Cross-site request forgery in BookStack



| Updated: 2021-11-05
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-3758
CWE-ID CWE-918
Exploitation vector Network
Public exploit Public exploit code for vulnerability #1 is available.
Vulnerable software
 BookStack
Client/Desktop applications / Other client software

Vendor Dan Brown

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Server-Side Request Forgery (SSRF)

EUVDB-ID: #VU56238

Risk: Medium

CVSSv4.0: 2.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N/E:P/U:Green]

CVE-ID: CVE-2021-3758

CWE-ID: CWE-918 - Server-Side Request Forgery (SSRF)

Exploit availability: No

Description

The disclosed vulnerability allows a remote user to perform SSRF attacks.

The vulnerability exists due to insufficient validation of user-supplied input in the PDF export feature. A remote user can send a specially crafted HTTP request and trick the application to initiate requests to arbitrary systems.

Successful exploitation of this vulnerability may allow a remote attacker gain access to sensitive data, located in the local network or send malicious requests to other servers from the vulnerable system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

BookStack: 0.5.0 - 21.05.4

CPE2.3 External links

https://github.com/BookStackApp/BookStack/releases/tag/v21.08
https://huntr.dev/bounties/a8d7fb24-9a69-42f3-990a-2db93b53f76b/
https://github.com/bookstackapp/bookstack/commit/bee5e2c7ca637d034c6985c0328cef0ce068778e


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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