SB2023052509 - Remote code execution in Barracuda Email Security Gateway appliance (ESG)

Description

This security bulletin contains information about 1 vulnerability.

1) OS Command Injection (CVE-ID: CVE-2023-2868)

CWE-ID: CWE-78 - Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A/U:Red

The vulnerability allows a remote attacker to execute arbitrary shell commands on the target system.

The vulnerability exists due to improper input validation when processing .tar archives during email attachment screening. A remote unauthenticated attacker can send a specially crafted email with a malicious attachment to the appliance and execute arbitrary Perl commands on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Note, the vulnerability is being actively exploited in the wild.

Remediation

Install update from vendor's website.

References

• https://status.barracuda.com/incidents/34kx82j5n4q9
• https://www.barracuda.com/company/legal/esg-vulnerability
• https://www.ic3.gov/Media/News/2023/230823.pdf