CVE-2017-12153 : Security Advisory and Response

A vulnerability has been detected in the nl80211_set_rekey_data() function in the Linux kernel version 4.13.3 or earlier, allowing for potential system crashes due to a NULL pointer dereference.

Understanding CVE-2017-12153

This CVE identifies a specific vulnerability in the Linux kernel that can be exploited by attackers with certain capabilities.

What is CVE-2017-12153?

The vulnerability lies in the nl80211_set_rekey_data() function in the nl80211.c file of the Linux kernel version 4.13.3 or earlier. Attackers with the CAP_NET_ADMIN capability can exploit this flaw.

The Impact of CVE-2017-12153

Exploitation of this vulnerability can lead to system crashes due to a NULL pointer dereference, potentially causing service disruptions or denial of service.

Technical Details of CVE-2017-12153

This section provides more technical insights into the vulnerability.

Vulnerability Description

The nl80211_set_rekey_data() function fails to verify the presence of necessary attributes in a Netlink request, enabling attackers to trigger a system crash.

Affected Systems and Versions

Product: Kernel since v3.1-rc1 through v4.13
Vendor: n/a

Exploitation Mechanism

Attackers with the CAP_NET_ADMIN capability can exploit this vulnerability, potentially leading to a system crash due to a NULL pointer dereference.

Mitigation and Prevention

Protecting systems from CVE-2017-12153 requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply relevant patches provided by the Linux kernel maintainers.
Monitor security advisories for updates and apply them promptly.

Long-Term Security Practices

Limit CAP_NET_ADMIN capability to trusted users only.
Implement network segmentation to minimize the impact of potential attacks.

Patching and Updates

Regularly check for updates from the Linux kernel maintainers and apply patches promptly to mitigate the vulnerability.