ROS-2-450

2.450 Vulnerability in PPPD (CVE-2020-8597)

1. Vulnerability Description:

The issue (CVE-2020-8597) is a stack buffer overflow vulnerability resulting from a logic error in the EAP (Extensible Authentication Protocol) packet parser in PPPD (eap_request() and eap_response() functions in eap.c). The vulnerability makes it possible to remotely execute arbitrary code on vulnerable systems without authorization and gain full control over them. To do so, an attacker would need to send a specially crafted EAP packet to a vulnerable PPP client or server.

2. Possible remedial actions to address the vulnerability

- stop using the PPP (Point-to-Point Protocol) daemon pppd 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, you need to run the update as an 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.Updated: ppp.x86_64 0:2.4.7-22.el7 Done!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/ppp-2.4.7-22.el7.x86_64.rpm Check the integrity and authenticity of the package according to instructionsInstall the downloaded package with the command:# yum localinstall ppp-2.4.7-22.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 that there are no errors during their installation. Updated: ppp.x86_64 0:2.4.7-22.el7 Done!When the update is finished, it is recommended to reboot the system.

Date of last modification: 08.09.2021