openvpnserv.exe (aka the interactive service helper) in OpenVPN 2.4.x before 2.4.6 allows a local attacker to cause a double-free of memory by sending a malformed request to the interactive service. This could cause a denial-of-service through memory corruption or possibly have unspecified other impact including privilege escalation.
Weakness
The product calls free() twice on the same memory address.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Openvpn | Openvpn | 2.4.0 (including) | 2.4.6 (excluding) |
Potential Mitigations
References
- http://www.slackware.com/security/viewer.php?l=slackware-security\u0026y=2018\u0026m=slackware-security.568761
- https://community.openvpn.net/openvpn/wiki/ChangesInOpenvpn24
- https://github.com/OpenVPN/openvpn/commit/1394192b210cb3c6624a7419bcf3ff966742e79b
- https://github.com/OpenVPN/openvpn/releases/tag/v2.4.6
- https://www.tenable.com/security/research/tra-2018-09
- http://www.slackware.com/security/viewer.php?l=slackware-security\u0026y=2018\u0026m=slackware-security.568761
- https://community.openvpn.net/openvpn/wiki/ChangesInOpenvpn24
- https://github.com/OpenVPN/openvpn/commit/1394192b210cb3c6624a7419bcf3ff966742e79b
- https://github.com/OpenVPN/openvpn/releases/tag/v2.4.6
- https://www.tenable.com/security/research/tra-2018-09