CVE-2020-0393 in Android
Summary
by MITRE
In decrypt and decrypt_1_2 of CryptoPlugin.cpp, there is a possible out of bounds read due to a missing bounds check. This could lead to local information disclosure with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android-9 Android-10 Android-11Android ID: A-154123412
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Analysis
by VulDB Data Team • 09/18/2020
The vulnerability identified as CVE-2020-0393 resides within the cryptographic plugin component of Android operating systems spanning versions 9 through 11. This issue manifests in the decrypt and decrypt_1_2 functions located within the CryptoPlugin.cpp source file, representing a critical security flaw that could potentially compromise system integrity. The vulnerability stems from a missing bounds check during cryptographic operations, creating an out-of-bounds read condition that allows for unauthorized data access.
The technical implementation flaw occurs when the cryptographic plugin processes decryption operations without properly validating array indices or buffer boundaries before accessing memory locations. This missing validation creates an opportunity for attackers to read memory contents beyond the intended data structures, potentially exposing sensitive information such as cryptographic keys, passwords, or other confidential data stored in adjacent memory regions. The vulnerability operates at the kernel level within the Android security framework, making it particularly concerning given the privileged nature of cryptographic operations.
From an operational perspective, this vulnerability enables local information disclosure attacks where an attacker with minimal privileges can exploit the out-of-bounds read condition to extract confidential data from memory. The attack requires no user interaction and can be executed without additional execution privileges, making it particularly dangerous as it can be exploited by any local process running on the affected Android devices. The Android ID A-154123412 specifically identifies this issue within Google's internal tracking system, highlighting its significance in the Android security ecosystem.
The impact of this vulnerability extends beyond simple information disclosure, as the extracted data could potentially be used to compromise other security mechanisms within the Android system. The CWE-129 identifier applies to this vulnerability, categorizing it as an Improper Input Validation issue where the system fails to properly validate input boundaries before processing. This weakness allows attackers to manipulate memory access patterns to read beyond allocated buffer boundaries, creating potential pathways for further exploitation. The ATT&CK framework would classify this as a privilege escalation technique through local information gathering, where adversaries leverage system weaknesses to extract sensitive data that could aid in more sophisticated attacks.
Mitigation strategies for CVE-2020-0393 primarily involve applying the latest security patches released by Google for Android versions 9 through 11, which typically include bounds checking mechanisms and memory validation routines. System administrators should prioritize updating affected devices to prevent exploitation, while security teams should monitor for any attempts to leverage this vulnerability in the wild. Additional protective measures include implementing proper input validation at all levels of the cryptographic stack and conducting regular security audits of cryptographic implementations to identify similar boundary condition issues that could lead to information disclosure vulnerabilities.