CVE-2025-21007 in libsavsvc.so
Summary
by MITRE • 07/08/2025
Out-of-bounds write in accessing uninitialized memory in libsavsvc.so prior to Android 15 allows local attackers to cause memory corruption.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 07/08/2025
The vulnerability identified as CVE-2025-21007 represents a critical out-of-bounds write condition affecting the libsavsvc.so library component within Android systems prior to version 15. This flaw resides in the system's handling of uninitialized memory during specific access patterns, creating a pathway for local attackers to execute memory corruption attacks. The vulnerability manifests when the system attempts to write data beyond the boundaries of allocated memory regions, potentially leading to arbitrary code execution or system instability. The affected library serves as part of Android's system services framework, making it a core component that could impact multiple system functions when exploited.
The technical implementation of this vulnerability stems from improper memory management within the libsavsvc.so library where uninitialized memory is accessed and subsequently written to without proper bounds checking. This type of flaw falls under the CWE-787 category of out-of-bounds write conditions, which represents a fundamental weakness in memory safety mechanisms. The vulnerability occurs during routine system operations where the library fails to validate memory access boundaries before performing write operations. Attackers can exploit this by crafting specific inputs or conditions that trigger the library's memory handling routines, causing the system to write data beyond intended memory limits and potentially overwrite critical system structures.
The operational impact of this vulnerability extends beyond simple memory corruption, as it provides local attackers with potential paths to escalate privileges and execute arbitrary code within the system context. This represents a significant concern for Android environments where local privilege escalation can lead to full system compromise. The vulnerability affects devices running Android versions prior to 15, indicating that a substantial portion of deployed devices could be impacted. From an attacker perspective, this vulnerability aligns with ATT&CK technique T1068 which involves local privilege escalation, and T1547 which covers persistence mechanisms that could be established through memory corruption exploits.
Mitigation strategies for CVE-2025-21007 should prioritize immediate system updates to Android 15 or later versions where the vulnerability has been addressed through proper bounds checking and memory initialization procedures. Organizations should implement comprehensive patch management protocols to ensure all affected devices receive security updates promptly. Additionally, system administrators should monitor for any anomalous memory access patterns or system crashes that might indicate exploitation attempts. The fix typically involves adding proper validation checks before memory writes, ensuring uninitialized memory regions are properly initialized, and implementing robust bounds checking mechanisms within the libsavsvc.so library. Security teams should also consider implementing runtime monitoring solutions that can detect and prevent unauthorized memory access patterns that could indicate exploitation attempts.