On March 6, the United States Computer Emergency Readiness Team (US-CERT) release a security bulletin to announce a 17-year-old remote code execution vulnerability in the PPP daemon (pppd). This vulnerability affects nearly all Linux-based operating systems and network device firmware. This vulnerability is a buffer overflow vulnerability (CVE-2020-8597), with a CVSS score of 9.8. eap.c in pppd has a rhostname buffer overflow vulnerability in the eap_request and eap_response functions. Via an Extensible Authentication Protocol (EAP) packet, an unauthenticated attacker could exploit this vulnerability to cause arbitrary code execution in an affected system.
pppd is an implementation of the Point-to-Point Protocol which enables communications and data transmission between nodes. pppd is used to establish internet links such as those over dial-up modems, DSL connections, and Virtual Private Networks. pppd is a daemon at the application layer to implement PPP policies, including control protocols of all extended functions such as authentication, compression/decompression and encryption/decryption. pppd usually runs with high privileges and works in conjunction with kernel drivers. This makes it possible for an attacker to potentially execute arbitrary code with system or root level privileges.
For details of this vulnerability, visit the following link:
Scope of Impact
- 4.2 =< pppd =< 2.4.8
Affected Systems and Devices
Red Hat Enterprise Linux
OpenWRT Embedded OS
Synology (DiskStation Manager, VisualStation, Router Manager)
Currently, security updates are released for pppd and products supported by certain Linux systems to fix this vulnerability. Affected users should apply these updates as soon as possible for protection.
|Product||Version with the Vulnerability Fixed||Reference Link|
|Ubuntu 12.04 ESM (Precise Pangolin)||Released (2.4.5-5ubuntu1.3)||https://people.canonical.com/~ubuntu-security/cve/2020/CVE-2020-8597.html|
|Ubuntu 14.04 ESM (Trusty Tahr)||Released (2.4.5-5.1ubuntu2.3+esm1)||https://people.canonical.com/~ubuntu-security/cve/2020/CVE-2020-8597.html|
|Ubuntu 16.04 LTS (Xenial Xerus)||Released (2.4.7-1+2ubuntu1.16.04.2)||https://people.canonical.com/~ubuntu-security/cve/2020/CVE-2020-8597.html|
|Ubuntu 18.04 LTS (Bionic Beaver)||Released (2.4.7-2+2ubuntu1.2)||https://people.canonical.com/~ubuntu-security/cve/2020/CVE-2020-8597.html|
|Ubuntu 19.10 (Eoan Ermine)||Released (2.4.7-2+4.1ubuntu4.1)||https://people.canonical.com/~ubuntu-security/cve/2020/CVE-2020-8597.html|
|Ubuntu 20.04 (Focal Fossa)||Released (2.4.7-2+4.1ubuntu5)||https://people.canonical.com/~ubuntu-security/cve/2020/CVE-2020-8597.html|
|Debian 8||ppp 2.4.6-3.1+deb8u1||https://security-tracker.debian.org/tracker/source-package/ppp|
|Debian 9||ppp 2.4.7-1+4+deb9u1||https://www.debian.org/security/2020/dsa-4632|
|Debian 10||ppp 2.4.7-2+4.1+deb10u1||https://www.debian.org/security/2020/dsa-4632|
Note: You are advised to use a software package management tool such as yum or apt to install these security updates.
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