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What is this endpoint?
+CSCOU+/portal.css
Cisco ASA Clientless SSL VPN Portal Customization Integrity Vulnerability
What an attacker could do
On a vulnerable Cisco ASA Clientless SSL VPN, attackers can read or tamper with portal customization objects to inject content into the login portal, enabling phishing or credential theft against VPN users (CVE-2014-3393).
How to defend it
Patch Cisco ASA to a fixed software release, disable Clientless SSL VPN if unused, and restrict WebVPN portal access; reset any customization objects that may have been altered.
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Learn More
Want to dive deeper into this topic? Check out the official documentation.
Read Official Documentation