CVE-2017-17450 : What You Need to Know
Learn about CVE-2017-17450 impacting the Linux kernel through version 4.14.4. Discover the vulnerability details, affected systems, exploitation mechanism, and mitigation steps.
In the Linux kernel through version 4.14.4, a vulnerability exists in net/netfilter/xt_osf.c that allows local users to bypass access restrictions. This CVE was published on December 7, 2017.
Understanding CVE-2017-17450
This CVE impacts the Linux kernel through version 4.14.4 by allowing local users to circumvent access restrictions.
What is CVE-2017-17450?
The vulnerability in net/netfilter/xt_osf.c does not enforce the CAP_NET_ADMIN capability for certain operations, enabling local users to bypass intended access restrictions.
The Impact of CVE-2017-17450
The oversight in enforcing access restrictions allows local users to exploit shared data structures across all net namespaces, potentially leading to unauthorized access and manipulation.
Technical Details of CVE-2017-17450
This section provides more technical insights into the vulnerability.
Vulnerability Description
The Linux kernel through version 4.14.4 does not require the CAP_NET_ADMIN capability for specific operations, leading to unauthorized access by local users.
Affected Systems and Versions
- Product: Not applicable
- Vendor: Not applicable
- Versions: All versions up to 4.14.4 are affected
Exploitation Mechanism
The vulnerability allows local users to bypass access restrictions due to the shared nature of the xt_osf_fingers data structure across all net namespaces.
Mitigation and Prevention
Protecting systems from CVE-2017-17450 requires immediate actions and long-term security practices.
Immediate Steps to Take
- Apply relevant patches and updates promptly
- Monitor system logs for any suspicious activities
- Restrict access to vulnerable systems
Long-Term Security Practices
- Implement the principle of least privilege for user access
- Regularly update and patch the Linux kernel and related components
- Conduct security audits and penetration testing to identify vulnerabilities
Patching and Updates
Ensure that all systems running affected versions of the Linux kernel are updated with the latest patches to mitigate the vulnerability.