CVE-2017-12192 : Vulnerability Insights and Analysis
Learn about CVE-2017-12192, a vulnerability in the Key Management subcomponent of the Linux kernel pre-4.13.5. Discover its impact, affected systems, exploitation method, and mitigation steps.
CVE-2017-12192 was published on October 12, 2017, and affects the Key Management subcomponent of the Linux kernel prior to version 4.13.5. This vulnerability allows local users to trigger a denial of service, leading to system crashes.
Understanding CVE-2017-12192
This CVE identifies a flaw in the function keyctl_read_key within the Linux kernel.
What is CVE-2017-12192?
The vulnerability in keyctl_read_key does not properly consider the scenario where a key can be possessed but negatively instantiated. This oversight can be exploited by local users to cause a denial of service through a manipulated KEYCTL_READ operation.
The Impact of CVE-2017-12192
The vulnerability enables local users to induce a denial of service, resulting in an OOPS and system crash.
Technical Details of CVE-2017-12192
This section provides more technical insights into the CVE.
Vulnerability Description
The function keyctl_read_key in the Key Management subcomponent of the Linux kernel prior to version 4.13.5 does not adequately handle the possibility of a negatively instantiated key, leading to a denial of service vulnerability.
Affected Systems and Versions
- Affected Product: Not applicable
- Affected Vendor: Not applicable
- Affected Version: Not applicable
Exploitation Mechanism
The vulnerability can be exploited by local users through a manipulated KEYCTL_READ operation, causing a denial of service and system crash.
Mitigation and Prevention
Protecting systems from CVE-2017-12192 requires immediate actions and long-term security practices.
Immediate Steps to Take
- Apply relevant patches and updates to the Linux kernel to mitigate the vulnerability.
- Monitor for any unusual system behavior that could indicate exploitation of the vulnerability.
Long-Term Security Practices
- Implement the principle of least privilege to restrict user access and minimize the impact of potential vulnerabilities.
- Regularly update and patch systems to address security flaws and enhance overall system security.
Patching and Updates
Ensure that the Linux kernel is updated to version 4.13.5 or newer to address the vulnerability identified in CVE-2017-12192.