CVE-2021-37533 — Apache Commons Net's FTP client trusts the host from PASV response by default

Affected: Apache Software Foundation Apache Commons Net

Prior to Apache Commons Net 3.9.0, Net's FTP client trusts the host from PASV response by default. A malicious server can redirect the Commons Net code to use a different host, but the user has to connect to the malicious server in the first place. This may lead to leakage of information about services running on the private network of the client. The default in version 3.9.0 is now false to ignore such hosts, as cURL does. See https://issues.apache.org/jira/browse/NET-711.

USN-6037-1 — Apache Commons Net vulnerability

Affected: Ubuntu:Pro:16.04:LTS: libcommons-net-java, Ubuntu:18.04:LTS: libcommons-net-java, Ubuntu:20.04:LTS: libcommons-net-java, Ubuntu:22.04:LTS: libcommons-net-java

ZeddYu Lu discovered that the FTP client from Apache Commons Net trusted the host from PASV responses by default. A remote attacker with a malicious FTP server could redirect the client to another server, which could possibly result in leaked information about services running on the private network of the client.

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CVE-2021-37533 — Apache Commons Net's FTP client trusts the host from PASV response by default

USN-6037-1 — Apache Commons Net vulnerability