CVE-2025-21008 in libsavsvc.so
Summary
by MITRE • 07/08/2025
Out-of-bounds read in decoding frame header in libsavsvc.so prior to Android 15 allows local attackers to cause memory corruption.
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Analysis
by VulDB Data Team • 07/10/2025
The vulnerability identified as CVE-2025-21008 represents a critical out-of-bounds read condition affecting the libsavsvc.so library component within Android systems prior to version 15. This issue manifests during the frame header decoding process where the system fails to properly validate input boundaries, creating a potential memory corruption scenario that can be exploited by local attackers. The vulnerability resides in the underlying multimedia processing framework that handles various frame format decoding operations, specifically targeting the savsvc service which manages streaming audio and video content processing. The out-of-bounds read occurs when the system attempts to parse frame headers without adequate boundary checks, allowing an attacker to manipulate input data to trigger memory access violations.
The technical flaw stems from insufficient input validation within the frame header parsing routine of the libsavsvc.so library. When processing encoded frame data, the system reads memory locations beyond the allocated buffer boundaries without proper bounds checking mechanisms. This condition typically arises from improper handling of variable-length frame headers where the parsing logic assumes certain data structures maintain expected sizes and formats. The vulnerability is particularly concerning because it operates at a low system level within the multimedia framework, making it difficult to detect and exploit through conventional security measures. The out-of-bounds read can potentially lead to information disclosure, system instability, or even privilege escalation depending on the specific execution context and memory layout. This flaw aligns with CWE-129, which specifically addresses insufficient validation of length of input buffers, and represents a classic example of improper input validation that can lead to memory corruption vulnerabilities.
From an operational perspective, this vulnerability presents significant risk to Android devices running versions prior to Android 15 as it allows local attackers with application-level privileges to potentially cause system-wide memory corruption. The attack surface is expanded by the fact that the vulnerability exists within a core system service that handles multimedia content processing, meaning any application with appropriate permissions could potentially exploit this condition. The memory corruption could result in application crashes, system instability, or more severe consequences depending on how the corrupted memory is subsequently accessed. Attackers could leverage this vulnerability to gain unauthorized access to sensitive information stored in memory or potentially escalate privileges to system-level access. The impact is particularly severe in enterprise environments where Android devices may be running outdated versions and where the savsvc service is frequently utilized for media processing tasks.
Mitigation strategies for CVE-2025-21008 should prioritize immediate system updates to Android 15 or later versions where the vulnerability has been addressed through proper input validation and boundary checking mechanisms. Organizations should implement comprehensive patch management processes to ensure all Android devices receive timely security updates, particularly focusing on enterprise device management systems that may delay updates. Additionally, implementing runtime monitoring and anomaly detection systems can help identify potential exploitation attempts by monitoring for unusual memory access patterns or system behavior that might indicate exploitation of the out-of-bounds read condition. Security configurations should include disabling unnecessary multimedia services when not actively required and implementing strict application permissions to limit potential attack vectors. The vulnerability demonstrates the importance of robust input validation in system-level components and aligns with ATT&CK technique T1059.007 for command and scripting interpreter, as exploitation might involve crafting malicious frame headers to trigger the memory corruption. Organizations should also consider implementing network segmentation and access controls to limit local attack surface and reduce the potential impact of successful exploitation attempts.