CVE-2017-6874 : Exploit Details and Defense Strategies
Learn about CVE-2017-6874, a race condition vulnerability in the Linux kernel up to version 4.10.2, allowing local users to trigger denial of service or system crashes. Find mitigation steps and long-term security practices here.
A race condition in the Linux kernel's kernel/ucount.c file, up to version 4.10.2, allows local users to exploit a vulnerability that can lead to a denial of service or system crash.
Understanding CVE-2017-6874
This CVE involves a race condition in the Linux kernel that can be abused by local users, potentially resulting in a denial of service or system crash.
What is CVE-2017-6874?
The vulnerability in the Linux kernel's kernel/ucount.c file allows local users to trigger a denial of service or system crash by exploiting a race condition. The issue arises from specific system calls that manipulate decrement behavior, leading to incorrect interaction between put_ucounts and get_ucounts functions.
The Impact of CVE-2017-6874
The exploitation of this vulnerability can result in a denial of service, use-after-free scenarios, system crashes, and potentially other unspecified impacts.
Technical Details of CVE-2017-6874
This section provides more technical insights into the CVE.
Vulnerability Description
The race condition in kernel/ucount.c in the Linux kernel through version 4.10.2 allows local users to cause a denial of service or other unspecified impacts by leveraging certain decrement behavior.
Affected Systems and Versions
- Affected System: Linux kernel
- Affected Version: Up to 4.10.2
Exploitation Mechanism
The vulnerability can be exploited by local users through crafted system calls that take advantage of specific decrement behavior, causing incorrect interaction between put_ucounts and get_ucounts functions.
Mitigation and Prevention
Protecting systems from CVE-2017-6874 requires immediate actions and long-term security practices.
Immediate Steps to Take
- Apply security patches provided by the Linux kernel to mitigate the vulnerability.
- Monitor system calls and user activities for any suspicious behavior.
Long-Term Security Practices
- Implement the principle of least privilege to restrict user access.
- Regularly update and patch the Linux kernel to address security vulnerabilities.
Patching and Updates
- Stay informed about security updates and patches released by the Linux kernel community.
- Ensure timely application of patches to keep systems secure.