ROS-2-500

2.500 Nettle library vulnerability(CVE-2021-20305)

1. Vulnerability Description:

A Nettle library vulnerability involving the use of a failed cryptographic algorithm and allowing an unauthenticated remote attacker to execute arbitrary code.FSTEC Russia Information Security Threats Data Bank Identifier: BDU:2021-02748

2. Possible measures to eliminate the vulnerability

Prohibit working with Nettle library or - install security updates for the package: Nettle**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 the 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 (with dependencies if necessary): http://repo.red-soft.ru/redos/7.2c/x86_64/updates/nettle-3.4-3.el7.x86_64.rpm Check the integrity and authenticity of the package according to instructionsInstall the downloaded package(s) with the command:# yum localinstall *.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 the installation.

Date of last modification: 08.09.2021