External risk intelligence

Accellion FTA OS Command Execution Vulnerability

CVE advisoryKnown Exploit

CVE-2021-27102

Accellion FTA versions prior to 9.12.416 allow OS command execution through a local web service call. This vulnerability matters because unauthorized commands can be run on affected systems, posing a business risk of system compromise and potential data exfiltration.

1Halo Surface Signal

OS Command Injection

Accellion Fta

9_12_411 and earlier

External exposure likelihood

Halo Surface Signal score for CVE-2021-27102

The vulnerability involves OS command execution via a local web service call, which typically requires authenticated local access or interaction with internal-only service interfaces rather than direct exposure to the public internet.

Horizon Alert

Summary of the vulnerability and why it matters

Accellion FTA software versions prior to 9.12.416 contain a vulnerability that allows for the execution of operating system commands. This flaw exists within a local web service call, potentially impacting the integrity and availability of affected systems. The successful exploitation of this weakness could lead to significant business risk through unauthorized access and control.

  • Vulnerable component: Accellion FTA software
  • Core weakness: OS command execution via local web service
  • Main business impact: Unauthorized system control

Attack Path

How an attacker could exploit the issue

This vulnerability allows an attacker to execute operating system commands through a local web service. An attacker with local access could exploit this by making a specific web service call. Successful exploitation could lead to unauthorized command execution on the affected system.

  • Local access is required.
  • Attacker makes a web service call.
  • OS commands are executed.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability in Accellion FTA allows for the execution of operating system commands through a local web service. The exploitation requires an attacker to have some level of local access to the affected system. Successful exploitation could lead to unauthorized command execution, potentially resulting in significant data compromise and system disruption. Given the nature of the exploit and the potential for severe impact, organizations should prioritize addressing this vulnerability.

  • Likely attacker skill level: Low
  • Required access or conditions: Local system access
  • Business risk or urgency: High

Priority actions

Operational Fix

Recommended remediation, mitigation, and detection steps

This vulnerability impacts Accellion FTA software, potentially allowing unauthorized command execution on affected systems. Organizations should take immediate steps to identify all instances of the vulnerable software and assess their exposure. The risk can be mitigated by implementing vendor-provided updates. Following these actions, ongoing monitoring is advised to detect any related security events.

  • Find all affected Accellion FTA assets.
  • Limit access to or isolate risky systems.
  • Update software, confirm fix, and monitor.

Frequently asked questions

What is Accellion FTA and its purpose in secure data exchange?

Accellion FTA (File Transfer Appliance) is a software solution designed for secure file transfers, enabling organizations to exchange sensitive business data with a focus on security and compliance.

What type of weakness does CVE-2021-27102 represent, and how is it classified?

CVE-2021-27102 is an OS command execution vulnerability, categorized as CWE-78, allowing an attacker to run arbitrary commands on the affected system.

How could an attacker exploit CVE-2021-27102, and what is the scope of the impact?

Exploitation requires local access to the system, where an attacker can trigger the vulnerability through a specific web service call. This could lead to unauthorized command execution with significant impact.

What is the relevance of CVE-2021-27102 according to the Halo Surface Signal?

Halo Surface Signal indicates that this vulnerability is 'Very unlikely' to be exposed to the public internet due to its requirement for local access and internal service interaction.

What steps should organizations take to address the Accellion FTA vulnerability?

Organizations should identify all affected Accellion FTA instances, limit access to or isolate vulnerable systems, and promptly apply vendor-provided updates to mitigate the risk.

References