CVE-2025-31161

Basic Information

CVE State

PUBLISHED

Reserved Date

March 27, 2025

Published Date

April 03, 2025

Last Updated

April 21, 2025

Vendor

CrushFTP

Product

CrushFTP

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.

Tags

cisa malware ransomware nuclei_scanner nessus_scanner

CVSS Scores

EPSS Score

Score

22.59% (Percentile: 95.48%) as of 2025-05-05

SSVC Information

Exploitation

active

Automatable

Yes

Technical Impact

total

Exploit Status

Exploited in the Wild

Yes (2025-04-07 00:00:00 UTC) Source

Proof of Concept Available

Yes (added 2025-04-24 22:09:24 UTC) Source

Used in Malware

Yes (added 2025-04-07 00:00:00 UTC) Source