CVE-2023-28464 : Exploit Details and Defense Strategies

This CVE record, assigned by MITRE, reveals a critical vulnerability tracked as CVE-2023-28464 in the Linux kernel. The vulnerability, known as hci_conn_cleanup in net/bluetooth/hci_conn.c, affects versions up to 6.2.9 and could result in a use-after-free scenario. Exploitation of this vulnerability through hci_dev_put and hci_conn_put calls may lead to privilege escalation.

Understanding CVE-2023-28464

Let's delve deeper into the details of CVE-2023-28464 to understand its implications and potential impacts.

What is CVE-2023-28464?

CVE-2023-28464 specifically pertains to a use-after-free vulnerability present in the Linux kernel, particularly within the hci_conn_cleanup function in net/bluetooth/hci_conn.c. The vulnerability arises due to improper handling of calls to hci_dev_put and hci_conn_put, resulting in a double free scenario that could be exploited for privilege escalation.

The Impact of CVE-2023-28464

The impact of CVE-2023-28464 is significant as it could potentially allow an attacker to escalate their privileges on a vulnerable system. By exploiting this vulnerability, an unauthorized user could gain elevated access, compromising the security and integrity of the affected system.

Technical Details of CVE-2023-28464

Exploring the technical aspects of CVE-2023-28464 provides insight into the vulnerability's description, affected systems, versions, and exploitation mechanism.

Vulnerability Description

The root cause of CVE-2023-28464 lies in the hci_conn_cleanup function in net/bluetooth/hci_conn.c within the Linux kernel. Improper handling of calls to hci_dev_put and hci_conn_put leads to a use-after-free scenario, potentially enabling privilege escalation through a double free vulnerability.

Affected Systems and Versions

The vulnerability impacts Linux kernel versions up to 6.2.9, making systems running these versions susceptible to exploitation. It is crucial for users of affected systems to take immediate action to mitigate the risk posed by CVE-2023-28464.

Exploitation Mechanism

Exploiting CVE-2023-28464 involves triggering the use-after-free vulnerability in the hci_conn_cleanup function by leveraging the double free condition caused by improper calls to hci_dev_put and hci_conn_put. Through successful exploitation, an attacker could gain unauthorized privileges on the target system.

Mitigation and Prevention

Addressing CVE-2023-28464 requires proactive measures to mitigate the risk and prevent potential exploitation. Implementing immediate steps, adopting long-term security practices, and applying necessary patches and updates are essential for safeguarding vulnerable systems.

Immediate Steps to Take

Users of systems affected by CVE-2023-28464 should consider implementing immediate measures to reduce the likelihood of exploitation. This may include monitoring for any signs of unauthorized activity, restricting access to vulnerable components, and implementing temporary workarounds to mitigate the risk.

Long-Term Security Practices

Incorporating robust security practices into the organization's IT infrastructure is crucial for long-term protection against vulnerabilities like CVE-2023-28464. This involves regular security assessments, thorough vulnerability management, user awareness training, and adherence to secure coding practices to bolster the overall security posture.

Patching and Updates

To effectively address the CVE-2023-28464 vulnerability, users are strongly advised to apply patches and updates provided by the Linux kernel developers. Regularly updating the affected systems with the latest security patches helps in closing known vulnerabilities and minimizing the risk of exploitation.