CVE-2017-17806 Explained : Impact and Mitigation

In the Linux kernel version prior to 4.14.8, a vulnerability exists in the HMAC implementation that can be exploited by a local attacker. This attacker, with access to specific configurations, can trigger a stack buffer overflow by executing a carefully crafted sequence of system calls.

Understanding CVE-2017-17806

This CVE entry highlights a security flaw in the Linux kernel that could lead to a stack buffer overflow.

What is CVE-2017-17806?

The vulnerability in the HMAC implementation of the Linux kernel allows a local attacker to exploit the system by utilizing specific configurations and executing a sequence of system calls.

The Impact of CVE-2017-17806

The vulnerability can be exploited by a local attacker to trigger a stack buffer overflow in the kernel, potentially leading to a denial of service or arbitrary code execution.

Technical Details of CVE-2017-17806

This section provides detailed technical information about the vulnerability.

Vulnerability Description

The issue arises from the lack of validation in the HMAC implementation, allowing an attacker to cause a stack buffer overflow by executing a crafted sequence of system calls.

Affected Systems and Versions

Affected systems: Linux kernel versions prior to 4.14.8
Affected configurations: AF_ALG-based hash interface with CONFIG_CRYPTO_USER_API_HASH and SHA-3 hash algorithm with CONFIG_CRYPTO_SHA3

Exploitation Mechanism

The vulnerability can be exploited by a local attacker with access to the specific configurations mentioned above, enabling them to trigger a stack buffer overflow.

Mitigation and Prevention

Protecting systems from CVE-2017-17806 requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply relevant security patches provided by the Linux kernel maintainers
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
Implement least privilege access controls to limit the impact of potential attacks

Patching and Updates

Ensure that the Linux kernel is regularly updated with the latest security patches to mitigate the risk of exploitation.