CVE-2021-27445 : What You Need to Know

Mesa Labs AmegaView Versions 3.0 and prior have been found to have insecure file permissions that could be exploited to escalate privileges on the device. This CVE was reported by Stephen Yackey of Securifera to CISA and was made public on May 27, 2021.

Understanding CVE-2021-27445

This section will delve into the details of the CVE-2021-27445 vulnerability and its impact, along with technical details, affected systems, and mitigation steps.

What is CVE-2021-27445?

CVE-2021-27445 refers to the improper privilege management vulnerability identified in Mesa Labs' AmegaView software versions 3.0 and earlier. Attackers could potentially exploit this vulnerability to escalate privileges on the impacted device.

The Impact of CVE-2021-27445

The CVSS score for CVE-2021-27445 is 7.8, indicating a high severity level. The vulnerability's impact includes high confidentiality, integrity, and availability impact, with low privileges required for exploitation and a low attack complexity.

Technical Details of CVE-2021-27445

Let's dig deeper into the technical aspects of the CVE-2021-27445 vulnerability.

Vulnerability Description

The vulnerability arises from insecure file permissions in Mesa Labs' AmegaView software versions 3.0 and earlier, allowing threat actors to elevate their privileges on the affected device.

Affected Systems and Versions

The affected product is AmegaView by Mesa Labs, with versions equal to or less than 3.0 being impacted. These versions are categorized as custom by the vendor.

Exploitation Mechanism

With a CVSS vector string of 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H', the vulnerability has a local attack vector and low attack complexity, requiring low privileges to be exploited.

Mitigation and Prevention

To address CVE-2021-27445 and safeguard systems from potential exploitation, follow these mitigation steps.

Immediate Steps to Take

Mesa Labs has scheduled AmegaView for end-of-life by the end of 2021. Since no updates will be released to address these vulnerabilities, users are advised to upgrade to the newer ViewPoint software compatible with AmegaView hardware.

Long-Term Security Practices

To minimize the risk of exploitation, users should minimize network exposure for all control system devices, ensure they are not accessible from the internet, and isolate them behind firewalls. Secure remote access using VPNs is recommended, with regular updates to ensure security.

Patching and Updates

Due to Mesa Labs discontinuing support for AmegaView, users must transition to the ViewPoint software and regularly update their systems to enhance security measures.