CVE-2017-18257 : Vulnerability Insights and Analysis
Learn about CVE-2017-18257, a Linux kernel vulnerability pre-4.11 allowing local users to trigger a denial of service. Find mitigation steps and affected versions here.
In the Linux kernel version prior to 4.11, an integer overflow and loop vulnerability exists in the __get_data_block function located in fs/f2fs/data.c. By maliciously utilizing the open and fallocate system calls along with an FS_IOC_FIEMAP ioctl, local users can trigger a denial of service.
Understanding CVE-2017-18257
This CVE involves a vulnerability in the Linux kernel that can be exploited by local users to cause a denial of service.
What is CVE-2017-18257?
The vulnerability in the __get_data_block function in the Linux kernel before version 4.11 allows local users to trigger a denial of service through specific use of system calls.
The Impact of CVE-2017-18257
The vulnerability can be exploited by local users to cause a denial of service through an integer overflow and loop manipulation.
Technical Details of CVE-2017-18257
This section provides more technical insights into the CVE.
Vulnerability Description
The __get_data_block function in fs/f2fs/data.c in the Linux kernel before 4.11 allows local users to cause a denial of service (integer overflow and loop) via crafted use of system calls.
Affected Systems and Versions
- Product: Not applicable
- Vendor: Not applicable
- Versions: All versions prior to Linux kernel 4.11
Exploitation Mechanism
- Exploitation involves malicious use of the open and fallocate system calls along with an FS_IOC_FIEMAP ioctl.
Mitigation and Prevention
Protecting systems from CVE-2017-18257 requires immediate actions and long-term security practices.
Immediate Steps to Take
- Apply relevant patches provided by the Linux kernel maintainers.
- Monitor system logs for any suspicious activities related to file system operations.
Long-Term Security Practices
- Regularly update the Linux kernel to the latest stable version.
- Implement the principle of least privilege to restrict user access and actions.
Patching and Updates
- Stay informed about security advisories from Linux distributions and the kernel community.
- Promptly apply patches and updates to mitigate known vulnerabilities.