Using Security Engineering to Prevent Phishing – Doyensec
Doyensec's security review identified critical vulnerabilities in a Communication Platform as a Service, including file upload bypasses and subdomain validation flaws, recommending stricter filtering and user warnings to enhance security.
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Doyensec conducted a security review for a client offering a Communication Platform as a Service, focusing on vulnerabilities related to phishing and social engineering attacks. The review highlighted several critical issues, including a file upload vulnerability that allowed bypassing file extension restrictions by appending a trailing period to prohibited extensions. Additionally, flaws in subdomain validation using regular expressions could enable attackers to craft deceptive links. The platform's antivirus scanning was also found to be circumventable through encrypted archives, and HTML input handling had vulnerabilities that could allow UI redressing attacks. Other issues included misleading Unicode domain rendering and URI spoofing via Right-To-Left Override (RTLO) injection. To mitigate these risks, Doyensec recommended stricter filtering, improved user warnings, and the implementation of navigation confirmation screens for external links. This case study illustrates the importance of targeted security engagements to enhance resilience against specific threats, particularly in environments susceptible to social engineering.
- Doyensec's security review focused on vulnerabilities related to phishing and social engineering.
- Key vulnerabilities included file upload bypasses and flawed subdomain validation.
- Recommendations included stricter filtering and user warnings for encrypted files.
- The case study emphasizes the value of targeted security assessments in enhancing platform resilience.
- Navigation confirmation screens were implemented to reduce phishing risks when users follow external links.
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