Attacker Value
Very High
(1 user assessed)
Exploitability
Moderate
(1 user assessed)
User Interaction
None
Privileges Required
None
Attack Vector
Network
1

CVE-2021-27101

Disclosure Date: February 16, 2021
Exploited in the Wild
Add MITRE ATT&CK tactics and techniques that apply to this CVE.

Description

Accellion FTA 9_12_370 and earlier is affected by SQL injection via a crafted Host header in a request to document_root.html. The fixed version is FTA_9_12_380 and later.

Add Assessment

3
Ratings
  • Attacker Value
    Very High
  • Exploitability
    Medium
Technical Analysis

Accellion’s legacy File Transfer Appliance (FTA) is an application to transfer large files securely. It is a 20-year-old product and will reach End of Life on April 30, 2021. Accellion recommends to migrate to kiteworks, its enterprise content firewall platform. According to this post, the SQL injection vulnerability is the starting point of a series of attacks against multiple organizations. This post reports that this vulnerability has been actively exploited since mid-December 2020 and is related to an ongoing ransomware campaign.

This SQL injection vulnerability enables an unauthenticated remote attacker to retrieve data from the database by sending specially crafted requests to the document_root file. Especifically, it has been exploited to retrieve a key that led to the installation of a web shell on the appliance. This web shell was then used to download sensitive data from the FTA internal database.

Due to the nature of this application, the data available is likely to be very sensitive and exploiting this vulnerability would lead to a critical information leak. As an emergency mitigation, external access to any vulnerable FTA should be shut down. However, this won’t block attacks coming from the internal network. It is highly recommended to patch to the latest version and to consider migrating to kiteworks.

CVSS V3 Severity and Metrics
Base Score:
9.8 Critical
Impact Score:
5.9
Exploitability Score:
3.9
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector (AV):
Network
Attack Complexity (AC):
Low
Privileges Required (PR):
None
User Interaction (UI):
None
Scope (S):
Unchanged
Confidentiality (C):
High
Integrity (I):
High
Availability (A):
High

General Information

Exploited in the Wild

Reported by:
Reported: March 03, 2021 6:11pm UTC (1 month ago)

Additional Info

Technical Analysis