CVE-2017-18075 : What You Need to Know
Learn about CVE-2017-18075, a flaw in Linux kernel versions before 4.14.13 that allows local users to trigger denial of service or other impacts. Find mitigation steps and long-term security practices here.
In versions of the Linux kernel prior to 4.14.13, a vulnerability exists in the handling of freeing instances in the crypto/pcrypt.c file, potentially leading to denial of service or other impacts.
Understanding CVE-2017-18075
This CVE involves a flaw in the Linux kernel's handling of freeing instances, which can be exploited by a local user with specific access.
What is CVE-2017-18075?
The vulnerability in the Linux kernel before version 4.14.13 allows a local user to trigger a denial of service or potentially cause other unspecified impacts by executing a specific sequence of system calls.
The Impact of CVE-2017-18075
The vulnerability can result in a denial of service condition due to mishandling of freeing instances in the crypto/pcrypt.c file.
Technical Details of CVE-2017-18075
This section provides more in-depth technical insights into the CVE.
Vulnerability Description
The flaw in the Linux kernel before version 4.14.13 allows a local user to exploit the handling of freeing instances, potentially leading to denial of service or other unspecified impacts.
Affected Systems and Versions
- Affected systems: Linux kernel versions prior to 4.14.13
- Affected components: crypto/pcrypt.c file
- Configuration requirements: Access to the AF_ALG-based AEAD interface and pcrypt
Exploitation Mechanism
By executing a specific sequence of system calls, a local user with access to the required interfaces can trigger a denial of service or potentially cause other unspecified impacts.
Mitigation and Prevention
Protecting systems from CVE-2017-18075 requires immediate actions and long-term security practices.
Immediate Steps to Take
- Update to Linux kernel version 4.14.13 or newer to mitigate the vulnerability
- Restrict access to the AF_ALG-based AEAD interface and pcrypt to authorized users
Long-Term Security Practices
- Regularly monitor and apply security patches to the Linux kernel
- Implement the principle of least privilege to limit user access to critical interfaces
Patching and Updates
- Stay informed about security advisories from Linux distributions and vendors
- Apply patches promptly to address known vulnerabilities