CVE-2021-31567

Download Monitor <= 4.4.6 - Authenticated (Admin+) Arbitrary File Download

2021-10-29 00:00

Strategic Overview

Status: Patched in 4.4.7
Affected Plugin: Download Monitor
Affected Version: <= 4.4.6
CVSS: 6.8Medium
Weakness type: CWE-552 · Files or Directories Accessible to External Parties
CVE: CVE-2021-31567

View all Download Monitor vulnerabilities

At a glance

CVE-2021-31567 is a medium-severity Files or Directories Accessible to External Parties vulnerability in the Download Monitor WordPress plugin, affecting versions <= 4.4.6. It carries a CVSS score of 6.8 (reachable over the network; low attack complexity; high confidentiality impact). Exploitation requires an authenticated account at Admin level or above. The issue is fixed in version 4.4.7; sites on affected versions should update now. Disclosed October 2021, reported by R3N0.

Vulnerability Overview

Authenticated (admin+) Arbitrary File Download vulnerability discovered in Download Monitor WordPress plugin (versions <= 4.4.6). The plugin allows arbitrary files, including sensitive configuration files such as wp-config.php, to be downloaded via the &downloadable_file_urls[0] parameter data. It's also possible to escape from the web server home directory and download any file within the OS.

Technical Analysis

The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no interaction from a victim user. A successful exploit has high impact on confidentiality.

CWE-552: Files or Directories Accessible to External Parties

The product makes files or directories accessible to unauthorized actors, even though they should not be.

Remediation

Update to version 4.4.7, or a newer patched version

How does WordSec protect against this?

An attacker needs Admin access first, so the firewall sees the attempt as traffic from a logged-in account: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Download Monitor 4.4.7 closes this, and updating the plugin is the step that ends it.

Firewall
Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2021-31567 https://www.wordfence.com/threat-intel/vulnerabilities/id/3b515142-4e04-4570-b5cb-18261974c659 https://nvd.nist.gov/vuln/detail/CVE-2021-31567

Related records

Same weakness class

Other vulnerabilities in Download Monitor

CVSS Vector

6.8

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

Base

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredHigh
User InteractionNone
ScopeChanged
ConfidentialityHigh
IntegrityNone
AvailabilityNone

This record contains material that is subject to copyright

CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE®). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy.

https://www.cve.org/Legal/TermsOfUse

Defiant hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute this software vulnerability information. Any copy of the software vulnerability information you make for such purposes is authorized provided that you include a hyperlink to this vulnerability record and reproduce Defiant's copyright designation and this license in any such copy.

https://www.wordfence.com/wordfence-intelligence-terms-and-conditions/