Mozilla Releases Security Update

Number: AV17-021
Date: 14 February 2017


The purpose of this advisory is to raise awareness of a vulnerability in Mozilla Firefox for Android devices for which an update is now available.


Mozilla has released a security update for Firefox for Android devices which address an issue where the cache directory is world writable. The severity of this issue is considered to be critical.

This vulnerability has been fixed in version 51.0.3 of Firefox.

CVE References: CVE-2017-5397

Suggested action

CCIRC recommends that system administrators test and deploy the vendor-released update to affected applications accordingly.


Note to Readers

In support of Public Safety's mission to build a safe and resilient Canada, CCIRC's mandate is to help ensure the security and resilience of the vital non-federal government cyber systems that underpin Canada's national security, public safety and economic prosperity. As Canada's computer security incident response team, CCIRC is Canada's national coordination centre for the prevention and mitigation of, preparedness for, response to, and recovery from cyber incidents on non-federal government systems. It does this by providing authoritative advice and support, and coordinating information sharing and incident response.

Please note, CCIRC PGP key has recently been updated.

For general information, please contact Public Safety Canada's Public Affairs division at:

Telephone: 613-944-4875 or 1-800-830-3118
Fax: 613-998-9589

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