CVE-2023-21153 in Android
Summary
by MITRE • 06/28/2023
In Do_AIMS_SET_CALL_WAITING of imsservice.cpp, there is a possible out of bounds read due to a missing bounds check. This could lead to local escalation of privilege with System execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID: A-264259730References: N/A
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Analysis
by VulDB Data Team • 09/13/2025
The vulnerability identified as CVE-2023-21153 resides within the Android ims service component, specifically in the Do_AIMS_SET_CALL_WAITING function located in imsservice.cpp. This represents a critical security flaw that stems from inadequate input validation mechanisms within the telephony subsystem. The issue manifests as a missing bounds check that allows for potential out-of-bounds memory read operations, creating a pathway for malicious actors to exploit the system's privilege escalation mechanisms.
The technical nature of this vulnerability places it squarely within CWE-129, which addresses insufficient bounds checking in software implementations. The flaw occurs during call waiting configuration operations within the IMS (IP Multimedia Subsystem) service, where the system fails to validate array indices or buffer boundaries before accessing memory locations. This absence of proper boundary validation creates a condition where attacker-controlled input can cause the application to read memory beyond its allocated boundaries, potentially exposing sensitive data or system resources.
From an operational perspective, this vulnerability presents a significant risk for local privilege escalation attacks, requiring only system execution privileges for exploitation. The attack vector does not necessitate user interaction, making it particularly dangerous as it can be triggered automatically through system-level processes or malicious applications with appropriate permissions. The Android kernel's IMS service handles critical telephony functions including call management, signaling, and communication protocols, making this vulnerability particularly impactful for device security.
The exploitation of this vulnerability could enable an attacker to gain elevated privileges on the affected Android device, potentially allowing them to execute arbitrary code with system-level permissions. This capability would permit unauthorized access to sensitive communications, device configuration data, and other protected system resources. The vulnerability affects Android kernel versions, indicating that it operates at a low-level system component that interfaces directly with hardware and core operating system functions.
Security mitigations for this vulnerability should include immediate patching of affected Android kernel versions and implementation of enhanced bounds checking mechanisms within the IMS service component. Organizations should also consider implementing runtime monitoring and intrusion detection systems to identify potential exploitation attempts. The fix should involve adding proper input validation and boundary checks before any memory access operations, ensuring that all array indices and buffer operations are validated against expected ranges. Additionally, regular security audits of system-level components and adherence to secure coding practices should be enforced to prevent similar vulnerabilities from emerging in future implementations.
This vulnerability aligns with ATT&CK technique T1068, which covers 'Local Privilege Escalation' through kernel exploits, and demonstrates the critical importance of maintaining robust input validation in system-level software components. The absence of user interaction requirements makes this vulnerability particularly concerning for enterprise environments where Android devices may be exposed to various attack vectors, potentially leading to complete device compromise and data exfiltration.