PT-2020-18350 · Bookstack · Bookstack

Inc0X0 + 1 · Published 2020-03-09 · Updated 2020-10-13 · CVE-2020-5256

Positive Technologies (AI Summary)

CVSS v2.0

9.0

High

Base vector

AV:N/AC:L/Au:S/C:C/I:C/A:C

Name of the Vulnerable Software and Affected Versions BookStack versions prior to 0.25.5

Description 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.

Recommendations For BookStack versions prior to 0.25.5, upgrade to at least version 0.25.5 to avoid this issue. As a temporary workaround, consider using the local secure image storage option, or use s3 or a similar compatible service. Prevent direct execution of any php files, apart from the public/index.php file, through web-server configuration.

Fix

Unrestricted File Upload

Eval Injection

Weakness Enumeration

CWE-434

CWE-95

Related Identifiers

CVE-2020-5256

GHSA-G9RQ-X4FJ-F5HX

Affected Products

Bookstack

References · 9

• https://osv.dev/vulnerability/GHSA-g9rq-x4fj-f5hx · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2020-5256 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2020-5256 · Security Note
• https://github.com/BookStackApp/BookStack/releases/tag/v0.25.5 · Note
• https://github.com/BookStackApp/BookStack/releases/tag/v0.25.4 · Note
• https://github.com/BookStackApp/BookStack/releases/tag/v0.25.3 · Note
• https://github.com/BookStackApp/BookStack/security/advisories/GHSA-g9rq-x4fj-f5hx · Note
• https://t.me/cvenotify/1417 · Telegram Post
• https://t.me/ckure/5761 · Telegram Post