CVE-2018-25328 in VX Search
Summary
by MITRE • 05/17/2026
VX Search 10.6.18 contains a local buffer overflow vulnerability that allows attackers to overwrite the instruction pointer by supplying an oversized string in the directory field. Attackers can craft a malicious input file containing 271 bytes of junk data followed by a return address to execute arbitrary code with application privileges.
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Analysis
by VulDB Data Team • 05/17/2026
The vulnerability in VX Search 10.6.18 represents a critical buffer overflow flaw that stems from inadequate input validation within the directory field processing functionality. This type of vulnerability falls under the common weakness enumeration CWE-121 which specifically addresses stack-based buffer overflow conditions where insufficient bounds checking allows attackers to overwrite adjacent memory locations including the instruction pointer. The flaw manifests when the application processes directory paths without proper size limitations, creating an exploitable condition where an attacker can supply a maliciously crafted input that exceeds the allocated buffer space.
The technical exploitation of this vulnerability requires precise crafting of input data that exceeds the buffer capacity by exactly 271 bytes of junk data followed by a carefully constructed return address. This specific offset suggests the vulnerability occurs in a stack-based buffer where the attacker must account for existing stack frame contents, saved registers, and the exact buffer size allocation. The return address overwrite enables arbitrary code execution with the privileges of the running application, which typically operates with elevated permissions depending on the system configuration. This exploitation technique aligns with ATT&CK tactic TA0004 (Privilege Escalation) and technique T1068 (Local Privilege Escalation) as the attacker leverages the buffer overflow to gain unauthorized execution capabilities.
The operational impact of this vulnerability extends beyond simple code execution as it provides attackers with a foothold for further system compromise and persistent access. Applications running with elevated privileges create a significant risk escalation opportunity where attackers can potentially access sensitive data, modify system configurations, or establish backdoor access. The vulnerability affects the application's core functionality by disrupting normal directory traversal operations and creating a persistent security risk that remains active until the software is patched or updated. Organizations using VX Search 10.6.18 face potential data breaches, system compromise, and unauthorized access to files and directories that the application manages. The exploitability factor is relatively high due to the predictable nature of stack-based buffer overflows and the minimal complexity required to construct the malicious input.
Mitigation strategies should focus on immediate patch application and input validation improvements. The most effective defense involves updating to the latest version of VX Search that contains proper bounds checking and memory management protections. Additionally, implementing input sanitization measures such as maximum length validation for directory fields, stack canaries, and address space layout randomization can significantly reduce exploitability. Network segmentation and privilege separation practices should be enforced to limit the potential impact of successful exploitation. The vulnerability also highlights the importance of regular security assessments and code reviews focusing on memory safety practices. Organizations should implement automated vulnerability scanning tools to identify similar buffer overflow conditions in other applications and maintain updated threat intelligence feeds to monitor for related exploitation attempts. Security monitoring should include detection of unusual directory traversal patterns and attempts to execute code through application interfaces.