CVE-2021-37533

Published on: Not Yet Published

Last Modified on: 01/10/2023 07:29:00 PM UTC

CVE-2021-37533

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

Certain versions of Commons Net from Apache contain the following vulnerability:

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.

CVE-2021-37533 has been assigned by [email protected] to track the vulnerability - currently rated as MEDIUM severity.
Affected Vendor/Software: Apache Software Foundation - Apache Commons Net version < 3.9.0

CVSS3 Score: 6.5 - MEDIUM

Attack Vector ^ⓘ	Attack Complexity	Privileges Required	User Interaction
NETWORK	LOW	NONE	REQUIRED
Scope	Confidentiality Impact	Integrity Impact	Availability Impact
UNCHANGED	HIGH	NONE	NONE

CVE References

Description	Tags ^ⓘ	Link
No Description Provided	lists.apache.org text/html	MISC lists.apache.org/thread/o6yn9r9x6s94v97264hmgol1sf48mvx7
oss-security - CVE-2021-37533: Apache Commons Net's FTP client trusts the host from PASV response by default	www.openwall.com text/html	MLIST [oss-security] 20221203 CVE-2021-37533: Apache Commons Net's FTP client trusts the host from PASV response by default
[SECURITY] [DLA 3251-1] libcommons-net-java security update	lists.debian.org text/html	MLIST [debian-lts-announce] 20221229 [SECURITY] [DLA 3251-1] libcommons-net-java security update
Debian -- Security Information -- DSA-5307-1 libcommons-net-java	www.debian.org Depreciated Link text/html	DEBIAN DSA-5307

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Related QID Numbers

181450 Debian Security Update for libcommons-net-java (DLA 3251-1)
181451 Debian Security Update for libcommons-net-java (DSA 5307-1)

Exploit/POC from Github

Prior to Apache Commons Net 3.9.0, Net's FTP client trusts the host from PASV response by default. A malicious server…

Known Affected Configurations (CPE V2.3)

Type	Vendor	Product	Version	Update	Edition	Language
Application	Apache	Commons Net	All	All	All	All
Operating System	Debian	Debian Linux	10.0	All	All	All
Operating System	Debian	Debian Linux	11.0	All	All	All

cpe:2.3:a:apache:commons_net:*:*:*:*:*:*:*:*:
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*:
cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*:

Discovery Credit

Apache Commons would like to thank ZeddYu Lu for reporting this issue.

Social Mentions

Source	Title	Posted (UTC)
@CVEreport	CVE-2021-37533 : Prior to #Apache Commons Net 3.9.0, Net's FTP client trusts the host from PASV response by default… twitter.com/i/web/status/1…	2022-12-03 15:05:06
/r/netcve	CVE-2021-37533	2022-12-03 16:38:44