CVE-2024-50269

Dec 23, 2024

Published Date: 2024-11-19T02:16:28.930
Last Modified: 2024-11-26T22:30:27.420

CVSS Score: 7.8 (HIGH)

EPSS Score: 0.04%

Risk Score: 5.46 (HIGH)

Risk Score based on CVSS score and EPSS. This score is for reference purposes and is not internationally recognized.

Meter Needle
CVSS: 7.8  |  EPSS: 0.04%
NVD Links:

Description: In the Linux kernel, the following vulnerability has been resolved:

usb: musb: sunxi: Fix accessing an released usb phy

Commit 6ed05c68cbca (“usb: musb: sunxi: Explicitly release USB PHY on
exit”) will cause that usb phy @glue->xceiv is accessed after released.

1) register platform driver @sunxi_musb_driver
// get the usb phy @glue->xceiv
sunxi_musb_probe() -> devm_usb_get_phy().

2) register and unregister platform driver @musb_driver
musb_probe() -> sunxi_musb_init()
use the phy here
//the phy is released here
musb_remove() -> sunxi_musb_exit() -> devm_usb_put_phy()

3) register @musb_driver again
musb_probe() -> sunxi_musb_init()
use the phy here but the phy has been released at 2).
…

Fixed by reverting the commit, namely, removing devm_usb_put_phy()
from sunxi_musb_exit().

Mitre ATT&CK Technical v15.1

T1053.002 – At

Technical Analysis & Mitigation Measures

1. Technical Attack Analysis:

The vulnerability described in CVE-2024-50269 pertains to improper management of the USB PHY (Physical Layer) in the Linux kernel’s MUSB driver for Sunxi devices. The issue arises when the USB PHY is accessed after it has been released, leading to potential instability and exploitation opportunities.

Attack Techniques:
– T1053.002 – Scheduled Task/Job: This technique involves scheduling tasks that could exploit the vulnerability by repeatedly accessing the released USB PHY. An attacker could potentially create a scenario where the device becomes unresponsive or behaves unpredictably, leading to a denial of service.

Potential Impacts if Exploited:
– Denial of Service (DoS): An attacker could exploit the vulnerability to cause a system crash or instability, leading to service interruptions.
– Data Corruption: Accessing memory that has been released could lead to corrupting critical data or system configurations, impacting system integrity.
– Arbitrary Code Execution: If an attacker can manipulate the access patterns to the USB PHY, they may exploit this to execute arbitrary code, potentially leading to further system compromise.

2. Mitigation Measures:

To address the vulnerabilities associated with CVE-2024-50269, the following mitigation steps should be implemented:

– Strengthen Security Configurations:
– Ensure that kernel updates and patches are applied promptly to mitigate known vulnerabilities.
– Enable multi-factor authentication (MFA) for accessing critical systems and administrative functions.
– Restrict permissions to limit access to device drivers and kernel modules only to trusted users.

– Utilize Specific Tools or Security Software:
– Deploy an intrusion detection system (IDS) to monitor for unusual or malicious activities related to USB access.
– Use antivirus software with heuristic analysis capabilities to detect anomalies in system behavior.
– Implement application whitelisting to restrict the execution of unauthorized software.

– Implement Monitoring and Reporting Practices:
– Enable detailed logging for kernel and driver events to track access and modifications to the USB PHY.
– Set up alerts for unusual activities, such as repeated driver registrations or unregistered access attempts to the USB PHY.
– Conduct regular audits of system logs to identify potential exploitation attempts or abnormal behaviors.

By implementing these measures, organizations can enhance their defenses against exploitation of the CVE-2024-50269 vulnerability and reduce the risk of adverse impacts on their systems.

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Reference Links

Vendor - Produce - Version

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