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Demonstration by Shritam Bhowmick Web Application Penetration Tester Independent Consulting Security Evangelist Dated: 22nd August, 2014, Springs, 9:22 PM IST Web Application Exploitation with Shritam Bhowmick Contents: Hack...............................................................................................................................................................3 HTML Injection as Code Injection....................................................................................................................5 Deploying a sample Vulnerable ASP code for HTML Injection...........................................................................6 Injecting HTML Code into ASP based Application – HTML Injection................................................................18 Mitigating HTML Injection Vulnerable ASP code..............................................................................................22 Mitigating Vulnerable ASP Code via Input Sanitization....................................................................................23 Mitigating Vulnerable ASP Code via Output Encoding.....................................................................................27 Input Sanitization and Output Encoding Combined.........................................................................................30 Deploying a sample Vulnerable PHP code for HTML Injection..........................................................................31 Injecting HTML code into PHP based Application – HTML Injection.................................................................34 Mitigating HTML Injection Vulnerable PHP Code.............................................................................................36 Mitigating Vulnerable PHP Code via Input Sanitization....................................................................................37 Mitigating Vulnerable PHP Code via Output Sanitization.................................................................................39 Input Sanitization and Output Sanitization Combined.....................................................................................41 Deploying a Sample Vulnerable Python Code for HTML Injection.....................................................................42 Injecting HTML Code into Python based Application – HTML Injection............................................................48 Mitigating HTML Injection Vulnerable Python Code.........................................................................................51 Mitigating Vulnerable Python Code via Escaping.............................................................................................57 Mitigating Python Vulnerable Code via Websafe on Web Library......................................................................62 HTML Injection Scenario 1 – HTMLi on Attribute Context in Tags....................................................................66 HTML Injection Scenario 2 – HTMLi on Output Data Length Restriction..........................................................71 Contact Information.......................................................................................................................................81 Download: https://dl.packetstormsecurity.net/papers/general/codehtml-injection.pdf Source: https://packetstormsecurity.com/files/143995/Code-Injection-HTML-Injection.html