Transport Layer Security (TLS) Vulnerability

Number: AL17-014
Date: 13 December 2017


The purpose of this alert is to bring attention to a recently disclosed Transport Layer Security (TLS) vulnerability.


CCIRC has become aware of a Transport Layer Security (TLS) vulnerability, also known as Return of Bleichenbacher's Oracle Threat (ROBOT). ROBOT allows an attacker to obtain the RSA key necessary to decrypt TLS traffic under certain conditions.

Suggested Action

Due to the potential risk presented by this vulnerability, CCIRC recommends that system administrators monitor for a vendor released security fix, refer to your product's documentation or contact the vendor's customer service for more information.


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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