CVE-2024-23832 Mastodon Remote user impersonation and takeover

What is CVE-2024-23832?

CVE-2024-23832 is a critical authentication bypass vulnerability in mastodon, published on 1 Feb 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Mastodon is a free, open-source social network server based on ActivityPub Mastodon allows configuration of LDAP for authentication. Due to insufficient origin validation in all Mastodon, attackers can impersonate and take over any remote account. Every Mastodon version prior to 3.5.17 is vulnerable, as well as 4.0.x versions prior to 4.0.13, 4.1.x version prior to 4.1.13, and 4.2.x versions prior to 4.2.5.

Weakness: CWE-290

Which versions are affected by CVE-2024-23832?

1 open source package ship an affected version, including mastodon. It affects 1 product.

Products include Joinmastodon Mastodon.

How do I fix CVE-2024-23832?

Upgrade mastodon to a fixed version for your release line: 3.5.17, 4.0.13, 4.1.13 or 4.2.5.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2024-23832 being exploited?

There is no known exploitation of CVE-2024-23832 in the wild and no public exploit code.

Other vulnerabilities in mastodon

• CVE-2023-36460 Mastodon vulnerable to arbitrary file creation through media attachments Critical 10.0
• CVE-2022-2166 Improper Restriction of Excessive Authentication Attempts in mastodon/mastodon Critical 9.8
• CVE-2022-24307 Missing authorization in n/a Critical 9.8
• CVE-2018-21018 Auth bypass in n/a Critical 9.8
• CVE-2023-36459 Mastodon vulnerable to Cross-site Scripting through oEmbed preview cards Critical 9.3

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BIT-mastodon-2024-23832, GHSA-3fjr-858r-92rw.