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CVE-2024-36403— Denial of service/high operating costs through unauthenticated downloads in Matrix Media Repo

Quick assessment

Affected
t2bot matrix-media-repo
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Matrix是一个雄心勃勃的新生态系统，用于开放联合即时消息和 VoIP。 Matrix存在安全漏洞，该漏洞源于磁盘消耗不受控制，从而导致拒绝服务。

CVSS 5.3 · Medium EPSS 0.71% · P53

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2024-36403

Vulnerability Information
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Vulnerability Title
Denial of service/high operating costs through unauthenticated downloads in Matrix Media Repo
Source: CVE Program / CVE List V5
Vulnerability Description
Matrix Media Repo (MMR) is a highly configurable multi-homeserver media repository for Matrix. MMR before version 1.3.5 is vulnerable to unbounded disk consumption, where an unauthenticated adversary can induce it to download and cache large amounts of remote media files. MMR's typical operating environment uses S3-like storage as a backend, with file-backed store as an alternative option. Instances using a file-backed store or those which self-host an S3 storage system are therefore vulnerable to a disk fill attack. Once the disk is full, authenticated users will be unable to upload new media, resulting in denial of service. For instances configured to use a cloud-based S3 storage option, this could result in high service fees instead of a denial of service. MMR 1.3.5 introduces a new default-on "leaky bucket" rate limit to reduce the amount of data a user can request at a time. This does not fully address the issue, but does limit an unauthenticated user's ability to request large amounts of data. Operators should note that the leaky bucket implementation introduced in MMR 1.3.5 requires the IP address associated with the request to be forwarded, to avoid mistakenly applying the rate limit to the reverse proxy instead. To avoid this issue, the reverse proxy should populate the X-Forwarded-For header when sending the request to MMR. Operators who cannot update may wish to lower the maximum file size they allow and implement harsh rate limits, though this can still lead to a large amount of data to be downloaded.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
Matrix 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Matrix是一个雄心勃勃的新生态系统，用于开放联合即时消息和 VoIP。 Matrix存在安全漏洞，该漏洞源于磁盘消耗不受控制，从而导致拒绝服务。
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
t2bot matrix-media-repo < 1.3.5 -

II. Public POCs for CVE-2024-36403

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III. Intelligence Information for CVE-2024-36403

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Vendor Advisories for CVE-2024-36403 (1)

Other References for CVE-2024-36403 (1)

Same Patch Batch · t2bot · 2025-01-16 · 5 CVEs total

CVE-2024-56515 6.8 MEDIUM Untrusted file formats can be thumbnailed, invoking potentially further untrusted decoders
CVE-2024-36402 5.3 MEDIUM Unauthenticated writes to the media repository allow planting of problematic content in Ma
CVE-2024-52791 5.3 MEDIUM Denial of service through memory exhaustion in Matrix Media Repo
CVE-2024-52602 5.0 MEDIUM Server-Side Request Forgery (SSRF) on redirects and federation in Matrix Media Repo

IV. Related Vulnerabilities

Same product: matrix-media-repo
Same vendor: t2bot
Same weakness: CWE-770