We use these services and cookies to improve your user experience. You may opt out if you wish, however, this may limit some features on this site.

Please see our statement on Data Privacy.

Crisp.chat (Helpdesk and Chat)

Ok

THREATINT
PUBLISHED

CVE-2025-31161



Description

CrushFTP 10 before 10.8.4 and 11 before 11.3.1 allows authentication bypass and takeover of the crushadmin account (unless a DMZ proxy instance is used), as exploited in the wild in March and April 2025, aka "Unauthenticated HTTP(S) port access." A race condition exists in the AWS4-HMAC (compatible with S3) authorization method of the HTTP component of the FTP server. The server first verifies the existence of the user by performing a call to login_user_pass() with no password requirement. This will authenticate the session through the HMAC verification process and up until the server checks for user verification once more. The vulnerability can be further stabilized, eliminating the need for successfully triggering a race condition, by sending a mangled AWS4-HMAC header. By providing only the username and a following slash (/), the server will successfully find a username, which triggers the successful anypass authentication process, but the server will fail to find the expected SignedHeaders entry, resulting in an index-out-of-bounds error that stops the code from reaching the session cleanup. Together, these issues make it trivial to authenticate as any known or guessable user (e.g., crushadmin), and can lead to a full compromise of the system by obtaining an administrative account.

Reserved 2025-03-27 | Published 2025-04-03 | Updated 2025-04-21 | Assigner mitre


CRITICAL: 9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA Known Exploited Vulnerability

Date added 2025-04-07 | Due date 2025-04-28

Known Ransomware Campaign(s)

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Problem types

CWE-305 Authentication Bypass by Primary Weakness

Product status

Default status
unaffected

10 before 10.8.4
affected

11 before 11.3.1
affected

Credits

Kristian Varnai, Outpost24 finder

Marcus White, Outpost24 finder

References

outpost24.com/blog/crushftp-auth-bypass-vulnerability/

crushftp.com/crush11wiki/Wiki.jsp?page=Update

cve.org (CVE-2025-31161)

nvd.nist.gov (CVE-2025-31161)

Download JSON

Share this page
https://cve.threatint.eu/CVE/CVE-2025-31161

Support options

Helpdesk Chat, Email, Knowledgebase