ROS-2-805

2.805 Vulnerability in OpenVPN (CVE-2020-11810)

1. Vulnerability description:

A corrective release of the OpenVPN Virtual Private Networking Package 2.4.9 has been generated. The new version addresses a vulnerability (CVE-2020-11810) that allows a client session to be transferred to a new IP address that was not previously authorized. The issue can be used to interrupt a newly connected client at the stage when the peer-id has already been generated but session key negotiation has not been completed (one client can stop sessions of other clients).

2. Possible mitigation measures

- Refuse to use virtual private networks based on OpenVPN or - install security updates.**Installing updates is possible in the following ways:**a) If the computer with the installed OS version has access to the vendor’s official repository, run the update as administrator with the command:# yum updateAfter the list of updated packages is displayed, agree to apply updates by pressing the Y key on the keyboard. Wait until the update installation is complete and make sure that there are no errors during its installation.b)If the computer with the installed OS version does not have access to the vendor’s official repository, you should perform the following actions: - download the updated package: http://repo.red-soft.ru/RedOS/7.2c/x86_64/updates/openvpn-2.4.9-1.el7.x86_64.rpm Check the integrity and authenticity of the package according to instructionsInstall the downloaded package with the command:# yum localinstall openvpn-2.4.9-1.el7.x86_64.rpmWhen the list of updated packages is displayed, agree to apply the updates by pressingY on the keyboard. Wait for the updates to finish installing and make sure there are no errors during installation.

Date of last modification: 08.09.2021