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攻防世界 ics-07

article 2025/1/9 20:57:28

点击之后发现有个项目管理能进，点进去，点击看到源码，如下三段

<?php session_start(); if (!isset($_GET[page])) { show_source(__FILE__); die(); } if (isset($_GET[page]) && $_GET[page] != 'index.php') { include('flag.php'); }else { header('Location: ?page=flag.php'); } ?>

<?php if ($_SESSION['admin']) { $con = $_POST['con']; $file = $_POST['file']; $filename = "backup/".$file; if(preg_match('/.+\.ph(p[3457]?|t|tml)$/i', $filename)){ die("Bad file extension"); }else{ chdir('uploaded'); $f = fopen($filename, 'w'); fwrite($f, $con); fclose($f); } } ?>

<?php if (isset($_GET[id]) && floatval($_GET[id]) !== '1' && substr($_GET[id], -1) === '9') { include 'config.php'; $id = mysql_real_escape_string($_GET[id]); $sql="select * from cetc007.user where id='$id'"; $result = mysql_query($sql); $result = mysql_fetch_object($result); } else { $result = False; die(); } if(!$result)die("<br >something wae wrong ! <br>"); if($result){ echo "id: ".$result->id."</br>"; echo "name:".$result->user."</br>"; $_SESSION['admin'] = True; } ?>

大概思路是在id满足第三段代码的情况下，使$_SESSION['admin'] = True。然后在以POST方式提供con和file，当file满足条件时，会将con的内容写入uploaded /backup /filename中。在在第一段中包含此文件，可以得到flag.php

先在view-source.php?page=flag.php页面，如下图，输入1' or '9'='9，满足了第三段代码的条件