CVE-2021-27862 : Vulnerability Insights and Analysis
Get insights into CVE-2021-27862, a vulnerability enabling bypass of Layer 2 network filters using LLC/SNAP headers. Learn about affected systems, impact, and mitigation steps.
A detailed overview of CVE-2021-27862 focusing on the vulnerability, its impact, technical details, and mitigation strategies.
Understanding CVE-2021-27862
This section delves into the specifics of CVE-2021-27862, shedding light on the affected systems, exploitation mechanism, and more.
What is CVE-2021-27862?
CVE-2021-27862 entails a vulnerability where Layer 2 network filtering mechanisms can be circumvented using LLC/SNAP headers with an invalid length during Ethernet to Wifi frame translation.
The Impact of CVE-2021-27862
The vulnerability allows for bypassing Layer 2 network filtering, posing a risk to network security by potentially enabling unauthorized access.
Technical Details of CVE-2021-27862
In this section, we explore the vulnerability description, affected systems, versions, and the exploitation mechanism in detail.
Vulnerability Description
The vulnerability arises due to inadequate validation of LLC/SNAP headers with invalid length during Ethernet to Wifi frame translation, thereby bypassing Layer 2 network filtering mechanisms.
Affected Systems and Versions
Vendor: IEEE
- Product: 802.2
- Versions: 802.2h-1997
Vendor: IETF
- Product: draft-ietf-v6ops-ra-guard-08
- Versions: 08
Exploitation Mechanism
The exploitation of CVE-2021-27862 involves the utilization of LLC/SNAP headers with an incorrect length during the conversion of Ethernet frames to Wifi frames, potentially allowing an attacker to bypass network filters.
Mitigation and Prevention
Explore the necessary steps to mitigate the risks posed by CVE-2021-27862 and prevent potential exploitation.
Immediate Steps to Take
Implement network filtering best practices, monitor network traffic for anomalies, and apply patches or workarounds provided by vendors promptly.
Long-Term Security Practices
Enhance network security by regularly updating filtering mechanisms, conducting security assessments, and educating staff on network security best practices.
Patching and Updates
Stay informed about security updates from IEEE and IETF, and apply patches as soon as they are released to address the vulnerability.