CVE-2020-5256
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.97%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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 3.1
- 8.8 HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 1.97% probability · 79th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-95, CWE-434
- Affected
- bookstackapp/bookstack
- Source
- security-advisories@github.com
References
- https://github.com/BookStackApp/BookStack/releases/tag/v0.25.3Release Notes
- https://github.com/BookStackApp/BookStack/releases/tag/v0.25.4Release Notes
- https://github.com/BookStackApp/BookStack/releases/tag/v0.25.5Release Notes
- https://github.com/BookStackApp/BookStack/security/advisories/GHSA-g9rq-x4fj-f5hxThird Party Advisory
- https://github.com/BookStackApp/BookStack/releases/tag/v0.25.3Release Notes
- https://github.com/BookStackApp/BookStack/releases/tag/v0.25.4Release Notes
- https://github.com/BookStackApp/BookStack/releases/tag/v0.25.5Release Notes
- https://github.com/BookStackApp/BookStack/security/advisories/GHSA-g9rq-x4fj-f5hxThird Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.