CVE-2020-35508 : Security Advisory and Response

A flaw possibility of race condition and incorrect initialization of the process id was found in the Linux kernel child/parent process identification handling while filtering signal handlers. A local attacker is able to abuse this flaw to bypass checks to send any signal to a privileged process.

Understanding CVE-2020-35508

This CVE identifies a vulnerability in the Linux kernel that could be exploited by a local attacker to send signals to privileged processes.

What is CVE-2020-35508?

The vulnerability involves a race condition and incorrect initialization in the child/parent process identification mechanism of the Linux kernel, specifically related to signal handler filtering.

The Impact of CVE-2020-35508

The vulnerability allows a local attacker to bypass security checks and send signals to privileged processes, potentially leading to unauthorized access or manipulation of sensitive data.

Technical Details of CVE-2020-35508

The technical aspects of the CVE are as follows:

Vulnerability Description

Type: Race condition and incorrect initialization
Exploitation: Local attacker
Consequence: Bypass security checks for signal handling

Affected Systems and Versions

Product: Kernel
Version: 5.12

Exploitation Mechanism

The flaw can be exploited by a local attacker to send signals to privileged processes, circumventing security measures.

Mitigation and Prevention

To address CVE-2020-35508, consider the following steps:

Immediate Steps to Take

Apply relevant patches and updates promptly
Monitor system logs for any suspicious activities
Restrict access to sensitive processes

Long-Term Security Practices

Regularly update and patch the kernel and other software components
Implement least privilege principles for process handling
Conduct security audits and assessments periodically

Patching and Updates

Ensure timely installation of security patches and updates to mitigate the risk of exploitation.