CVE-2015-2064 in DLGuard
Summary
by MITRE
Multiple cross-site scripting (XSS) vulnerabilities in DLGuard 5, 4.6, and 4.5 allow remote attackers to inject arbitrary web script or HTML via the (1) page, (2) c, or (3) redirect parameter to index.php or (4) search field (searchTerm parameter) in the main page.
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Analysis
by VulDB Data Team • 04/13/2018
The vulnerability identified as CVE-2015-2064 represents a critical cross-site scripting flaw affecting DLGuard versions 5, 4.6, and 4.5. This vulnerability resides in the web application's input validation mechanisms, specifically within the parameter handling of the index.php script and the main page search functionality. The affected parameters include page, c, redirect, and searchTerm, which collectively represent common attack vectors for injecting malicious scripts into web applications. The vulnerability classification aligns with CWE-79, which describes improper neutralization of input during web page generation, making it a canonical example of XSS weaknesses in web applications. These vulnerabilities fall under the ATT&CK technique T1203, specifically targeting web application security through client-side script injection.
The technical exploitation of this vulnerability occurs when remote attackers manipulate the specified parameters to inject malicious JavaScript code or HTML content into the web application's response. When the vulnerable DLGuard application processes these parameters without proper sanitization or encoding, the injected scripts execute within the context of other users' browsers. This creates a persistent threat where malicious code can access session cookies, steal user credentials, redirect users to malicious sites, or perform actions on behalf of authenticated users. The attack surface expands significantly when considering that the vulnerability affects multiple versions of the application, suggesting a fundamental flaw in the input processing logic rather than a simple one-time bug.
The operational impact of CVE-2015-2064 extends beyond simple script injection, potentially enabling attackers to establish persistent footholds within affected environments. When attackers successfully exploit these vulnerabilities, they can execute arbitrary commands in the context of the victim's browser, leading to session hijacking, data exfiltration, and privilege escalation. The search field vulnerability particularly amplifies the risk as it provides an easily accessible attack vector that can be exploited through normal user interactions with the application's search functionality. This vulnerability also presents significant risks to user privacy and application integrity, as malicious actors can manipulate the application's behavior to redirect users to phishing sites or inject advertisements and malware into legitimate web pages.
Mitigation strategies for CVE-2015-2064 require immediate implementation of proper input validation and output encoding mechanisms. Organizations should implement strict parameter validation for all input fields, particularly those used in URL parameters and form submissions. The recommended approach involves applying context-specific output encoding before rendering any user-supplied data in web pages, following the principle of least privilege for input handling. Security measures should include implementing Content Security Policy headers, utilizing parameterized queries where applicable, and ensuring that all vulnerable versions of DLGuard are patched or upgraded to secure releases. Additionally, regular security assessments and input validation testing should be conducted to identify similar vulnerabilities in other web applications within the organization's infrastructure. The remediation process should also include comprehensive security training for developers to prevent similar issues in future application development cycles.