CVE-2020-0434 in Android
Summary
by MITRE
In Pixel's use of the Catpipe library, there is possible memory corruption due to a use after free. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID: A-150730508
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Analysis
by VulDB Data Team • 09/18/2020
The vulnerability identified as CVE-2020-0434 resides within the Android kernel's implementation of the Catpipe library, representing a critical memory corruption flaw that can be exploited for privilege escalation. This issue specifically manifests as a use after free condition, where the system attempts to access memory that has already been deallocated and potentially reused by other processes. The vulnerability's classification as a local privilege escalation means that an attacker with minimal privileges can leverage this flaw to gain elevated system access without requiring additional execution capabilities or user interaction.
The technical nature of this vulnerability falls under CWE-416, which describes the use of freed memory condition where a program continues to reference memory that has been freed and may have been reallocated for other purposes. In the context of Android's kernel implementation, the Catpipe library serves as a mechanism for inter-process communication that handles pipe operations between different system components. When the library fails to properly manage memory references during pipe operations, it creates opportunities for memory corruption that can be systematically exploited to execute arbitrary code with higher privileges.
From an operational perspective, the impact of this vulnerability extends beyond simple privilege escalation as it represents a fundamental breakdown in the kernel's memory management controls. The lack of user interaction requirement for exploitation makes this vulnerability particularly dangerous as it can be triggered automatically by system processes or malicious applications without requiring any user engagement. The fact that this affects the Android kernel itself means that successful exploitation can potentially provide attackers with complete system control, including access to sensitive data, ability to modify system files, and control over device functionality.
The exploitation of this vulnerability aligns with techniques documented in the ATT&CK framework under privilege escalation tactics, specifically targeting kernel-level vulnerabilities to achieve system-level access. Attackers can leverage the use after free condition to overwrite critical kernel data structures or function pointers, potentially redirecting execution flow to malicious code. This type of vulnerability is particularly concerning in mobile environments where the kernel handles sensitive operations and where exploitation can lead to complete device compromise.
Mitigation strategies for this vulnerability require immediate patching of affected Android kernel versions, with security updates typically addressing the memory management issues within the Catpipe library implementation. Organizations should prioritize deployment of the relevant Android security patches that correct the use after free condition in the kernel's pipe handling mechanisms. Additionally, system administrators should implement monitoring for unusual memory access patterns and ensure that device firmware remains current with security updates. The vulnerability highlights the importance of proper memory management practices in kernel code and reinforces the need for comprehensive security testing of core system components that handle inter-process communication mechanisms.