Mastodon is a self-hosted, federated microblogging platform. In versions prior to 4.1.23, 4.2.16, and 4.3.4, when the visibility for domain blocks/reasons is set to "users" (localized English string: "To logged-in users"), users that are not yet approved can view the block reasons. Instance admins that do not want their domain blocks to be public are impacted.
Versions 4.1.23, 4.2.16, and 4.3.4 fix the issue.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
Low
Partial data leak
Integrity
None
No data modification
Availability
None
No disruption
CVSS Vector v3.1
Weakness Type (CWE)
Vulnerable Products 3
| Configuration | From (including) | Up to (excluding) |
|---|---|---|
|
Joinmastodon Mastodon
cpe:2.3:a:joinmastodon:mastodon:*:*:*:*:*:*:*:*
|
— |
4.1.23
|
|
Joinmastodon Mastodon
cpe:2.3:a:joinmastodon:mastodon:*:*:*:*:*:*:*:*
|
4.2.0
|
4.2.16
|
|
Joinmastodon Mastodon
cpe:2.3:a:joinmastodon:mastodon:*:*:*:*:*:*:*:*
|
4.3.0
|
4.3.4
|
References 4
https://github.com/mastodon/mastodon/blob/93f0427b8a84faf68d5d02cdf9a26f98fae16…
security-advisories@github.com
https://github.com/mastodon/mastodon/blob/93f0427b8a84faf68d5d02cdf9a26f98fae16…
security-advisories@github.com
https://github.com/mastodon/mastodon/commit/6b519cfefa93a923b19d0f20c292c7185f8…
security-advisories@github.com
https://github.com/mastodon/mastodon/security/advisories/GHSA-94h4-fj37-c825
security-advisories@github.com