CVE-2017-7187 : Vulnerability Insights and Analysis

In the Linux kernel versions up to 4.10.4, a vulnerability exists in the sg_ioctl function in the drivers/scsi/sg.c file. This flaw can be exploited by local users to cause a denial of service through a stack-based buffer overflow.

Understanding CVE-2017-7187

This CVE entry highlights a vulnerability in the Linux kernel that could lead to a denial of service attack.

What is CVE-2017-7187?

The sg_ioctl function in the Linux kernel through version 4.10.4 allows local users to trigger a denial of service or potentially other impacts by exploiting a large command size in an SG_NEXT_CMD_LEN ioctl call, resulting in unauthorized write access beyond allocated bounds.

The Impact of CVE-2017-7187

The vulnerability could allow local users to execute a denial of service attack, specifically a stack-based buffer overflow, or potentially trigger other unknown consequences.

Technical Details of CVE-2017-7187

This section delves into the technical aspects of the CVE.

Vulnerability Description

The sg_ioctl function in drivers/scsi/sg.c in the Linux kernel through 4.10.4 allows local users to cause a denial of service (stack-based buffer overflow) or potentially have unspecified other impacts by exploiting a large command size in an SG_NEXT_CMD_LEN ioctl call, leading to out-of-bounds write access in the sg_write function.

Affected Systems and Versions

Affected versions: Linux kernel versions up to 4.10.4
Systems running the Linux kernel up to version 4.10.4

Exploitation Mechanism

The vulnerability arises due to the mishandling of a large command size in an SG_NEXT_CMD_LEN ioctl call, which results in unauthorized write access beyond the allocated bounds within the sg_write function.

Mitigation and Prevention

Protecting systems from CVE-2017-7187 requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply relevant patches and updates promptly
Monitor for any unusual system behavior
Restrict access to vulnerable systems

Long-Term Security Practices

Regularly update and patch systems to address known vulnerabilities
Implement the principle of least privilege to limit user access
Conduct security training for users to recognize and report suspicious activities

Patching and Updates

Update to a patched version of the Linux kernel beyond 4.10.4 to mitigate the vulnerability
Stay informed about security advisories and apply patches as soon as they are available