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CVE-2024-49363— Uncontrolled Recursion and Asymmetric Resource Consumption (Amplification) in media/file proxy in Misskey

Quick assessment

Affected
misskey-dev misskey
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Misskey是Misskey开源的一个永久免费的开源联合社交媒体平台。 Misskey 2024.10.1及之前版本存在安全漏洞，该漏洞源于未检测到代理循环，允许远程参与者通过恶意制作的注释执行自传播反射/放大分布式拒绝服务。

CVSS 7.4 · High EPSS 0.32% · P24

Possible ATT&CK Techniques 1 AI

T1498 · Network Denial of Service
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I. Basic Information for CVE-2024-49363

Vulnerability Information
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Vulnerability Title
Uncontrolled Recursion and Asymmetric Resource Consumption (Amplification) in media/file proxy in Misskey
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不对称的资源消耗(放大攻击)
Source: CVE Program / CVE List V5
Vulnerability Title
Misskey 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Misskey是Misskey开源的一个永久免费的开源联合社交媒体平台。 Misskey 2024.10.1及之前版本存在安全漏洞，该漏洞源于未检测到代理循环，允许远程参与者通过恶意制作的注释执行自传播反射/放大分布式拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
misskey-dev misskey < CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:N/A:H -

II. Public POCs for CVE-2024-49363

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 9602 chars
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III. Intelligence Information for CVE-2024-49363

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Vendor Advisories for CVE-2024-49363 (1)

Same Patch Batch · misskey-dev · 2024-12-18 · 6 CVEs total

CVE-2024-52579 6.4 MEDIUM Server-Side Request Forgery vulnerability in various APIs in Misskey
CVE-2024-52590 Missing validation allows spoofed profiles in Misskey
CVE-2024-52593 Missing validation allows spoofed "origin" links in Misskey
CVE-2024-52592 Missing validation allows spoofed poll updates in Misskey
CVE-2024-52591 Missing validation allows spoofed profiles and notes in Misskey

IV. Related Vulnerabilities

Same product: misskey
Same vendor: misskey-dev
Same weakness: CWE-405

V. Comments for CVE-2024-49363

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