CVE-2018-11090 in MyProcureNet
Summary
by MITRE
An XSS issue was discovered in MyBiz MyProcureNet 5.0.0. This vulnerability within "ProxyPage.aspx" allows an attacker to inject malicious client side scripting which will be executed in the browser of users if they visit the manipulated site.
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Analysis
by VulDB Data Team • 02/05/2020
The vulnerability identified as CVE-2018-11090 represents a critical cross-site scripting flaw in MyBiz MyProcureNet version 5.0.0, specifically within the ProxyPage.aspx component. This issue falls under the CWE-79 category of Cross-Site Scripting, which is classified as a fundamental web application security weakness that allows attackers to inject malicious scripts into web pages viewed by other users. The vulnerability exists in the application's handling of user input within the proxy page functionality, creating an avenue for malicious code execution in the context of the victim's browser session. The flaw demonstrates a classic lack of proper input validation and output encoding mechanisms that are essential for preventing malicious script injection attacks.
The technical exploitation of this vulnerability occurs when an attacker crafts malicious input that gets processed by the ProxyPage.aspx component without adequate sanitization. When legitimate users navigate to the compromised page, their browsers execute the injected malicious scripts, potentially leading to session hijacking, credential theft, or redirection to malicious sites. This type of vulnerability is particularly dangerous because it can be leveraged to perform actions on behalf of authenticated users, making it a prime target for advanced persistent threat actors. The attack vector is typically initiated through social engineering tactics where users are tricked into clicking malicious links or visiting compromised web pages that contain the malicious payload.
The operational impact of CVE-2018-11090 extends beyond simple script execution, as it can enable attackers to establish persistent access to affected systems and compromise user data integrity. This vulnerability directly maps to several ATT&CK techniques including T1059.007 for command and scripting interpreter and T1566 for phishing, as attackers can leverage the XSS to deliver additional payloads or redirect victims to malicious sites. Organizations running MyBiz MyProcureNet 5.0.0 are particularly vulnerable to credential theft attacks, session manipulation, and data exfiltration attempts. The attack surface is broadened by the fact that this vulnerability can be exploited through various vectors including email phishing campaigns, compromised web advertisements, or malicious file attachments that redirect users to the vulnerable page.
Mitigation strategies for this vulnerability require immediate implementation of proper input validation and output encoding mechanisms throughout the application's proxy functionality. Security patches should be applied to upgrade the MyBiz MyProcureNet software to versions that address this specific XSS flaw, while organizations should implement content security policies to prevent execution of unauthorized scripts. The remediation process must include thorough code review of the ProxyPage.aspx component to ensure all user-supplied input is properly sanitized and validated before processing. Additionally, implementing web application firewalls and regular security testing can provide additional layers of protection against similar vulnerabilities. Organizations should also conduct comprehensive security awareness training to help users recognize potential phishing attempts that may exploit this vulnerability. The remediation aligns with industry best practices outlined in OWASP Top 10 2017 category A03: Injection, which emphasizes the importance of proper input validation and output encoding to prevent cross-site scripting attacks.