CVE-2017-8065 : What You Need to Know

This CVE involves a vulnerability in the Linux kernel versions 4.9.x and 4.10.x through 4.10.12 related to the way crypto/ccm.c interacts with the CONFIG_VMAP_STACK option, potentially leading to denial of service attacks.

Understanding CVE-2017-8065

This CVE, published on April 23, 2017, highlights a flaw in the Linux kernel that could be exploited by local users to cause system crashes or memory corruption.

What is CVE-2017-8065?

The vulnerability arises from incorrect interactions between crypto/ccm.c and the CONFIG_VMAP_STACK option in the Linux kernel versions specified. By utilizing multiple virtual pages for a DMA scatterlist, local users can trigger a denial of service or other unspecified impacts.

The Impact of CVE-2017-8065

The exploitation of this vulnerability can result in a denial of service, leading to system crashes, memory corruption, and potentially other adverse effects. It poses a risk to the stability and security of affected systems.

Technical Details of CVE-2017-8065

This section delves into the technical aspects of the CVE.

Vulnerability Description

The flaw in crypto/ccm.c in Linux kernel versions 4.9.x and 4.10.x through 4.10.12 allows local users to exploit the CONFIG_VMAP_STACK option, potentially causing denial of service through system crashes or memory corruption.

Affected Systems and Versions

Affected Versions: Linux kernel versions 4.9.x and 4.10.x through 4.10.12
Systems: Any systems running the specified vulnerable kernel versions

Exploitation Mechanism

The vulnerability can be exploited by local users leveraging the use of multiple virtual pages for a DMA scatterlist, thereby triggering a denial of service attack.

Mitigation and Prevention

Protecting systems from CVE-2017-8065 requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply relevant patches provided by the Linux kernel maintainers to address the vulnerability.
Monitor for any unusual system behavior that could indicate exploitation of the vulnerability.

Long-Term Security Practices

Regularly update the Linux kernel to the latest stable version to mitigate known vulnerabilities.
Implement the principle of least privilege to restrict user access and minimize the impact of potential attacks.

Patching and Updates

Stay informed about security advisories and updates from the Linux kernel community.
Promptly apply patches and updates to ensure the security of the system.