CVE-2020-10773 : Security Advisory and Response
Learn about CVE-2020-10773, a vulnerability in the Linux kernel's memory manager on s390/s390x architectures allowing local users to view kernel data. Understand the impact, affected systems, and mitigation steps.
A stack information leak flaw in s390/s390x in the Linux kernel's memory manager allows a local user to view kernel data.
Understanding CVE-2020-10773
A vulnerability in the Linux kernel's memory manager can lead to a stack information leak, potentially exposing sensitive kernel data to unauthorized users.
What is CVE-2020-10773?
This CVE identifies a flaw in the Linux kernel's memory manager on s390/s390x architectures that incorrectly writes to a specific file, enabling local users to access kernel data.
The Impact of CVE-2020-10773
The vulnerability has a CVSS base score of 4.4, indicating a medium severity issue with high confidentiality impact but no availability or integrity impact. It requires high privileges to exploit and has a low attack complexity and vector.
Technical Details of CVE-2020-10773
The technical aspects of this CVE provide insight into the vulnerability's description, affected systems, and exploitation mechanism.
Vulnerability Description
A stack information leak flaw in the Linux kernel's memory manager on s390/s390x incorrectly writes to the /proc/sys/vm/cmm_timeout file, allowing local users to view kernel data.
Affected Systems and Versions
- Product: kernel
- Vendor: [UNKNOWN]
- Version: kernel-5.4-rc6
Exploitation Mechanism
The vulnerability can be exploited locally by a user with high privileges to access sensitive kernel data.
Mitigation and Prevention
Understanding how to mitigate and prevent the exploitation of CVE-2020-10773 is crucial for maintaining system security.
Immediate Steps to Take
- Apply patches provided by the vendor promptly.
- Monitor system logs for any suspicious activities.
- Restrict access to sensitive system files and directories.
Long-Term Security Practices
- Regularly update and patch the kernel and related software components.
- Implement the principle of least privilege to limit user access rights.
Patching and Updates
- Stay informed about security updates and advisories from the Linux kernel and the vendor.