CVE-2019-19447 : Vulnerability Insights and Analysis
Learn about CVE-2019-19447, a vulnerability in Linux kernel version 5.0.21 that allows attackers to exploit a use-after-free issue in the ext4 file system by mounting a crafted ext4 filesystem image.
The Linux kernel version 5.0.21 contains a vulnerability that can be exploited by mounting a specifically crafted ext4 filesystem image, leading to a use-after-free issue within the ext4 file system.
Understanding CVE-2019-19447
This CVE involves a vulnerability in the Linux kernel version 5.0.21 that can be triggered by manipulating an ext4 filesystem image.
What is CVE-2019-19447?
The vulnerability in the Linux kernel version 5.0.21 allows attackers to exploit a use-after-free issue within the ext4 file system by mounting a malicious ext4 filesystem image.
The Impact of CVE-2019-19447
The exploitation of this vulnerability can result in a use-after-free issue within the ext4_put_super function in the super.c file of the ext4 file system, which is related to the dump_orphan_list function also in super.c.
Technical Details of CVE-2019-19447
This section provides more technical insights into the vulnerability.
Vulnerability Description
The vulnerability in the Linux kernel version 5.0.21 arises from mounting a crafted ext4 filesystem image, performing specific operations, and unmounting, leading to a use-after-free in ext4_put_super in fs/ext4/super.c, related to dump_orphan_list in fs/ext4/super.c.
Affected Systems and Versions
- Affected System: Linux kernel version 5.0.21
- Affected Component: ext4 file system
- Affected Version: Not applicable
Exploitation Mechanism
The vulnerability can be exploited by mounting a specially crafted ext4 filesystem image, triggering specific operations, and then unmounting to cause a use-after-free issue in the ext4_put_super function.
Mitigation and Prevention
Protecting systems from CVE-2019-19447 requires immediate actions and long-term security practices.
Immediate Steps to Take
- Apply security updates provided by the Linux kernel maintainers.
- Monitor official sources for patches and advisories related to this vulnerability.
Long-Term Security Practices
- Regularly update the Linux kernel to the latest stable version.
- Implement secure coding practices to prevent similar vulnerabilities in the future.
Patching and Updates
- Ensure that the Linux kernel is regularly updated to the latest version to mitigate the vulnerability.