PT-2021-19444 · Furlongm · Openvpn-Monitor

Published 2021-09-25 · Updated 2022-05-24 · CVE-2021-31605

Positive Technologies (AI Summary)

CVSS v4.0

8.7

High

Base vector

AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Name of the Vulnerable Software and Affected Versions furlongm openvpn-monitor versions 1.1.3 and earlier

Description The issue allows %0a command injection via the OpenVPN management interface socket, which can be used to shut down the server via signal SIGTERM.

Recommendations For versions 1.1.3 and earlier, consider disabling the OpenVPN management interface socket as a temporary workaround until a patch is available. Restrict access to the management interface to minimize the risk of exploitation. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Command Injection

OS Command Injection

Weakness Enumeration

CWE-77

CWE-78

Related Identifiers

CVE-2021-31605

GHSA-4258-VCJW-WWXX

PYSEC-2021-353

Affected Products

Openvpn-Monitor

References · 12

• https://nvd.nist.gov/vuln/detail/CVE-2021-31605 · Security Note
• https://osv.dev/vulnerability/GHSA-4258-vcjw-wwxx · Vendor Advisory
• https://osv.dev/vulnerability/PYSEC-2021-353 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-31605 · Vendor Advisory
• https://github.com/furlongm/openvpn-monitor/releases · Note
• https://github.com/furlongm/openvpn-monitor · Note
• https://github.com/pypa/advisory-database/tree/main/vulns/openvpn-monitor/PYSEC-2021-353.yaml · Note
• https://t.me/defcon_news/85899 · Telegram Post
• https://t.me/cibsecurity/29430 · Telegram Post
• https://t.me/cvenotify/21809 · Telegram Post
• http://packetstormsecurity.com/files/164278/OpenVPN-Monitor-1.1.3-Command-Injection.html · Note
• https://t.me/cvenotify/21493 · Telegram Post