External risk intelligence

Accellion FTA SSRF Vulnerability.

CVE advisoryKnown Exploit

CVE-2021-27103

Accellion FTA software versions prior to 9.12.416 are affected by a Server-Side Request Forgery vulnerability. This can allow an attacker to trick the system into making unintended requests, potentially exposing sensitive data or granting unauthorized system access. The realistic business risk includes data compromise,

5Halo Surface Signal

Server-Side Request Forgery

Accellion Fta

before 9_12_416

External exposure likelihood

Halo Surface Signal score for CVE-2021-27103

Accellion FTA (File Transfer Appliance) is an internet-facing gateway product specifically designed to facilitate external data exchange and file transfers. By its nature and deployment model, this product acts as an internet-edge service, making it public-facing by design in normal use.

Horizon Alert

Summary of the vulnerability and why it matters

Accellion's FTA software, specifically versions prior to 9.12.416, is susceptible to a flaw that allows attackers to manipulate its request handling. This weakness can enable unauthorized access to internal systems or resources. The potential impact on an organization could include compromised data integrity, unauthorized system modifications, and exposure of sensitive information.

  • Vulnerable: Accellion FTA software
  • Weakness: Server-side request forgery
  • Impact: Data compromise and system access

Attack Path

How an attacker could exploit the issue

This vulnerability allows an attacker to trick an affected system into making unintended requests to internal or external resources. This can expose sensitive information or grant unauthorized access to other systems. The attack begins when an attacker sends a specifically crafted POST request to a particular file within the application. If successful, this action could lead to the attacker gaining control over certain functions of the affected system.

  • External network access required.
  • Attacker sends a POST request.
  • Results in system control.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability allows for unauthorized access to internal systems and data through a crafted request. Exploitation could lead to significant data breaches, service disruptions, and reputational damage for affected organizations. Given the severity and the potential for widespread impact, organizations using the affected product should prioritize remediation.

  • Likely attacker skill level: High.
  • Required access or conditions: Network access.
  • Business risk or urgency: Critical.

Priority actions

Operational Fix

Recommended remediation, mitigation, and detection steps

This vulnerability allows an unauthenticated attacker to send a crafted request to an affected system. This could enable the attacker to access internal resources or systems. Organizations using the affected product should take immediate steps to address this risk.

  • Identify all instances of the affected product.
  • Reduce exposure by limiting network access.
  • Apply vendor updates and verify the fix.
  • Monitor for related malicious activity.

Frequently asked questions

What is Accellion FTA software?

Accellion FTA (File Transfer Appliance) is a software product used for secure external data exchange and file transfers.

What type of vulnerability does CVE-2021-27103 describe?

CVE-2021-27103 describes a Server-Side Request Forgery (SSRF) vulnerability in Accellion FTA.

How can CVE-2021-27103 be triggered?

This vulnerability can be triggered by sending a specifically crafted POST request to the wmProgressstat.html file within the affected application.

What is the potential impact of this SSRF vulnerability?

An attacker could exploit this flaw to trick the affected system into making unintended requests, potentially exposing sensitive information or granting unauthorized access to internal or external resources.

What is the recommended action for Accellion FTA versions affected by CVE-2021-27103?

Organizations using affected versions of Accellion FTA should apply vendor updates, specifically upgrading to FTA version 9.12.416 or later, and verify that the fix has been successfully applied.

References