External risk intelligence

Samsung Android Devices: Data Write Risk in Charger Driver.

CVE advisoryKnown Exploit

CVE-2021-25394

A vulnerability in Samsung Android devices' MFC charger driver permits unauthorized data writing when a race condition occurs. This requires compromised radio privileges, posing a risk to data integrity and system security. Organizations should prioritize applying vendor updates to mitigate this internal threat.

1Halo Surface Signal

Use After Free

Samsung Android

8.19.010.011.0

External exposure likelihood

Halo Surface Signal score for CVE-2021-25394

The vulnerability exists within a device-specific driver component (MFC charger driver) in the Android operating system. It requires local access to the device and specific privileges to exploit, making it inaccessible via the public internet.

Horizon Alert

Summary of the vulnerability and why it matters

The MFC charger driver in Samsung Android devices is susceptible to a vulnerability that allows unauthorized writing of data. This occurs when a race condition leads to a use-after-free error, provided an attacker has compromised radio privileges. The potential impact includes unauthorized data modification and system compromise.

  • Vulnerable MFC charger driver
  • Race condition allows unauthorized writing
  • Compromised radio privileges needed

Attack Path

How an attacker could exploit the issue

A use-after-free vulnerability within the MFC charger driver allows an attacker with compromised radio privileges to write data. This occurs due to a race condition within the driver. The vulnerability impacts Samsung Android devices.

  • Exposure requires radio privilege compromise.
  • Attacker triggers race condition.
  • Result is arbitrary write.

Live Threat

Current exploitation, exposure, and threat context

A vulnerability exists in Samsung Android devices related to the MFC charger driver. This vulnerability could allow an attacker with specific radio privileges to write to arbitrary locations on the device. The exploitation difficulty is considered high, requiring advanced technical skills and local access.

  • Likely attacker skill level: Advanced
  • Required access or conditions: Local, radio privileges
  • Business risk or urgency: Medium

Priority actions

Operational Fix

Recommended remediation, mitigation, and detection steps

This vulnerability impacts Samsung Android devices by allowing unauthorized data writes if a specific privilege is compromised. Affected systems could experience data integrity issues. Organizations should prioritize remediation to mitigate potential business risks.

  • Identify affected Samsung Android assets.
  • Restrict access to privileged functions.
  • Apply vendor updates and confirm.
  • Monitor for related security events.

Frequently asked questions

What is the MFC charger driver and its role in Samsung Android devices?

The MFC charger driver is a critical component in Samsung Android devices responsible for managing the device's charging functions and power processes. It is the specific driver where the vulnerability CVE-2021-25394 is located.

How does CVE-2021-25394 enable arbitrary data writes?

CVE-2021-25394 is a use-after-free vulnerability stemming from a race condition within the MFC charger driver. This race condition allows an attacker who has already compromised radio privileges to write data to arbitrary locations on the device.

What specific weakness class is identified for CVE-2021-25394?

CVE-2021-25394 is associated with two primary weakness classes: CWE-416, which describes a use-after-free vulnerability, and CWE-362, indicating a race condition.

What is the relevance of CVE-2021-25394 to Samsung Android devices?

This vulnerability affects Samsung Android devices, specifically those with the MFC charger driver. Its relevance is heightened by the potential for arbitrary data writes, which can lead to data integrity issues and system compromise, as noted by Halo Surface Signal.

What steps should be taken to address this vulnerability?

To address this vulnerability, organizations should identify all affected Samsung Android assets, restrict access to privileged functions, and promptly apply vendor-provided updates. Continuous monitoring for related security events is also recommended.

References