CVE-2019-19816 Explained : Impact and Mitigation
Learn about CVE-2019-19816, a flaw in Linux kernel version 5.0.21 that allows for a slab-out-of-bounds write access vulnerability. Find out how to mitigate and prevent exploitation.
A slab-out-of-bounds write access vulnerability in the Linux kernel version 5.0.21 can be exploited through a manipulated btrfs filesystem image.
Understanding CVE-2019-19816
This CVE involves a flaw in the handling of data stripes in the Linux kernel, leading to a specific type of write access vulnerability.
What is CVE-2019-19816?
In the Linux kernel version 5.0.21, a flaw in handling data stripes set to 1 in __btrfs_map_block in fs/btrfs/volumes.c can result in a slab-out-of-bounds write access vulnerability when a manipulated btrfs filesystem image is mounted and specific operations are performed.
The Impact of CVE-2019-19816
The vulnerability allows an attacker to execute arbitrary code or crash the system by mounting a crafted btrfs filesystem image and performing certain operations.
Technical Details of CVE-2019-19816
This section provides more in-depth technical details about the vulnerability.
Vulnerability Description
The flaw in __btrfs_map_block in fs/btrfs/volumes.c mishandles the number of data stripes set to 1, leading to a slab-out-of-bounds write access vulnerability.
Affected Systems and Versions
- Linux kernel version 5.0.21
Exploitation Mechanism
- An attacker mounts a manipulated btrfs filesystem image
- Executes specific operations to trigger the vulnerability
Mitigation and Prevention
Protecting systems from CVE-2019-19816 requires immediate actions and long-term security practices.
Immediate Steps to Take
- Apply patches provided by the Linux kernel maintainers
- Monitor for any unusual system behavior
Long-Term Security Practices
- Regularly update the kernel to the latest version
- Implement proper access controls and restrictions
Patching and Updates
- Stay informed about security updates from Linux distributions and apply them promptly