PT-2021-6006 · Perfact · Openvpn-Client

Sharon Brizinov · Published 2021-02-25 · Updated 2022-10-18 · CVE-2021-27406

Positive Technologies (AI Summary)

CVSS v2.0

9.0

High

Base vector

AV:N/AC:L/Au:S/C:C/I:C/A:C

Name of the Vulnerable Software and Affected Versions PerFact OpenVPN-Client versions 1.4.1.0 and prior

Description The issue allows an attacker to send the config command from any application running on the local host machine to force the back-end server into initializing a new open-VPN instance with arbitrary open-VPN configuration. This could result in the attacker achieving execution with privileges of a SYSTEM user. The vulnerability is related to errors in system settings or configuration, which can be exploited by a remote attacker to execute arbitrary code or elevate privileges.

Recommendations For PerFact OpenVPN-Client versions 1.4.1.0 and prior, consider restricting access to the config command to prevent unauthorized initialization of new open-VPN instances until a patch is available. As a temporary workaround, restrict the ability of local applications to send the config command to the back-end server.

Fix

Weakness Enumeration

CWE-15

CWE-610

Related Identifiers

BDU:2022-00567

CVE-2021-27406

Affected Products

Openvpn-Client

References · 7

• https://bdu.fstec.ru/vul/2022-00567 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2021-27406 · Security Note
• https://osv.dev/vulnerability/CVE-2021-27406 · Vendor Advisory
• https://cybersecurity-help.cz/vdb/SB2021030103 · Note
• https://cisa.gov/uscert/ics/advisories/icsa-21-056-01 · Note
• https://us-cert.cisa.gov/ics/advisories/icsa-21-056-01 · Note
• https://t.me/true_secator/2362 · Telegram Post