#VU70441 Insufficient verification of data authenticity in Apache Commons Net - CVE-2021-37533

Vulnerability identifier: #VU70441

Vulnerability risk: Low

CVSSv4.0: 0.5 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-37533

CWE-ID: CWE-345

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Apache Commons Net
Universal components / Libraries / Software for developers

Vendor: Apache Foundation

Description

The vulnerability allows an attacker to redirect victim to a malicious host.

The vulnerability exists due to the application trusts the host from PASV response by default. A remote attacker can trick the victim into connecting to an attacker controlled FTP server and then redirect the application to another host.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Apache Commons Net: 1.0.0 - 3.8.0

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External links
https://lists.apache.org/thread/o6yn9r9x6s94v97264hmgol1sf48mvx7
https://www.openwall.com/lists/oss-security/2022/12/03/1
https://issues.apache.org/jira/browse/NET-711

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Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?