CVE-2025-56353
HighSummary
W tinyMQTT, w wyniku błędu w commitcie 6226ade15bd4f97be2d196352e64dd10937c1962, występuje wyciek pamięci spowodowany brakiem walidacji lub odrzucania niepoprawnych ciągów UTF-8 w filtrach tematów. Atakujący może wykorzystać to, wysyłając powtarzające się żądania subskrypcji z dowolnie dużymi lub niepoprawnymi ładunkami filtrów.
Risk Assessment
W wyniku tego błędu może dojść do nieograniczonego wzrostu pamięci na stercie, co może prowadzić do odmowy usługi w przypadku długotrwałego ataku. Organizacje mogą doświadczyć przestojów w działaniu usług brokerów MQTT.
Recommendation
Zaleca się aktualizację do najnowszej wersji tinyMQTT, która zawiera poprawki dotyczące walidacji filtrów tematów. Dodatkowo, warto monitorować i ograniczać liczbę żądań subskrypcji z niepoprawnymi filtrami.
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Original NVD description (English source)
In tinyMQTT commit 6226ade15bd4f97be2d196352e64dd10937c1962 (2024-02-18), a memory leak occurs due to the broker's failure to validate or reject malformed UTF-8 strings in topic filters. An attacker can exploit this by sending repeated subscription requests with arbitrarily large or invalid filter payloads. Each request causes memory to be allocated for the malformed topic filter, but the broker does not free the associated memory, leading to unbounded heap growth and potential denial of service under sustained attack.

