The US CISA has issued a warning alert to organizations concerning a recently announced vulnerability in the Barracuda Email Security Gateway Appliance (ESG) which is being actively exploited.
The CISA warning reinforces the Barracuda Networks advisory on vulnerability (CVE-2023-2868) in which Barracuda advises their ESG customers to immediately replace impacted appliances.
CISA urges organizations to:
Review the Barracuda advisory and for all impacted customers to follow the mitigation steps as well as hunt for the listed indicators of compromise (IOCs) to uncover any malicious activity.
CISA also states that:
Barracuda customers who used enterprise privileged credentials for management of their Barracuda appliance (such as Active Directory Domain Admin or similar) should take immediate incident investigation steps to validate the use and behavior of all credentials used on the appliance. It is of utmost importance to verify that threat actors have not compromised customer enterprise networks via this entry vector.