CVE-2019-17133 : Security Advisory and Response

A Buffer Overflow vulnerability exists in the Linux kernel up to version 5.3.2. This vulnerability can be exploited through the cfg80211_mgd_wext_giwessid function in the net/wireless/wext-sme.c file, where a long SSID IE is not properly rejected.

Understanding CVE-2019-17133

What is CVE-2019-17133?

In the Linux kernel through 5.3.2, cfg80211_mgd_wext_giwessid in net/wireless/wext-sme.c does not reject a long SSID IE, leading to a Buffer Overflow.

The Impact of CVE-2019-17133

This vulnerability allows attackers to potentially execute arbitrary code or cause a denial of service (DoS) on affected systems.

Technical Details of CVE-2019-17133

Vulnerability Description

The vulnerability arises from the improper handling of long SSID IE in the Linux kernel, potentially leading to a Buffer Overflow.

Affected Systems and Versions

Linux kernel versions up to 5.3.2

Exploitation Mechanism

The vulnerability can be exploited through the cfg80211_mgd_wext_giwessid function in the net/wireless/wext-sme.c file.

Mitigation and Prevention

Immediate Steps to Take

Apply security patches provided by the Linux kernel maintainers promptly.
Monitor official sources for updates and advisories regarding this vulnerability.

Long-Term Security Practices

Regularly update and patch the Linux kernel to mitigate known vulnerabilities.
Implement network segmentation and access controls to limit the impact of potential attacks.
Conduct regular security assessments and audits to identify and address security weaknesses.

Patching and Updates

Ensure that the Linux kernel is updated to a version beyond 5.3.2 to address the Buffer Overflow vulnerability.