Mozilla - RSA Signature Forgery in NSS

Number: AV14-070
Date: 24 September 2014


The purpose of this advisory is to bring attention to a recently found critical vulnerability in Mozilla's Network Security Services (NSS) Libraries.


Mozilla’s Network Security Services (NSS) libraries are vulnerable to a variant of a signature forgery attack and could lead to the forging of RSA certificates. These forged certificates could allow Man In the Middle Attacks.

Affected Products: Firefox, Thunderbird, SeaMonkey & NSS

Suggested Action

CCIRC recommends that system administrators identify their affected assets and potential interdependencies with their organization’s critical services, and follow their patch management process 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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