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CVE

CVE-2023-36460

Mastodon is a free, open-source social network server based on ActivityPub. Starting in version 3.5.0 and prior to versi

Mastodon is a free, open-source social network server based on ActivityPub. Starting in version 3.5.0 and prior to versions 3.5.9, 4.0.5, and 4.1.3, attackers using carefully crafted media files can cause Mastodon's media processing code to create arbitrary files at any location. This allows attackers to create and overwrite any file Mastodon has access to, allowing Denial of Service and arbitrary Remote Code Execution.

Versions 3.5.9, 4.0.5, and 4.1.3 contain a patch for this issue.

CRITICAL · CVSS 9.9 EPSS 0.42253
Schedule remediation
  • EPSS ≥ 0.10 - elevated exploitation probability
  • EPSS percentile: top 2% of all CVEs by exploitation likelihood
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
▤

Affected Products & Versions

3
joinmastodon mastodon>= 3.5.0 and < 3.5.9
joinmastodon mastodon>= 4.0.0 and < 4.0.5
joinmastodon mastodon>= 4.1.0 and < 4.1.3
▣

Scoring & Timeline

9.9
CRITICAL · CVSS v3.1 · security-advisories@github.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD06 Jul 2023 · 07:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
no
Technical impact
total
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
🔗

References & Sources

6
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
http://www.openwall.com/lists/oss-security/2023/07/06/4Mailing List
https://github.com/mastodon/mastodon/commit/dc8f1fbd976ae544720a4e07120d9a91b2722440PatchThird Party Advisory
https://github.com/mastodon/mastodon/releases/tag/v3.5.9Third Party Advisory
https://github.com/mastodon/mastodon/releases/tag/v4.0.5Third Party Advisory
https://github.com/mastodon/mastodon/releases/tag/v4.1.3Third Party Advisory
https://github.com/mastodon/mastodon/security/advisories/GHSA-9928-3cp5-93fmThird Party Advisory
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