SB2021101103 - Information disclosure in BookStack

Description

This security bulletin contains information about 1 vulnerability.

1) Security restrictions bypass (CVE-ID: CVE-2021-3874)

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a remote user to gain access to sensitive information.

The vulnerability exists due to application does not properly impose security restrictions on HTML export system. A remote authenticated user with permission to update or create pages can export content from files stored within the storage/</code> or <code>public/ directories (Such as application logs).

Remediation

Install update from vendor's website.

References

• https://github.com/BookStackApp/BookStack/releases/tag/v21.08.5
• https://github.com/bookstackapp/bookstack/commit/7224fbcc89f00f2b71644e36bb1b1d96addd1d5a
• https://huntr.dev/bounties/ac268a17-72b5-446f-a09a-9945ef58607a