CVE-2025-20979 in libsavscmn
Summary
by MITRE • 05/07/2025
Out-of-bounds write in libsavscmn prior to Android 15 allows local attackers to execute arbitrary code.
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Analysis
by VulDB Data Team • 10/03/2025
The vulnerability identified as CVE-2025-20979 represents a critical out-of-bounds write flaw within the libsavscmn library component affecting Android versions prior to Android 15. This library serves as a foundational system component responsible for handling various multimedia and communication services within the Android operating system. The flaw manifests as a memory corruption issue that occurs when the system processes specific input data structures, creating opportunities for malicious exploitation.
The technical nature of this vulnerability stems from inadequate bounds checking within the libsavscmn library's memory management routines. When processing certain data inputs, the library fails to validate array indices or buffer limits, allowing attackers to write data beyond the allocated memory boundaries. This memory corruption vulnerability operates under the Common Weakness Enumeration classification of CWE-787 Out-of-bounds Write, which specifically addresses situations where software writes to memory locations outside the intended buffer boundaries. The flaw exists at the intersection of memory safety and input validation, where insufficient boundary checks enable attackers to manipulate memory layout and potentially overwrite critical system structures.
From an operational perspective, this vulnerability creates a significant attack surface for local privilege escalation attacks. An attacker with local access to an affected Android device can leverage this flaw to execute arbitrary code with elevated privileges, potentially gaining full control over the system. The attack vector requires local system access, making it particularly concerning in environments where physical device access is possible or where other vulnerabilities have already been exploited to gain initial access. The impact extends beyond simple code execution, as successful exploitation could lead to complete system compromise, data exfiltration, and persistent backdoor establishment. The vulnerability's presence in a core system library means that successful exploitation could affect multiple system functions and services that rely on the compromised component.
The exploitation of this vulnerability aligns with several tactics described in the MITRE ATT&CK framework, particularly those related to privilege escalation and execution. Attackers could utilize this flaw as part of a multi-stage attack chain where initial access is gained through other means, followed by exploitation of this memory corruption vulnerability to elevate privileges and establish persistent access. The vulnerability also relates to ATT&CK technique T1068, which covers the use of local system exploits to gain higher privileges. Organizations should consider this vulnerability as a critical threat requiring immediate attention, especially in environments where Android devices are used for sensitive operations or contain critical infrastructure components.
Mitigation strategies should prioritize the immediate deployment of Android security patches and updates, particularly for devices running Android versions prior to Android 15. System administrators should implement comprehensive monitoring for unusual system behavior or unauthorized code execution attempts. The vulnerability highlights the importance of regular security assessments and vulnerability management programs that can identify and remediate similar memory corruption issues before they can be exploited. Additionally, organizations should consider implementing network segmentation and access controls to limit potential attack vectors and reduce the impact of successful exploitation attempts. Regular security training for personnel should emphasize the importance of keeping systems updated and recognizing potential indicators of compromise related to memory corruption exploits.