CVE-2024-48986

https://nvd.nist.gov/vuln/detail/CVE-2024-48986

T1592.002 – Software
T1053.002 – At

1. Technical Attack Analysis:

The vulnerability CVE-2024-48986 in MBed OS 6.16.0 revolves around improper handling of HCI packet lengths, leading to potential buffer overflow conditions. This vulnerability can be exploited by an attacker who sends crafted HCI packets that manipulate the expected buffer size during processing.

Attack Techniques:
– T1592.002 – Software: This technique refers to the exploitation of software vulnerabilities that can lead to unauthorized access or control over software systems. In this case, the buffer overflow could potentially be leveraged to execute arbitrary code or crash the application, leading to a denial of service (DoS).
– T1053.002 – At: This technique involves the use of scheduled task mechanisms. While the primary exploit may focus on the immediate buffer overflow, a successful attacker could potentially schedule tasks that exploit this vulnerability periodically, increasing the chances of destabilizing the system.

Potential Impacts:
– Denial of Service (DoS): The most immediate impact is the potential for system crashes, rendering the affected service or device inoperable.
– System Instability: While the buffer overflow may not allow for arbitrary code execution, it could lead to unpredictable behavior in the software, affecting reliability and performance.
– Limited Exploitability: It is noted that the buffer is dynamically allocated, which could limit the attacker’s ability to escalate privileges or gain deeper access to the system, but the initial impact could still disrupt services significantly.

2. Mitigation Measures:

To mitigate the risks associated with CVE-2024-48986, the following steps should be considered:

– Strengthen Security Configurations:
– Enable multi-factor authentication (MFA) for all administrative access to systems running MBed OS.
– Restrict permissions and access controls to limit exposure of systems that use HCI parsing functionalities.

– Utilize Specific Tools or Security Software:
– Deploy updated antivirus and endpoint protection solutions that can identify and respond to abnormal behaviors or known exploit patterns.
– Implement intrusion detection systems (IDS) to monitor network traffic for suspicious HCI packet patterns that could indicate exploitation attempts.

– Implement Monitoring and Reporting Practices:
– Enable detailed logging of events related to HCI packet processing to identify potential exploitation attempts or anomalies.
– Set up alerts for unusual activity, particularly focusing on the frequency and nature of HCI packets being processed, which could signal an ongoing attack or exploitation attempt.
– Regularly review logs for signs of exploitation and take proactive measures to address any identified vulnerabilities or behaviors.

By following these mitigation steps, organizations can significantly reduce the risk posed by the CVE-2024-48986 vulnerability and enhance their overall cybersecurity posture.

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https://github.com/mbed-ce/mbed-os/blob/54e8693ef4ff7e025018094f290a1d5cf380941f/connectivity/FEATURE_BLE/libraries/cordio_stack/ble-host/sources/hci/dual_chip/hci_evt.c#L3018
https://github.com/mbed-ce/mbed-os/pull/385