CVE-2018-25218 in RAR Password Recovery
Summary
by MITRE • 03/26/2026
PassFab RAR Password Recovery 9.3.2 contains a structured exception handler (SEH) buffer overflow vulnerability that allows local attackers to execute arbitrary code by supplying a malicious payload. Attackers can craft a payload with a buffer overflow, NSEH jump, and shellcode, then paste it into the 'Licensed E-mail and Registration Code' field during registration to trigger code execution.
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Analysis
by VulDB Data Team • 03/26/2026
The vulnerability identified as CVE-2018-25218 represents a critical structured exception handler buffer overflow in PassFab RAR Password Recovery version 9.3.2, classified under CWE-121 as a stack-based buffer overflow. This flaw exists within the software's registration process where the application fails to properly validate input supplied in the 'Licensed E-mail and Registration Code' field. The vulnerability stems from inadequate bounds checking mechanisms that allow attackers to exceed the allocated buffer space during exception handling operations, creating a pathway for arbitrary code execution.
The technical exploitation of this vulnerability leverages the structured exception handling mechanism inherent in windows operating systems, where the application's exception handler chain becomes compromised through a carefully crafted buffer overflow. Attackers construct a malicious payload that includes a buffer overflow sequence followed by a non-standard exception handler (NSEH) jump instruction that redirects execution flow to embedded shellcode. This technique directly corresponds to ATT&CK tactic T1059.007 for command and script interpreter execution, as the malicious code bypasses normal execution paths to inject and execute arbitrary instructions within the target process memory space.
The operational impact of this local privilege escalation vulnerability extends beyond simple code execution, as it enables attackers with local system access to potentially elevate privileges and gain unauthorized control over the affected system. The vulnerability's exploitability requires local user access and does not necessitate network connectivity, making it particularly dangerous in environments where local access is prevalent. The attack vector specifically targets the software's registration functionality, which typically runs with elevated privileges during installation or activation processes, potentially allowing for privilege escalation to system-level access. This vulnerability affects users who have installed the vulnerable version of PassFab RAR Password Recovery, creating a persistent security risk for any system where the software is present.
Mitigation strategies for CVE-2018-25218 should prioritize immediate software updates to the latest available version that contains patched exception handling routines and buffer overflow protections. System administrators should implement application whitelisting policies to restrict execution of untrusted binaries and establish monitoring procedures for unusual registration attempts or system behavior. The vulnerability's classification as a local privilege escalation issue necessitates additional security controls such as mandatory access controls and privilege separation mechanisms. Organizations should also conduct vulnerability assessments to identify all instances of the vulnerable software across their network infrastructure and ensure proper patch management procedures are in place to prevent exploitation attempts. The remediation process should include comprehensive testing of updated software versions to verify that the structured exception handler buffer overflow has been properly addressed and that the application maintains proper input validation during registration processes.