CVE-2020-15135 Information

Description

save-server (npm package) before version 1.05 is affected by a CSRF vulnerability as there is no CSRF mitigation (Tokens etc.). The fix introduced in version version 1.05 unintentionally breaks uploading so version v1.0.7 is the fixed version. This is patched by implementing Double submit. The CSRF attack would require you to navigate to a malicious site while you have an active session with Save-Server (Session key stored in cookies). The malicious user would then be able to perform some actions including uploading/deleting files and adding redirects. If you are logged in as root this attack is significantly more severe. They can in addition create delete and update users. If they updated the password of a user that user’s files would then be available. If the root password is updated all files would be visible if they logged in with the new password. Note that due to the same origin policy malicious actors cannot view the gallery or the response of any of the methods nor be sure they succeeded. This issue has been patched in version 1.0.7.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:L

Reference

https://github.com/Neztore/save-server/security/advisories/GHSA-wwrj-35w6-77ff https://medium.com/cross-site-request-forgery-csrf/double-submit-cookie-pattern-65bb71d80d9f https://www.npmjs.com/package/save-server

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

REQUIRED

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

LOW

Base Severity

7.6