Actively exploited in the wild
Barracuda Networks ESG Appliance Improper Input Validation Vulnerability
Barracuda Networks - Email Security Gateway (ESG) Appliance · Listed in the CISA KEV since 2023-05-26. This indicates confirmed attacks in production environments.
Required action: Apply updates per vendor instructions.
CVE-2023-2868
CriticalCVSS 9.4KEVSummary
Remote command injection vulnerability in Barracuda Email Security Gateway (appliance form factor only) affecting versions 5.1.3.001-9.2.0.006. It arises from incomplete input validation of user-supplied .tar file names, allowing a remote attacker to execute a system command with the privileges of the product. Fixed in patch BNSF-36456, automatically applied to all customer appliances.
Risk Assessment
An attacker could remotely execute arbitrary system commands on the device, potentially leading to full compromise of the email gateway and email interception.
Recommendation
Ensure patch BNSF-36456 has been applied (it is automatic). Verify the version and contact Barracuda if in doubt.
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Original NVD description (English source)
A remote command injection vulnerability exists in the Barracuda Email Security Gateway (appliance form factor only) product effecting versions 5.1.3.001-9.2.0.006. The vulnerability arises out of a failure to comprehensively sanitize the processing of .tar file (tape archives). The vulnerability stems from incomplete input validation of a user-supplied .tar file as it pertains to the names of the files contained within the archive. As a consequence, a remote attacker can specifically format these file names in a particular manner that will result in remotely executing a system command through Perl's qx operator with the privileges of the Email Security Gateway product. This issue was fixed as part of BNSF-36456 patch. This patch was automatically applied to all customer appliances.