRTC could cause exploitable crash (CVE-2016-1973)
  • Multiple vulnerabilities in WebRTC and LibVPX (CVE-2016-1970, CVE-2016-1971, CVE-2016-1975, CVE-2016-1976, CVE-2016-1972)
  • Memory corruption with NPAPI plugin could cause plugin to crash (CVE-2016-1966)
  • Buffer overflow in the Brotli library decompression could lead to buffer overflow (CVE-2016-1968)
  • Same-origin policy violation with performance.getEntries and navigating history after session restore could allow data theft (CVE-2016-1967)
  • Address-bar spoofing when navigating history could mislead users as to address of currently loaded page (CVE-2016-1965)
  • Use-after-free after XML transformations could lead to application crash (CVE-2016-1964)
  • Memory corruption vulnerability with FileReader API that could lead to application crash (CVE-2016-1963)
  • Use-after-free vulnerability with multiple simulataneous WebRTC data channels could lead to application crash (CVE-2016-1962)
  • Use-after-free vulnerability in SetBody function could lead to application crash (CVE-2016-1961)
  • Use-after-free vulnerability in HTML5 string parser could lead to application crash (CVE-2016-1960)
  • Service Worker Manager out-of-bounds vulnerability could lead to application crash (CVE-2016-1959)
  • Address in address bar overwrite vulnerability to mislead user (CVE-2016-1958)
  • Memory leak when deleting array in libstagefright (CVE-2016-1957)
  • DoS vulnerability for Intel Video drivers on Linux (CVE-2016-1956)
  • Information disclosure vulnerability in CSP reports for iframes (CVE-2016-1955)
  • Overwriting local files and privilege escalation vulnerability with CSP reports (CVE-2016-1954)
  • Memory vulnerabilities that could lead to arbitrary code execution (CVE-2016-1952, CVE-2016-1953)

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. Customers whose accounts are configured to have fewer user rights on the system could be less impacted than those who operate with administrative user rights.

  • Apply appropriate updates provided by Mozilla to vulnerable systems, immediately after appropriate testing.
  • 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.