CVE-2021-0436: Information Leak in libdrmclearkeyplugin.so in CryptoPlugin.cpp

platform/hardware/interfaces Updated 02 Oct 2025

Summary

01/04/2021

Disclosed on

CVE-2021-0436

CVE

Yes i

Fix available

High

Severity

Not published

CVSS Score

CVE-2021-0436: In CryptoPlugin::decrypt of CryptoPlugin.cpp, there is a possible out of bounds read due to integer overflow. Affects platform/hardware/interfaces across 4 version ranges.

>= 8.1:0, < 8.1:2021-04-01 >= 9:0, < 9:2021-04-01 >= 10:0, < 10:2021-04-01 >= 11:0, < 11:2021-04-01

Fixed in 8.1:2021-04-01. How to fix ↓

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Background

The package under scrutiny is platform/frameworks/av in the Android ecosystem. It is responsible for providing audio and video functionality to the Android operating system. The vulnerability affects the CryptoPlugin.cpp file in the libdrmclearkeyplugin.so library. This library is used for DRM (Digital Rights Management) decryption. The vulnerability allows for an out of bounds read due to an integer overflow, potentially leading to local information disclosure. This vulnerability does not require any additional execution privileges and does not rely on user interaction for exploitation.

Vulnerability Detail

The vulnerability exists in the CryptoPlugin::decrypt function of CryptoPlugin.cpp. An integer overflow occurs, leading to an out of bounds read. This can result in the disclosure of sensitive information stored in memory. The impact of this vulnerability is limited to local information disclosure, and it does not grant additional execution privileges. The vulnerability affects Android versions 8.1 and above.

How To Fix

Minimum fixed version

8.1:2021-04-01

This is the first release that contains the fix.

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Workaround

There is no specific workaround mentioned for this vulnerability.

Conclusion

In conclusion, the vulnerability CVE-2021-0436 in the CryptoPlugin.cpp file of the libdrmclearkeyplugin.so library can lead to local information disclosure. It is recommended to update the affected package to the fixed version and keep the Android operating system up to date with the latest security patches. For further support on vulnerability remediation, please contact DevNack.com.

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