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CVE-2024-25623— Lack of media type verification of Activity Streams objects allows impersonation of remote accounts

Quick assessment

Affected
mastodon mastodon
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.

Mastodon是一款基于ActivityPub的开源社交网络服务器。 Mastodon v4.2.6版本及之前版本存在代码问题漏洞，该漏洞源于获取远程状态时，不会检查远程服务器的响应是否具有标头值。

CVSS 8.5 · High EPSS 0.51% · P41
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I. Basic Information for CVE-2024-25623

Vulnerability Information
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Vulnerability Title
Lack of media type verification of Activity Streams objects allows impersonation of remote accounts
Source: CVE Program / CVE List V5
Vulnerability Description
Mastodon is a free, open-source social network server based on ActivityPub. Prior to versions 4.2.7, 4.1.15, 4.0.15, and 3.5.19, when fetching remote statuses, Mastodon doesn't check that the response from the remote server has a `Content-Type` header value of the Activity Streams media type, which allows a threat actor to upload a crafted Activity Streams document to a remote server and make a Mastodon server fetch it, if the remote server accepts arbitrary user uploads. The vulnerability allows a threat actor to impersonate an account on a remote server that satisfies all of the following properties: allows the attacker to register an account; accepts arbitrary user-uploaded documents and places them on the same domain as the ActivityPub actors; and serves user-uploaded document in response to requests with an `Accept` header value of the Activity Streams media type. Versions 4.2.7, 4.1.15, 4.0.15, and 3.5.19 contain a fix for this issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
危险类型文件的不加限制上传
Source: CVE Program / CVE List V5
Vulnerability Title
Mastodon 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mastodon是一款基于ActivityPub的开源社交网络服务器。 Mastodon v4.2.6版本及之前版本存在代码问题漏洞，该漏洞源于获取远程状态时，不会检查远程服务器的响应是否具有标头值。
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
mastodon mastodon < 3.5.19 -

II. Public POCs for CVE-2024-25623

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III. Intelligence Information for CVE-2024-25623

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Patches & Fixes for CVE-2024-25623 (1)

Vendor Advisories for CVE-2024-25623 (1)

IV. Related Vulnerabilities

Same product: mastodon
Same vendor: mastodon
Same weakness: CWE-434

V. Comments for CVE-2024-25623

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