Alert - Codecov Releases Indicators for Supply Chain Compromise

Number: AL21-009
Date: 4 May 2021

AUDIENCE

This Alert is intended for IT professionals and managers of notified organizations.

PURPOSE

An Alert is used to raise awareness of a recently identified cyber threat Cyber threatA threat actor, using the internet, who takes advantage of a known vulnerability in a product for the purposes of exploiting a network and the information the network carries. that may impact cyber information assets, and to provide additional detection DetectionThe monitoring and analyzing of system events in order to identify unauthorized attempts to access system resources. and mitigation advice to recipients.  The Canadian Centre for Cyber Security Cyber securityThe protection of digital information, as well as the integrity of the infrastructure housing and transmitting digital information. More specifically, cyber security includes the body of technologies, processes, practices and response and mitigation measures designed to protect networks, computers, programs and data from attack, damage or unauthorized access so as to ensure confidentiality, integrity and availability. ("Cyber Centre") is also available to provide additional assistance regarding the content of this Alert to recipients as requested.

OVERVIEW

On 15 April 2021, Codecov notified customers of a compromise CompromiseThe intentional or unintentional disclosure of information, which adversely impacts its confidentiality, integrity, or availability. to their Bash Uploader script that could have resulted in exfiltration ExfiltrationThe unauthorized removal of data or files from a system by an intruder. of environment variables from a client’s continuous integration (CI) environment. Subsequently, on 29 April 2021, Codecov updated the notification with Indicators of Compromise (IoC) to assist organizations in determining if they have been affected by the compromise.

DETAILS

On 15 April 2021, Codecov notified [1] its customers of a supply-chain compromise in which a malicious actor made unauthorized changes to its Bash Uploader script. These changes allowed the actor to potentially exfiltrate environment variables stored in the client's CI environment. Environment variables often contain sensitive information such as tokens, API keys and credentials. On 29 April 2021, Codecov updated the notification to include IoC discovered during its analysis that could be used to assist in determining if an organization has been affected by the compromise. The Cyber Centre recommends that organizations review the referenced IoCs to determine if they have been affected by this activity.

The Cyber Centre is highlighting this Security Update as it provides important information to system owners, and operators responsible for defending their systems and networks from cyber threats.

REFERENCES

[1] Codecov Bash Uploader Security Update
https://about.codecov.io/security-update/

NOTE TO READERS
The Canadian Centre for Cyber Security (Cyber Centre) operates as part of the Communications Security Establishment. We are Canada's national authority on cyber security and we lead the government's response to cyber security events. As Canada's national computer security incident response team, the Cyber Centre works in close collaboration with government departments, critical infrastructure Critical infrastructureProcesses, systems, facilities, technologies, networks, assets, and services essential to the health, safety, security, or economic well-being of Canadians and the effective functioning of government. Critical infrastructure can be stand-alone or interconnected and interdependent within and across provinces, territories, and national borders. Disruptions of critical infrastructure could result in catastrophic loss of life, adverse economic effects, and significant harm to public confidence. , Canadian businesses and international partners to prepare for, respond to, mitigate, and recover from cyber events. We do this by providing authoritative advice and support, and coordinating information sharing and incident response. The Cyber Centre is outward-facing, welcoming partnerships that help build a stronger, more resilient cyber space in Canada.