Yesterday, CISA, along with the FBI, the National Security Agency (NSA), and several international partners released a joint Cybersecurity Advisory (CSA), “Russian Foreign Intelligence Service (SVR) Exploiting JetBrains TeamCity CVE Globally,” to warn that Russian threat actors are exploiting CVE-2023-42793 at a large scale, targeting servers hosting JetBrains TeamCity software.

According to the CSA, since September 2023, Russian Foreign Intelligence Service (SVR)-affiliated cyber actors (also known as Advanced Persistent Threat 29 [APT 29], the Dukes, CozyBear, and NOBELIUM/Midnight Blizzard) have been targeting servers hosting JetBrains TeamCity software that ultimately enabled them to bypass authorization and conduct arbitrary code execution on the compromised server. To bring Russia’s actions to public attention, the authoring agencies are providing information on the SVR’s most recent compromise to aid organizations in conducting their own investigations and securing their networks, provide compromised entities with actionable indicators of compromise (IOCs), and empower partners to better detect and counter the SVR’s malicious actions. The authoring agencies recommend all organizations with affected systems that did not immediately apply available patches or workarounds to assume compromise and initiate threat hunting activities using the IOCs provided in this CSA. If potential compromise is detected, administrators should apply the incident response recommendations included in this CSA and report key findings to the FBI and CISA.

The authoring agencies encourage network defenders and organizations review the joint CSA for recommended mitigations and rules. For more information on affiliated advanced persistent threats, see CISA’s Advanced Persistent Threats and Nation-State Actors and Russia Cyber Threat Overview and Advisories webpages. To report suspicious activity related to information found in advisory, contact your local FBI field office, or the FBI’s 24/7 Cyber Watch (CyWatch) at (855) 292-3937, or by e-mail at CyWatch@fbi.gov. If you have any further questions, or to request incident response resources or technical assistance related to these threats, contact CISA at CISAServiceDesk@cisa.dhs.gov. Access the full advisory at CISA.