Vulnerability identifier: #VU78044

Vulnerability risk: Medium

CVSSv3.1: 4.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-36462

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Mastodon
Server applications / Other server solutions

Vendor: Mastodon

Description

The vulnerability allows a remote attacker to compromise the target system.

The vulnerability exists due to insufficient validation of user-supplied input. A remote attacker can craft a verified profile link using specific formatting to conceal arbitrary parts of the link, enabling it to appear to link to a different URL altogether.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Mastodon: 2.9.0 - 2.9.4, 2.8.0 - 2.8.4, 2.7.0 - 2.7.4, 2.6.0 - 2.6.5, 3.5.0 - 3.5.8, 3.4.0 - 3.4.10, 3.3.0 - 3.3.3, 3.2.0 - 3.2.2, 3.1.0 - 3.1.5, 3.0.0 - 3.0.2, 4.1.0 - 4.1.2, 4.0.0 - 4.0.4

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External links
http://github.com/mastodon/mastodon/commit/610731b03dfcadd887078cb0399f4e514aa1931c
http://github.com/mastodon/mastodon/releases/tag/v3.5.9
http://github.com/mastodon/mastodon/releases/tag/v4.0.5
http://github.com/mastodon/mastodon/security/advisories/GHSA-55j9-c3mp-6fcq
http://github.com/mastodon/mastodon/releases/tag/v4.1.3

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.