Vulnerability identifier: #VU69421

Vulnerability risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: N/A

CWE-ID: CWE-125

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Mastodon
Server applications / Other server solutions

Vendor: Mastodon

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to a boundary condition in blurhash transcoder. A remote attacker can trigger out-of-bounds read error and read contents of memory on the system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Mastodon: 3.4.0 - 3.4.8, 3.5.0 - 3.5.3

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External links
http://github.com/mastodon/mastodon/releases/tag/v4.0.0
http://github.com/mastodon/mastodon/releases/tag/v3.4.9
http://github.com/mastodon/mastodon/releases/tag/v3.5.4

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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.