CVE-2023-0460 in YouTube Embedded SDK
Summary
by MITRE • 03/01/2023
The YouTube Embedded 1.2 SDK binds to a service within the YouTube Main App. After binding, a remote context is created with the flags Context.CONTEXT_INCLUDE_CODE | Context.CONTEXT_IGNORE_SECURITY. This allows the client app to remotely load code from YouTube Main App by retrieving the Main App’s ClassLoader. A potential vulnerability in the binding logic used by the client SDK where the SDK ends up calling bindService() on a malicious app rather than YT Main App. This creates a vulnerability where the SDK can load the malicious app’s ClassLoader instead, allowing the malicious app to load arbitrary code into the calling app whenever the embedded SDK is invoked. In order to trigger this vulnerability, an attacker must masquerade the Youtube app and install it on a device, have a second app that uses the Embedded player and typically distribute both to the victim outside of the Play Store.
If you want to get best quality of vulnerability data, you may have to visit VulDB.
Analysis
by VulDB Data Team • 03/30/2023
The vulnerability described in CVE-2023-0460 represents a critical security flaw within the YouTube Embedded SDK version 1.2 that stems from improper service binding mechanisms and insecure class loading practices. This vulnerability operates at the intersection of Android application security and component interaction patterns, creating a pathway for remote code execution through malicious application manipulation. The core issue lies in how the SDK establishes connections to the YouTube main application, specifically through the bindService() mechanism that is intended to connect to legitimate YouTube components but can be exploited through deception.
The technical implementation of this vulnerability relies on the Context.CONTEXT_INCLUDE_CODE and Context.CONTEXT_IGNORE_SECURITY flags that are applied when creating the remote context. These flags effectively disable security checks that would normally prevent code loading from untrusted sources, allowing the embedded SDK to retrieve and utilize the class loader from the YouTube main application. This creates a dangerous attack surface where the SDK's legitimate functionality becomes a vector for malicious code injection. The vulnerability manifests when a malicious application successfully masquerades as the legitimate YouTube application by installing a spoofed version on the target device, thereby tricking the SDK into binding to the malicious service instead of the genuine YouTube application.
The operational impact of this vulnerability extends beyond simple code execution to encompass complete application compromise and potential data exfiltration. When a victim device contains both the malicious YouTube spoof and an application utilizing the embedded SDK, any invocation of the SDK triggers the malicious code loading process. This creates a persistent threat where the attacker maintains control over the victim application's execution environment. The attack requires specific conditions including the installation of a spoofed YouTube application and the presence of a client application that uses the embedded SDK, making it more targeted but still highly dangerous due to the elevated privileges granted through the compromised class loading mechanism.
This vulnerability aligns with CWE-502, which addresses "Deserialization of Untrusted Data" and specifically relates to insecure deserialization patterns that allow remote code execution through trusted component interactions. The attack pattern follows the TTPs outlined in the ATT&CK framework under T1190 - Exploit Public-Facing Application and T1059 - Command and Scripting Interpreter, as it exploits the legitimate SDK interface to execute malicious code within the victim application's context. The exploitation requires a sophisticated attack chain involving application spoofing, service binding manipulation, and class loader injection that demonstrates the complexity of modern Android security vulnerabilities.
Mitigation strategies for this vulnerability must address both the immediate exploitation vectors and the underlying architectural flaws. Application developers should implement runtime checks to verify the authenticity of bound services and consider alternative approaches to service binding that don't rely on the dangerous context flags. The recommended approach involves using more restrictive binding mechanisms and implementing additional verification steps before allowing code loading operations. Security researchers and developers should also consider implementing application integrity checks and monitoring for unauthorized service binding operations. Additionally, Google should update the YouTube Embedded SDK to remove the dangerous Context flags and implement proper service validation mechanisms that prevent binding to spoofed applications. Organizations should also consider network-level monitoring to detect unusual service binding patterns that might indicate exploitation attempts. The vulnerability highlights the importance of secure component interaction design patterns and demonstrates how seemingly legitimate SDK functionality can become a critical security risk when proper security boundaries are not maintained.