CVE-2020-29374 : Exploit Details and Defense Strategies
Learn about CVE-2020-29374, a Linux kernel vulnerability before 5.7.3 allowing unintended write access. Find mitigation steps and long-term security practices here.
An issue was discovered in the Linux kernel before 5.7.3, related to mm/gup.c and mm/huge_memory.c. The get_user_pages (aka gup) implementation can grant unintended write access, aka CID-17839856fd58.
Understanding CVE-2020-29374
This CVE relates to a vulnerability in the Linux kernel that could lead to unintended write access.
What is CVE-2020-29374?
The vulnerability in the Linux kernel before version 5.7.3 allows for unintended write access when the get_user_pages implementation is used for a copy-on-write page.
The Impact of CVE-2020-29374
The vulnerability can potentially be exploited to gain unauthorized write access, compromising the security and integrity of the system.
Technical Details of CVE-2020-29374
This section provides more in-depth technical information about the CVE.
Vulnerability Description
The issue is related to mm/gup.c and mm/huge_memory.c in the Linux kernel, where the get_user_pages implementation does not properly consider the semantics of read operations, leading to unintended write access.
Affected Systems and Versions
- The Linux kernel versions before 5.7.3 are affected by this vulnerability.
Exploitation Mechanism
- Attackers can exploit this vulnerability to gain unauthorized write access by leveraging the improper handling of read operations in the get_user_pages implementation.
Mitigation and Prevention
Protecting systems from CVE-2020-29374 requires immediate actions and long-term security practices.
Immediate Steps to Take
- Apply patches provided by the Linux kernel to mitigate the vulnerability.
- Monitor for any unusual write access or system behavior that could indicate exploitation.
Long-Term Security Practices
- Regularly update the Linux kernel to the latest version to ensure all security patches are applied.
- Implement least privilege access controls to limit the impact of potential exploits.
Patching and Updates
- Stay informed about security advisories and updates from Linux kernel sources to promptly address any new vulnerabilities.