CVE-2024-49363
HighSummary
Misskey to otwartoźródłowa, federacyjna platforma mediów społecznościowych. W dotkniętych wersjach FileServerService (proxy multimedialne) nie wykrywało pętli proxy, co pozwalało zdalnym atakującym na przeprowadzenie rozproszonego ataku typu denial-of-service poprzez złośliwie skonstruowaną notatkę.
Risk Assessment
Atakujący może wykorzystać tę podatność do przeprowadzenia amplifikowanego ataku denial-of-service, co prowadzi do nieograniczonej rekurencji i ostatecznie do wyczerpania zasobów serwera. To może poważnie wpłynąć na dostępność usług dla użytkowników.
Recommendation
Zaleca się aktualizację do wersji 2024.11.0-alpha.3 lub nowszej. Użytkownicy, którzy nie mogą zaktualizować, powinni skonfigurować reverse proxy, aby blokować żądania do proxy z pustym nagłówkiem User-Agent lub takim, który zawiera 'Misskey/'.
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Original NVD description (English source)
Misskey is an open source, federated social media platform. In affected versions FileServerService (media proxy) in github.com/misskey-dev/misskey 2024.10.1 or earlier did not detect proxy loops, which allows remote actors to execute a self-propagating reflected/amplified distributed denial-of-service via a maliciously crafted note. FileServerService.prototype.proxyHandler did not check incoming requests are not coming from another proxy server. An attacker can execute an amplified denial-of-service by sending a nested proxy request to the server and end the request with a malicious redirect back to another nested proxy request. Leading to unbounded recursion until the original request is timed out. This issue has been addressed in version 2024.11.0-alpha.3. Users are advised to upgrade. Users unable to upgrade may configure the reverse proxy to block requests to the proxy with an empty User-Agent header or one containing Misskey/. An attacker can not effectively modify the User-Agent
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

