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

1) OS Command Injection

EUVDB-ID: #VU76500

Risk: Critical

CVSSv4.0: 9.3 [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]

CVE-ID: CVE-2023-2868

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

Exploit availability: Yes

Description

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.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Email Security Gateway (ESG): 5.1.3 - 9.2.0.008

CPE2.3

• cpe:2.3:a:barracuda_networks:esg:5.1.3:*:*:*:*:*:*:*
• cpe:2.3:a:barracuda_networks:esg:5.1.3.003:*:*:*:*:*:*:*
• cpe:2.3:a:barracuda_networks:esg:5.1.3.004:*:*:*:*:*:*:*

External links

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

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

Yes. This vulnerability is being exploited in the wild.