CVE-2020-20070 in DWSurvey
Summary
by MITRE • 06/20/2023
Cross Site Scripting vulnerability found in wkeyuan DWSurvey 1.0 allows a remote attacker to execute arbitrary code via thequltemld parameter of the qu-multi-fillblank!answers.action file.
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Analysis
by VulDB Data Team • 04/25/2025
The Cross Site Scripting vulnerability identified as CVE-2020-20070 resides within the wkeyuan DWSurvey 1.0 web application, representing a critical security flaw that exposes the system to remote code execution attacks. This vulnerability specifically manifests through the qultemld parameter within the qu-multi-fillblank!answers.action file, creating an avenue for malicious actors to inject and execute arbitrary scripts within the context of affected user sessions. The flaw operates by failing to properly sanitize or validate user input before processing, allowing attackers to craft malicious payloads that bypass normal security controls and execute within the victim's browser environment.
The technical implementation of this vulnerability stems from inadequate input validation mechanisms within the DWSurvey application's parameter handling system. When the qu-multi-fillblank!answers.action endpoint processes the qultemld parameter, it fails to implement proper sanitization measures that would neutralize potentially malicious script content. This absence of input filtering creates a persistent XSS vector where attacker-controlled data flows directly into the application's response without adequate protection. The vulnerability aligns with CWE-79, which specifically addresses Cross-Site Scripting flaws in web applications, where improper validation of user-supplied data leads to script execution in the victim's browser context.
The operational impact of this vulnerability extends beyond simple script injection, as it enables attackers to perform a range of malicious activities including session hijacking, credential theft, and data exfiltration from authenticated users. Remote attackers can exploit this flaw without requiring any privileged access or authentication, making it particularly dangerous in environments where the application serves multiple users. The vulnerability's exploitation capability allows for persistent attacks where malicious scripts can remain active in the victim's browser session, potentially enabling long-term surveillance or data manipulation. This type of vulnerability directly maps to ATT&CK technique T1566.001, which covers the exploitation of web applications through cross-site scripting attacks.
Mitigation strategies for CVE-2020-20070 should prioritize immediate implementation of input validation and output encoding measures within the DWSurvey application. The most effective approach involves implementing strict parameter validation that filters out or escapes potentially malicious content before processing user input. Security teams should also deploy Content Security Policy headers to limit script execution capabilities and implement proper input sanitization routines that prevent script injection attacks. Additionally, regular security assessments and code reviews should be conducted to identify similar vulnerabilities in other application components. Organizations utilizing DWSurvey 1.0 should urgently upgrade to patched versions or implement temporary workarounds including parameter validation, input filtering, and comprehensive monitoring of suspicious user activities. The vulnerability demonstrates the critical importance of proper input validation in web applications and serves as a reminder of how seemingly minor implementation flaws can lead to significant security breaches.