CVE-2021-29628 : Security Advisory and Response
Learn about CVE-2021-29628, a FreeBSD vulnerability that could disable SMAP protections, potentially leading to system exploit. Find out how to mitigate and prevent the issue.
In FreeBSD 13.0-STABLE before n245764-876ffe28796c, 12.2-STABLE before r369857, 13.0-RELEASE before p1, and 12.2-RELEASE before p7, a system call triggering a fault could cause SMAP protections to be disabled for the duration of the system call. This weakness could be combined with other kernel bugs to craft an exploit.
Understanding CVE-2021-29628
This CVE affects FreeBSD systems, potentially allowing an attacker to disable SMAP protections by triggering a fault during a system call.
What is CVE-2021-29628?
CVE-2021-29628 is a vulnerability in FreeBSD systems that could disable SMAP protections, creating a security weakness exploitable in combination with other kernel bugs.
The Impact of CVE-2021-29628
The vulnerability could be exploited by attackers to disable SMAP protections temporarily, compromising the security of the system and allowing for potential exploit crafting.
Technical Details of CVE-2021-29628
This section details the vulnerability description, affected systems and versions, as well as the exploitation mechanism.
Vulnerability Description
A system call fault could lead to the disabling of SMAP protections during the call, potentially granting unauthorized access to the system.
Affected Systems and Versions
FreeBSD 13.0-RELEASE before p1 and 12.2-RELEASE before p7 are confirmed to be affected by this vulnerability.
Exploitation Mechanism
By combining this vulnerability with other kernel bugs, attackers could exploit the disabled SMAP protections to launch further attacks.
Mitigation and Prevention
To address CVE-2021-29628, immediate steps should be taken followed by the adoption of long-term security practices and timely patching and updates.
Immediate Steps to Take
System administrators should apply available patches, monitor system logs for suspicious activities, and restrict access to vulnerable systems.
Long-Term Security Practices
Regular security audits, employee training on cybersecurity best practices, and network segmentation can help enhance overall system security.
Patching and Updates
Stay informed about security advisories from FreeBSD, apply patches promptly, and keep systems up to date to prevent exploitation of known vulnerabilities.