CVE-2017-17807 : Vulnerability Insights and Analysis

In the Linux kernel version prior to 4.14.6, a vulnerability existed in the KEYS subsystem that allowed a local user to manipulate system calls and add keys to a keyring with limited permissions. This flaw was related to the request_key() system call and the construct_get_dest_keyring() function.

Understanding CVE-2017-17807

This CVE entry describes a security vulnerability in the Linux kernel that could be exploited by a local user to bypass keyring permissions.

What is CVE-2017-17807?

The flaw in the KEYS subsystem allowed a local user to add keys to a keyring with Search permission but without Write permission, by manipulating system calls related to the request_key() function.

The Impact of CVE-2017-17807

The vulnerability could be exploited by a local user to escalate privileges and potentially perform unauthorized actions on the system.

Technical Details of CVE-2017-17807

This section provides more technical insights into the vulnerability.

Vulnerability Description

The flaw in the Linux kernel omitted an access-control check when adding a key to the current task's default request-key keyring, enabling a local user to add keys with limited permissions.

Affected Systems and Versions

Affected systems: Linux kernel versions prior to 4.14.6
Affected versions: Not applicable

Exploitation Mechanism

The vulnerability could be exploited by a local user through a sequence of crafted system calls to add keys to a keyring with restricted permissions.

Mitigation and Prevention

Protecting systems from CVE-2017-17807 requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply relevant security patches provided by the Linux kernel maintainers
Monitor system logs for any suspicious activities related to keyring manipulation

Long-Term Security Practices

Regularly update the Linux kernel to the latest stable version
Implement the principle of least privilege to restrict user access and permissions

Patching and Updates

Ensure timely installation of security updates and patches released by the Linux kernel maintainers to address the vulnerability.