CVE-2020-5256 Information

Description

BookStack before version 0.25.5 has a vulnerability where a user could upload PHP files through image upload functions which would allow them to execute code on the host system remotely. They would then have the permissions of the PHP process. This most impacts scenarios where non-trusted users are given permission to upload images in any area of the application. The issue was addressed in a series of patches in versions 0.25.3 0.25.4 and 0.25.5. Users should upgrade to at least v0.25.5 to avoid this vulnerability.

CVSS Vector

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

Reference

https://github.com/BookStackApp/BookStack/releases/tag/v0.25.3 https://github.com/BookStackApp/BookStack/releases/tag/v0.25.4 https://github.com/BookStackApp/BookStack/releases/tag/v0.25.5 https://github.com/BookStackApp/BookStack/security/advisories/GHSA-g9rq-x4fj-f5hx

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

8.8