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Security Advisories: MDE2OlNlY3VyaXR5QWR2aXNvcnlHSFNBLWc5cnEteDRmai1mNWh4

Remote Code Execution Through Image Uploads in BookStack

Impact

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.

Patches

The issue was addressed in a series of patches: v0.25.3, v0.25.4 and v0.25.5.
Users should upgrade to at least v0.25.5 to avoid this patch but ideally the latest BookStack version as previous versions are un-supported.

Workarounds

Depending on BookStack version, you could use the local_secure image storage option, or use s3 or a similar compatible service.

Preventing direct execution of any php files, apart from the public/index.php file, though web-server configuration would also prevent this.

References

BookStack Beta v0.25.3
BookStack Beta v0.25.4
BookStack Beta v0.25.5

For more information

If you have any questions or comments about this advisory:

Permalink: https://github.com/advisories/GHSA-g9rq-x4fj-f5hx
JSON: https://advisories.ecosyste.ms/api/v1/advisories/MDE2OlNlY3VyaXR5QWR2aXNvcnlHSFNBLWc5cnEteDRmai1mNWh4
Source: GitHub Advisory Database
Origin: Unspecified
Severity: High
Classification: General
Published: over 4 years ago
Updated: almost 2 years ago


CVSS Score: 7.9
CVSS vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:L

Identifiers: GHSA-g9rq-x4fj-f5hx, CVE-2020-5256
References: Repository: https://github.com/BookStackApp/BookStack
Blast Radius: 1.0

Affected Packages

packagist:ssddanbrown/bookstack
Dependent packages: 0
Dependent repositories: 0
Downloads: 116 total
Affected Version Ranges: < 0.25.3
Fixed in: 0.25.5
All affected versions: 0.5.0, 0.6.0, 0.6.1, 0.6.2, 0.6.3, 0.7.0, 0.7.2, 0.7.3, 0.7.4, 0.7.6, 0.8.0, 0.8.1, 0.8.2, 0.9.0, 0.9.1, 0.9.2, 0.9.3, 0.10.0, 0.11.0, 0.11.1, 0.11.2, 0.12.0, 0.12.1, 0.12.2, 0.13.0, 0.13.1, 0.14.0, 0.14.1, 0.14.2, 0.14.3, 0.15.0, 0.15.1, 0.15.2, 0.15.3, 0.16.0, 0.16.1, 0.16.2, 0.16.3, 0.17.0, 0.17.1, 0.17.2, 0.17.3, 0.17.4, 0.18.0, 0.18.1, 0.18.2, 0.18.3, 0.18.4, 0.18.5, 0.19.0, 0.20.0, 0.20.1, 0.20.2, 0.20.3, 0.21.0, 0.22.0, 0.23.0, 0.23.1, 0.23.2, 0.24.0, 0.24.1, 0.24.2, 0.24.3, 0.25.0, 0.25.1, 0.25.2
All unaffected versions: 0.25.3, 0.25.4, 0.25.5, 0.26.0, 0.26.1, 0.26.2, 0.26.3, 0.26.4, 0.27.1, 0.27.2, 0.27.3, 0.27.4, 0.27.5, 0.28.0, 0.28.1, 0.28.2, 0.28.3, 0.29.0, 0.29.1, 0.29.2, 0.29.3, 0.30.0, 0.30.1, 0.30.2, 0.30.3, 0.30.4, 0.30.5, 0.30.6, 0.30.7, 0.31.0, 0.31.1, 0.31.2, 0.31.3, 0.31.4, 0.31.5, 0.31.6, 0.31.7, 0.31.8, 21.4.1, 21.4.2, 21.4.3, 21.4.4, 21.4.5, 21.4.6, 21.5.1, 21.5.2, 21.5.3, 21.5.4, 21.8.1, 21.8.2, 21.8.3, 21.8.4, 21.8.5, 21.8.6, 21.10.1, 21.10.2, 21.10.3, 21.11.1, 21.11.2, 21.11.3, 21.12.1, 21.12.2, 21.12.3, 21.12.4, 21.12.5, 22.2.1, 22.2.2, 22.2.3, 22.3.1, 22.4.1, 22.4.2, 22.6.1, 22.6.2, 22.7.1, 22.7.2, 22.7.3, 22.9.1, 22.10.1, 22.10.2, 22.11.1, 23.1.1, 23.2.1, 23.2.2, 23.2.3, 23.5.1, 23.5.2, 23.6.1, 23.6.2, 23.8.1, 23.8.2, 23.8.3, 23.10.1, 23.10.2, 23.10.3, 23.10.4, 23.12.1, 23.12.2, 23.12.3, 24.2.1, 24.2.2, 24.2.3, 24.5.1, 24.5.2, 24.5.3, 24.5.4