Hard 0

spbctf

XSS challenge with regex filter blocking () and ; characters. Bypass using SVG script context with semicolon-less HTML entities (&#40 instead of () to call prompt('sibears') with exact string argument.

filter_bypass xss javascript html_entities svg script_injection

filter_bypassscript_tag_escapesvg_xml_entity_decodingsemicolonless_html_entities

$ ls tags/ techniques/

filter_bypass xss javascript html_entities svg script_injection

filter_bypassscript_tag_escapesvg_xml_entity_decodingsemicolonless_html_entities

Analysis

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$ python3 exploit.py --target 192.168.1.1 --port 8080
[*] Connecting to target...
[+] Shell obtained!

Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.

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