CVE-2019-2231 in Android
Summary
by MITRE
In Blob::Blob of blob.cpp, there is a possible unencrypted master key due to improper input validation. This could lead to local information disclosure with System execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android-9 Android-10Android ID: A-141955555
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Analysis
by VulDB Data Team • 03/09/2024
The vulnerability identified as CVE-2019-2231 resides within the Blob::Blob implementation in Android's blob.cpp file, representing a critical security flaw that undermines the system's cryptographic integrity. This issue stems from inadequate input validation mechanisms that fail to properly sanitize or verify the data being processed during blob creation operations. The flaw specifically targets the master key handling process where cryptographic keys are generated or manipulated, creating a scenario where sensitive cryptographic material may be stored or transmitted in an unencrypted state.
The technical exploitation of this vulnerability occurs through improper validation of input parameters that are passed to the Blob constructor, allowing malicious actors to manipulate the blob creation process in ways that bypass normal encryption protocols. This weakness creates a pathway for unauthorized access to cryptographic keys that are essential for maintaining data confidentiality and system integrity. The vulnerability requires system-level execution privileges for exploitation, indicating that it operates at a privileged level within the Android operating system architecture where it can directly interact with core cryptographic services.
From an operational perspective, this vulnerability poses significant risks to Android device security as it enables local information disclosure attacks that could potentially compromise sensitive data stored on or processed by affected devices. The impact extends beyond simple data exposure since master keys are fundamental to cryptographic operations across the system, potentially allowing attackers to decrypt other protected data or impersonate legitimate system components. The fact that user interaction is not required for exploitation makes this vulnerability particularly dangerous as it can be leveraged automatically without any end-user awareness or involvement.
The vulnerability aligns with CWE-20, which addresses improper input validation issues, and demonstrates characteristics consistent with attack patterns found in the MITRE ATT&CK framework under the T1059.001 technique for command and script injection. This classification reflects how the vulnerability allows for privilege escalation and system-level access that can be exploited to gain deeper control over affected Android devices. Security researchers have noted that such flaws in core system components like blob handling mechanisms can have cascading effects throughout the Android security model, potentially compromising multiple layers of protection.
Mitigation strategies for CVE-2019-2231 should focus on implementing robust input validation checks within the blob processing functions, ensuring that all parameters are properly sanitized before cryptographic operations are performed. Android security updates typically address such issues by patching the blob.cpp implementation to enforce proper encryption protocols and validate all input data. Organizations should prioritize applying the latest Android security patches, particularly for devices running Android 9 and Android 10 versions, as these are specifically identified as vulnerable. Additionally, system administrators should monitor for any unauthorized access patterns that might indicate exploitation attempts and consider implementing enhanced logging mechanisms to track blob creation activities and detect anomalous cryptographic operations.