CVE-2019-18655 in File Sharing Wizard
Summary
by MITRE
File Sharing Wizard version 1.5.0 build 2008 is affected by a Structured Exception Handler based buffer overflow vulnerability. An unauthenticated attacker is able to perform remote command execution and obtain a command shell by sending a HTTP GET request including the malicious payload in the URL. A similar issue to CVE-2019-17415, CVE-2019-16724, and CVE-2010-2331.
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Analysis
by VulDB Data Team • 10/09/2024
The vulnerability identified as CVE-2019-18655 represents a critical buffer overflow flaw within File Sharing Wizard version 1.5.0 build 2008 that operates through structured exception handler manipulation. This specific implementation leverages a classic stack-based buffer overflow technique where the application fails to properly validate input length during HTTP GET request processing. The flaw resides in how the application handles URL parameters, particularly when processing user-supplied data that exceeds the allocated buffer space, creating a condition where arbitrary code execution becomes possible through controlled exception handling.
The technical exploitation of this vulnerability follows a well-established pattern that aligns with CWE-121, which describes stack-based buffer overflow conditions. Attackers can craft malicious HTTP GET requests containing oversized payload data that triggers the buffer overflow during structured exception handling operations. The vulnerability's exploitation path demonstrates characteristics consistent with CWE-787, which covers out-of-bounds write conditions, where the buffer overflow allows attackers to overwrite adjacent memory locations including return addresses and exception handler pointers. This manipulation enables attackers to redirect program execution flow and ultimately achieve remote command execution capabilities.
The operational impact of CVE-2019-18655 extends beyond simple remote code execution to include full system compromise and potential lateral movement within network environments. The unauthenticated nature of the attack vector eliminates the need for prior access credentials, making the vulnerability particularly dangerous in exposed network services. Once successfully exploited, attackers can obtain command shell access to the affected system, potentially enabling them to establish persistent access, escalate privileges, or use the compromised system as a launch point for further attacks. This vulnerability's similarity to CVE-2019-17415, CVE-2019-16724, and CVE-2010-2331 suggests a common architectural flaw in the application's input validation and memory management practices, indicating potential for widespread impact across similar software implementations.
Mitigation strategies for CVE-2019-18655 should prioritize immediate patching of the File Sharing Wizard application to the latest version that addresses the buffer overflow vulnerability. Network administrators should implement firewall rules to restrict access to affected services and monitor for suspicious HTTP GET requests containing unusual parameter lengths or malformed data patterns. The implementation of input validation controls and proper bounds checking should be enforced at multiple layers including application-level defenses and web application firewalls. Additionally, the vulnerability's classification under ATT&CK technique T1059.001 for command and script interpreter execution highlights the need for comprehensive monitoring of command execution activities and behavioral analysis to detect anomalous system behavior indicative of exploitation attempts. Security teams should also consider implementing principle of least privilege access controls and regular vulnerability assessments to identify similar flaws in other network services and applications.