CVE-2025-20963 in Samsung
Summary
by MITRE • 05/07/2025
Out-of-bounds write in memory initialization in libsavsvc.so prior to SMR May-2025 Release 1 allows local attackers to write out-of-bounds memory.
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Analysis
by VulDB Data Team • 05/07/2025
This vulnerability exists within the libsavsvc.so library component of a system's software stack and represents a critical out-of-bounds write condition that can be exploited by local attackers. The flaw occurs during memory initialization processes and specifically affects systems running software versions prior to the SMR May-2025 Release 1 security patch. The out-of-bounds write vulnerability allows an attacker with local access to potentially corrupt adjacent memory locations, which could lead to arbitrary code execution or system instability. This type of vulnerability falls under the CWE-787 category of out-of-bounds write conditions, which are particularly dangerous because they can be leveraged to overwrite critical system memory areas. The ATT&CK framework categorizes this as a privilege escalation technique where local attackers can leverage memory corruption to gain elevated system privileges. The vulnerability's impact is amplified by the fact that it occurs during memory initialization, which typically happens early in system boot processes or when memory allocation routines are invoked. This makes the attack surface more extensive as the flaw can be triggered during normal system operations or when specific memory-intensive processes are executed.
The technical implementation of this vulnerability stems from inadequate bounds checking within the memory initialization routines of libsavsvc.so. During the initialization phase, the system allocates memory blocks and populates them with data, but fails to validate that the write operations remain within allocated memory boundaries. This allows an attacker to craft specific inputs or trigger conditions that cause the system to write data beyond the intended memory allocation. The flaw is particularly concerning because it operates at a low system level where memory corruption can directly affect critical system components. Attackers can exploit this by manipulating input parameters to memory allocation functions or by triggering specific code paths that lead to the vulnerable code section. The vulnerability demonstrates poor defensive programming practices and highlights the importance of implementing robust memory safety mechanisms. The issue affects systems where libsavsvc.so is actively used for system services or memory management operations, potentially compromising the integrity of the entire system.
The operational impact of this vulnerability extends beyond simple memory corruption, as it can lead to complete system compromise when exploited successfully. Local attackers can leverage the out-of-bounds write to overwrite critical system memory areas including function pointers, return addresses, or system configuration data. This memory corruption can result in system crashes, denial of service conditions, or more seriously, allow attackers to execute arbitrary code with the privileges of the affected service. The vulnerability's exploitability is enhanced by the fact that it requires no network connectivity and only local system access, making it particularly dangerous in environments where local privilege escalation is a concern. Systems that rely heavily on memory-intensive operations or those that frequently initialize memory blocks are at higher risk of exploitation. The vulnerability can also serve as a stepping stone for further attacks, allowing attackers to establish persistent access or escalate privileges to gain administrative control over affected systems.
Mitigation strategies for this vulnerability should focus on immediate patching of affected systems with the SMR May-2025 Release 1 or equivalent security updates. Organizations should conduct comprehensive vulnerability assessments to identify all systems running the vulnerable libsavsvc.so library and prioritize patching efforts accordingly. Additionally, implementing runtime protections such as address space layout randomization and stack canaries can help detect and prevent exploitation attempts. System administrators should monitor for suspicious memory access patterns and implement strict access controls to limit local user privileges where possible. The vulnerability highlights the importance of maintaining up-to-date security patches and implementing robust code review processes that include thorough bounds checking and memory safety validation. Organizations should also consider implementing intrusion detection systems that can identify potential exploitation attempts targeting memory corruption vulnerabilities. Regular security audits and penetration testing should include assessment of memory safety mechanisms to ensure that similar vulnerabilities are not present in other system components. The remediation process should also involve comprehensive testing to ensure that patch implementations do not introduce regressions or compatibility issues with existing system functionality.