CVE-2020-10942 : Vulnerability Insights and Analysis
Learn about CVE-2020-10942, a critical vulnerability in the Linux kernel before version 5.5.8 that could allow attackers to trigger kernel stack corruption. Find out how to mitigate the risk and apply necessary security measures.
In the Linux kernel before 5.5.8, a vulnerability in the get_raw_socket function in drivers/vhost/net.c could lead to kernel stack corruption through crafted system calls.
Understanding CVE-2020-10942
This CVE identifies a specific vulnerability in the Linux kernel that could be exploited by attackers to trigger kernel stack corruption.
What is CVE-2020-10942?
This vulnerability exists in the get_raw_socket function within the Linux kernel, specifically in the drivers/vhost/net.c file. The issue arises from the lack of validation of an sk_family field, which could be abused by malicious actors to corrupt the kernel stack using carefully crafted system calls.
The Impact of CVE-2020-10942
The exploitation of this vulnerability could result in kernel stack corruption, potentially leading to system instability, crashes, or unauthorized access to sensitive information.
Technical Details of CVE-2020-10942
This section delves into the technical aspects of the CVE.
Vulnerability Description
The vulnerability stems from the lack of validation of an sk_family field in the get_raw_socket function within the Linux kernel, versions prior to 5.5.8. This oversight could be leveraged by attackers to induce kernel stack corruption.
Affected Systems and Versions
- Affected System: Linux kernel versions before 5.5.8
- Affected Component: get_raw_socket function in drivers/vhost/net.c
Exploitation Mechanism
Attackers can exploit this vulnerability by sending specially crafted system calls to the vulnerable get_raw_socket function, triggering kernel stack corruption.
Mitigation and Prevention
Protecting systems from CVE-2020-10942 requires immediate actions and long-term security practices.
Immediate Steps to Take
- Apply the latest security patches provided by the Linux kernel maintainers.
- Monitor official sources for updates and advisories related to this vulnerability.
Long-Term Security Practices
- Regularly update the Linux kernel to the latest stable version to mitigate known vulnerabilities.
- Implement strict access controls and network segmentation to limit the impact of potential attacks.
Patching and Updates
Ensure timely installation of security patches released by the Linux kernel development team to address the CVE-2020-10942 vulnerability.