CVE-2020-0156 in Android
Summary
by MITRE
In NxpNfc::ioctl of NxpNfc.cpp, there is a possible out of bounds read due to a missing bounds check. This could lead to local information disclosure with User execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android-10Android ID: A-139736127
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Analysis
by VulDB Data Team • 06/12/2020
The vulnerability identified as CVE-2020-0156 resides within the NxpNfc::ioctl function implementation in the NxpNfc.cpp file of Android's NFC subsystem. This represents a critical security flaw that stems from inadequate input validation mechanisms within the NFC driver component. The issue manifests as a missing bounds check during ioctl command processing, creating an exploitable condition where malicious code can attempt to read memory locations beyond the intended buffer boundaries. The vulnerability specifically affects Android 10 releases and is catalogued under Android ID A-139736127, highlighting its significance within the mobile platform security landscape.
The technical implementation of this flaw occurs at the kernel-level NFC driver interface where the ioctl system call processes input parameters without proper validation of array indices or buffer limits. When an application or process invokes the NFC driver through ioctl commands, the NxpNfc::ioctl function fails to verify that the requested memory access remains within legitimate bounds. This missing bounds check creates a predictable out-of-bounds read condition that can be leveraged by malicious actors to extract sensitive information from adjacent memory regions. The vulnerability's classification as a local information disclosure means that an attacker must already possess user execution privileges on the device, typically through a compromised application or legitimate user account, but does not require additional user interaction for exploitation.
The operational impact of CVE-2020-0156 extends beyond simple information disclosure, as the out-of-bounds read can potentially expose sensitive data such as cryptographic keys, authentication tokens, or personal user information stored in adjacent memory locations. Attackers can exploit this vulnerability to gain insights into the device's internal state and potentially uncover additional attack vectors or system weaknesses. The vulnerability operates under the CWE-129 principle of "Improper Validation of Array Index" and aligns with ATT&CK technique T1059.001 for command and scripting interpreter, where attackers may use such information to craft more sophisticated attacks. The low user interaction requirement makes this particularly concerning as it can be exploited through legitimate NFC operations or applications that utilize NFC functionality.
Mitigation strategies for CVE-2020-0156 should focus on implementing comprehensive bounds checking mechanisms within the NFC driver code, specifically within the NxpNfc::ioctl function. Android security patches should enforce strict validation of all input parameters before memory access operations, ensuring that array indices and buffer sizes remain within expected ranges. System administrators and device manufacturers should prioritize applying the latest security updates from Google and NXP, as the vulnerability affects Android 10 and potentially earlier versions. The fix should incorporate defensive programming practices such as bounds verification, memory access validation, and proper error handling to prevent unauthorized memory access. Additionally, organizations should consider implementing runtime monitoring and anomaly detection systems to identify potential exploitation attempts and maintain comprehensive security posture through regular vulnerability assessments and penetration testing.