Medium 0 - toUpperCase XSS Bypass

web-kids20

XSS challenge from the sibearsxss series. User input passes through an escape function that converts all characters to uppercase using `toUpperCase()`.

xss html_entities sibearsxss touppercase bypass

touppercase_bypass_html_entitieshtml_numeric_character_reference

$ ls tags/ techniques/

xss html_entities sibearsxss touppercase bypass

touppercase_bypass_html_entitieshtml_numeric_character_reference

Analysis

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.

$ 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.

Permission denied (requires tier.pro)

Sign in to access full writeups

$sign in

$ grep --similar

Similar writeups

[web][Pro]Medium 2 - Regex Single Replacement Bypass— web-kids20
[web][Pro]Medium 4 - Double Escape XSS— web-kids20
[web][Pro]Medium 1 - Script Src Attribute Breakout— web-kids20
[web][Pro]Easy 4— web-kids20
[web][Pro]Medium 5 - JavaScript URL Scheme Bypass— spbctf