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CVE-2021-37533

Published: 3 December 2022

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.

Priority

Medium

Cvss 3 Severity Score

6.5

Score breakdown

Status

Package Release Status
libcommons-net-java
Launchpad, Ubuntu, Debian
bionic
Released (3.6-1+deb11u1build0.18.04.1)
focal
Released (3.6-1+deb11u1build0.20.04.1)
jammy
Released (3.6-1+deb11u1build0.22.04.1)
kinetic
Released (3.6-1+deb11u1build0.22.10.1)
lunar Not vulnerable
(3.9.0-1)
trusty Ignored
(end of standard support)
upstream Not vulnerable

xenial
Released (3.4-2ubuntu2+esm1)
Available with Ubuntu Pro

Severity score breakdown

Parameter Value
Base score 6.5
Attack vector Network
Attack complexity Low
Privileges required None
User interaction Required
Scope Unchanged
Confidentiality High
Integrity impact None
Availability impact None
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N