CVE-2023-21118 : Security Advisory and Response

This CVE record was published on May 15, 2023, by Google Android. It involves an out of bounds read vulnerability in Sensor.cpp, specifically in the unflattenString8 function. This vulnerability could result in a heap buffer overflow, potentially leading to local information disclosure without requiring additional execution privileges. The affected product is Android, with versions including Android-11, Android-12, Android-12L, and Android-13.

Understanding CVE-2023-21118

This section will provide insight into the nature of CVE-2023-21118, its impact, technical details, and mitigation strategies.

What is CVE-2023-21118?

CVE-2023-21118 is a vulnerability found in Sensor.cpp's unflattenString8 function in Android systems. It poses a risk of out of bounds read due to a heap buffer overflow, allowing for potential local information disclosure.

The Impact of CVE-2023-21118

The impact of CVE-2023-21118 is concerning as it could lead to local information disclosure without requiring additional user privileges. This vulnerability may be exploited by threat actors to access sensitive data stored on the affected Android devices.

Technical Details of CVE-2023-21118

In this section, we will delve into the technical aspects of CVE-2023-21118, including vulnerability description, affected systems and versions, and exploitation mechanism.

Vulnerability Description

The vulnerability in unflattenString8 of Sensor.cpp results in an out of bounds read due to a heap buffer overflow. This flaw can be exploited to disclose local information without the need for extra execution privileges.

Affected Systems and Versions

The vulnerability impacts the Android operating system, specifically versions Android-11, Android-12, Android-12L, and Android-13. Devices running these versions are at risk of falling victim to CVE-2023-21118.

Exploitation Mechanism

The exploitation of CVE-2023-21118 involves leveraging the out of bounds read vulnerability in Sensor.cpp to trigger a heap buffer overflow, enabling unauthorized access to sensitive local information.

Mitigation and Prevention

Mitigating CVE-2023-21118 requires immediate actions to reduce the risk of exploitation and enhance the overall security posture of affected systems.

Immediate Steps to Take

Implement security patches provided by Google Android to address the vulnerability promptly.
Monitor for any unusual or suspicious activities on Android devices that could indicate exploitation of the vulnerability.

Long-Term Security Practices

Regularly update and patch Android systems to protect against known vulnerabilities.
Conduct security assessments and audits to identify and address potential weaknesses in the system architecture.

Patching and Updates

Stay informed about security bulletins and updates released by Google Android to apply necessary patches and fixes to mitigate CVE-2023-21118 and other vulnerabilities effectively.