CVE-2024-25623 Lack of media type verification of Activity Streams objects allows impersonation of remote accounts
Attackers can impersonate remote accounts by exploiting missing media type verification in Mastodon's Activity Streams fetching logic.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2024-25623?
CVE-2024-25623 is a high-severity vulnerability in mastodon, published on 19 Feb 2024. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-434
Which versions are affected by CVE-2024-25623?
1 open source package ship an affected version, including mastodon. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
mastodon Bitnami | All versions | 3.5.19, 4.0.15, 4.1.15, 4.2.7 |
Products include Joinmastodon Mastodon.
How do I fix CVE-2024-25623?
Upgrade mastodon to a fixed version for your release line: 3.5.19, 4.0.15, 4.1.15 or 4.2.7.
Is CVE-2024-25623 being exploited?
There is no known exploitation of CVE-2024-25623 in the wild and no public exploit code.
Other vulnerabilities in mastodon
- CVE-2023-36460 Mastodon vulnerable to arbitrary file creation through media attachments
- CVE-2022-2166 Improper Restriction of Excessive Authentication Attempts in mastodon/mastodon
- CVE-2022-24307 Missing authorization in n/a
- CVE-2018-21018 Auth bypass in n/a
- CVE-2024-23832 Mastodon Remote user impersonation and takeover
Sources
Also known as BIT-mastodon-2024-25623, GHSA-jhrq-qvrm-qr36.