CVE-2019-19813 : Security Advisory and Response
Learn about CVE-2019-19813, a vulnerability in Linux kernel version 5.0.21 that can lead to a use-after-free issue. Find out the impact, affected systems, exploitation mechanism, and mitigation steps.
A vulnerability in the Linux kernel version 5.0.21 can lead to a use-after-free issue when manipulating a specially designed btrfs filesystem image.
Understanding CVE-2019-19813
This CVE involves a vulnerability in the Linux kernel version 5.0.21 that can be exploited through specific operations on a manipulated btrfs filesystem image.
What is CVE-2019-19813?
The vulnerability in the Linux kernel version 5.0.21 allows attackers to trigger a use-after-free issue by performing certain operations on a crafted btrfs filesystem image and invoking a syncfs system call.
The Impact of CVE-2019-19813
The vulnerability can result in a use-after-free issue in the __mutex_lock function within the kernel/locking/mutex.c file. It is associated with functions like mutex_can_spin_on_owner, __btrfs_qgroup_free_meta, and btrfs_insert_delayed_items in various files.
Technical Details of CVE-2019-19813
This section provides more technical insights into the vulnerability.
Vulnerability Description
The vulnerability arises from manipulating a specially designed btrfs filesystem image and invoking a syncfs system call, leading to a use-after-free issue in the __mutex_lock function.
Affected Systems and Versions
- Linux kernel version 5.0.21
Exploitation Mechanism
- Attackers can exploit the vulnerability by performing specific operations on a manipulated btrfs filesystem image and invoking a syncfs system call.
Mitigation and Prevention
Protecting systems from CVE-2019-19813 requires immediate actions and long-term security practices.
Immediate Steps to Take
- Apply relevant security patches promptly.
- Monitor vendor advisories for updates.
- Implement least privilege access controls.
Long-Term Security Practices
- Regularly update and patch systems.
- Conduct security assessments and audits.
- Educate users on safe computing practices.
Patching and Updates
- Stay informed about security updates from Linux kernel vendors.
- Apply patches as soon as they are released to mitigate the vulnerability.