External risk intelligence

Kaseya VSA Credential Disclosure Risk

CVE advisoryKnown Exploit

CVE-2021-30116

A vulnerability in Kaseya VSA software can expose credentials, allowing attackers to gain unauthorized system access and execute further attacks. This impacts data confidentiality, integrity, and system availability, posing a significant business risk. Apply vendor fixes to mitigate this threat.

5Halo Surface Signal

Kaseya Vsa Agent

before 9.5.0.24before 9.5.7a

External exposure likelihood

Halo Surface Signal score for CVE-2021-30116

Kaseya VSA is a remote monitoring and management (RMM) platform designed to be internet-facing to manage distributed endpoints and agents. The vulnerable component is a web-based portal page accessible via standard HTTP/S URLs, which by design must be reachable for agent communication and client downloads in normal, internet-connected administrative deployments.

Horizon Alert

Summary of the vulnerability and why it matters

Kaseya VSA software contains a vulnerability that can expose sensitive credentials. This flaw allows attackers to obtain credentials that can be used to gain unauthorized access and execute further attacks against the system. The impact can affect the confidentiality and integrity of data, as well as the availability of business systems.

  • Vulnerable Kaseya VSA software
  • Credential disclosure vulnerability
  • Unauthorized system access and attacks

Attack Path

How an attacker could exploit the issue

Kaseya VSA's unauthenticated download page can expose sensitive agent credentials. An attacker can leverage these credentials to gain session information, allowing for further unauthorized actions within the system. This attack path begins with an exposed download page, proceeds to an attacker obtaining specific agent credentials, and concludes with the attacker using these to bypass authentication and execute further attacks.

  • External download page is accessible.
  • Attacker obtains agent credentials.
  • Credentials grant session access.

Live Threat

Current exploitation, exposure, and threat context

The vulnerability in Kaseya VSA allows an attacker to obtain credentials for agent software. These credentials can then be used to gain a session ID, which facilitates further authenticated attacks. Exploitation of this vulnerability could lead to unauthorized access and execution of subsequent malicious activities within the Kaseya environment. The nature of the exploit and its past use in attacks indicate a significant risk to organizations.

  • Attackers with low skill levels.
  • Unauthenticated access to the download page.
  • High business risk and urgent attention.

Priority actions

Operational Fix

Recommended remediation, mitigation, and detection steps

The organization should address the identified vulnerability in its Kaseya VSA system to mitigate potential risks. This involves confirming which systems are affected, taking steps to limit exposure, implementing the vendor-provided solution, and verifying its successful application. Continuous monitoring is also advised to detect any related malicious activity.

  • Identify all exposed Kaseya VSA assets.
  • Reduce exposure by isolating risk.
  • Apply vendor fixes and validate.
  • Monitor for related issues.

Frequently asked questions

What is Kaseya VSA?

Kaseya VSA is a remote monitoring and management platform designed for IT systems. It enables organizations to manage and maintain distributed endpoints and agents, often over the internet.

What type of weakness does CVE-2021-30116 represent?

CVE-2021-30116 is a credential disclosure vulnerability (CWE-522). This means the software improperly handles sensitive information, such as passwords, by exposing them in a way that an attacker can access.

How can an attacker exploit this Kaseya VSA vulnerability?

An attacker can exploit this by accessing Kaseya VSA's unauthenticated download page, which then exposes agent credentials. These credentials can be used to obtain a session ID, allowing for further authenticated attacks.

What is the relevance of CVE-2021-30116 regarding threat advisories?

CVE-2021-30116 is a significant vulnerability as it allows attackers to obtain credentials for agent software. These credentials can be leveraged to gain a session ID, facilitating further authenticated attacks against the Kaseya environment. The Halo Surface Signal indicates this is a very likely threat due to the internet-facing nature of Kaseya VSA and its vulnerable web portal.

What steps should be taken to address the Kaseya VSA vulnerability?

To address this vulnerability, organizations should identify all affected Kaseya VSA assets, limit exposure by isolating risks, apply vendor-provided fixes, and validate their successful implementation. Continuous monitoring for related malicious activity is also recommended.

References