CVE-2018-7494 in WPLSoft
Summary
by MITRE
WPLSoft in Delta Electronics versions 2.45.0 and prior utilizes a fixed length stack buffer where a value larger than the buffer can be read from a file into the buffer, causing the buffer to be overwritten, which may allow remote code execution or cause the application to crash.
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Analysis
by VulDB Data Team • 02/02/2020
The vulnerability identified as CVE-2018-7494 affects WPLSoft software developed by Delta Electronics, specifically versions 2.45.0 and earlier. This issue represents a classic buffer overflow condition that arises from improper input validation within the software's memory management mechanisms. The flaw manifests when the application reads data from an external file into a stack buffer with a predetermined fixed length, without adequate bounds checking to ensure the incoming data does not exceed the allocated buffer size. This type of vulnerability falls under the CWE-121 category of stack-based buffer overflow, which is a well-documented weakness in software development practices and represents a significant security risk.
The technical implementation of this vulnerability allows an attacker to manipulate input data that gets processed by the vulnerable WPLSoft application. When the application attempts to read data from a file into a stack buffer that is insufficient to accommodate the incoming data, the excess information overflows into adjacent memory locations. This overflow can overwrite critical program data, including return addresses, function pointers, or other control structures necessary for proper program execution. The vulnerability's remote exploitation potential means that an attacker could potentially craft malicious input files and deliver them to unsuspecting users through various network-based attack vectors, making this issue particularly dangerous in networked environments.
The operational impact of this vulnerability extends beyond simple application crashes to potentially enable full remote code execution capabilities. When buffer overflow conditions overwrite return addresses or other critical execution pointers, attackers can manipulate the program flow to execute arbitrary code with the privileges of the affected application. This scenario aligns with the ATT&CK framework's technique T1059.007 for command and scripting interpreter, where adversaries may leverage such vulnerabilities to gain persistent access to systems. The potential for remote code execution means that compromised systems could be used as launching points for further attacks within a network infrastructure, making this vulnerability particularly concerning for industrial control systems and embedded devices that Delta Electronics typically supplies.
Mitigation strategies for CVE-2018-7494 should focus on immediate remediation through software updates from Delta Electronics, as the vendor has likely released patches addressing this specific buffer overflow condition. Organizations should implement network segmentation and access controls to limit exposure to potentially compromised systems, while also deploying intrusion detection systems to monitor for suspicious file transfers or network activity that might indicate exploitation attempts. The vulnerability highlights the importance of proper input validation and bounds checking in software development processes, aligning with industry best practices such as those outlined in the OWASP Top Ten and NIST guidelines for secure coding practices. Additionally, regular security assessments and vulnerability scanning should be conducted to identify similar issues in legacy systems and ensure that all software components are running patched versions to prevent exploitation of known vulnerabilities.