CVE-2024-49363
Uncontrolled Recursion and Asymmetric Resource Consumption (Amplification) in media/file proxy in Misskey
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Uncontrolled Recursion and Asymmetric Resource Consumption (Amplification) in media/file proxy in Misskey
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 header without making another request to the server.
Reserved 2024-10-14 | Published 2024-12-18 | Updated 2024-12-19 | Assigner GitHub_MCWE-405: Asymmetric Resource Consumption (Amplification)
CWE-674: Uncontrolled Recursion
github.com/...isskey/security/advisories/GHSA-gq5q-c77c-v236
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