CVE-2022-20134 in Android
Summary
by MITRE • 06/15/2022
In readArguments of CallSubjectDialog.java, there is a possible way to trick the user to call the wrong phone number due to improper input validation. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android-10 Android-11 Android-12 Android-12LAndroid ID: A-218341397
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Analysis
by VulDB Data Team • 06/15/2022
The vulnerability identified as CVE-2022-20134 resides within the Android operating system's CallSubjectDialog.java component, specifically in the readArguments method where inadequate input validation creates a potential for social engineering attacks. This flaw allows malicious actors to manipulate phone number inputs during call initiation processes, potentially redirecting users to unintended recipients. The vulnerability is categorized under CWE-20, which represents "Improper Input Validation," a fundamental weakness that enables attackers to inject malicious data into applications. The issue manifests when the system fails to properly validate user inputs before processing phone number entries, creating an attack surface where crafted inputs can be interpreted as legitimate commands.
The technical implementation of this vulnerability involves the improper handling of argument parsing within the call subject dialog functionality. When users attempt to make calls through the Android interface, the system processes arguments related to phone numbers and other call parameters. The readArguments method does not sufficiently sanitize or validate the input data, allowing attackers to inject malformed or manipulated phone number strings. This weakness can be exploited through various means including crafted SMS messages, malicious applications, or even through compromised system components that interact with the call functionality. The vulnerability's classification as a local privilege escalation issue indicates that once exploited, attackers can gain elevated system privileges without requiring additional execution permissions, making the attack particularly dangerous.
The operational impact of CVE-2022-20134 extends beyond simple call redirection, as it creates a pathway for more severe security breaches. While the initial exploitation does not require user interaction, the vulnerability can be leveraged to execute a broader range of malicious activities including unauthorized access to communication channels, potential data exfiltration, and escalation of privileges within the Android environment. The affected Android versions including Android 10, 11, 12, and 12L all share this vulnerability, suggesting it represents a widespread issue within the Android ecosystem. Attackers could potentially use this flaw to redirect emergency calls, intercept sensitive communications, or gain unauthorized access to device resources that would normally require elevated privileges.
Mitigation strategies for this vulnerability should focus on implementing robust input validation mechanisms and strengthening the argument parsing logic within the CallSubjectDialog.java component. Android security teams should prioritize patching affected versions through regular security updates and ensure that all input data undergoes comprehensive sanitization before being processed. Organizations deploying Android devices should monitor for security advisories from Google and implement timely updates to protect against exploitation. The vulnerability's classification under the ATT&CK framework would align with techniques related to privilege escalation and command injection, emphasizing the need for defense-in-depth strategies including application sandboxing, input filtering, and continuous security monitoring to prevent unauthorized access and maintain system integrity.