CVE-2021-45485 : What You Need to Know

In the IPv6 implementation in the Linux kernel before 5.13.3, there is an information leak due to inadequate consideration of IPv6 source addresses.

Understanding CVE-2021-45485

In this section, we will delve into the specifics of CVE-2021-45485.

What is CVE-2021-45485?

CVE-2021-45485 relates to an information leak in the Linux kernel's IPv6 implementation, specifically in the net/ipv6/output_core.c file. The vulnerability stems from insufficient handling of IPv6 source addresses.

The Impact of CVE-2021-45485

This vulnerability can be exploited by IPv6-based attackers to leak sensitive information due to improper management of the hash table in the affected kernel versions.

Technical Details of CVE-2021-45485

Let's explore the technical aspects of CVE-2021-45485 in more detail.

Vulnerability Description

The issue in net/ipv6/output_core.c can be exploited by attackers to obtain data from the hash table, allowing leakage of sensitive information.

Affected Systems and Versions

Linux kernel versions before 5.13.3

Exploitation Mechanism

Attackers with knowledge of IPv6 source addresses could exploit this vulnerability to leak information due to the flawed handling of the hash table.

Mitigation and Prevention

In this section, we will discuss measures to mitigate and prevent exploitation of CVE-2021-45485.

Immediate Steps to Take

Update to Linux kernel version 5.13.3 or newer to address the vulnerability
Implement network security measures to detect and block anomalous IPv6 traffic

Long-Term Security Practices

Regularly monitor and audit network traffic for unusual patterns
Keep systems and software up to date to mitigate known vulnerabilities

Patching and Updates

Apply security patches promptly to ensure protection against known vulnerabilities