Finding APC assets vulnerable to TLStorm

(updated ), by Pearce Barry
icon

Researchers at Armis recently published details on three new vulnerabilities affecting cloud-connected APC Smart-UPS devices manufactured by Schneider Electric. Dubbed “TLStorm”, two of these vulnerabilities exist in the firmware TLS implementation, while the third vulnerability exists in the firmware update process.

The disclosed CVEs for TLStorm include:

  • CVE-2022-22806 (CVSS “critical” score of 9.9) - Authentication bypass via state confusion during TLS handshake
  • CVE-2022-22805 (CVSS “critical” score of 9.9) - Pre-authentication buffer overflow in TLS
  • CVE-2022-0715 (CVSS “high” score of 8.9) - Unsigned firmware deployment via the network or USB

What is the impact of TLStorm?

Successful exploitation of these vulnerabilities can provide unauthenticated remote code execution to a remote attacker on vulnerable APC devices that are using the SmartConnect feature (which connects them to the cloud). This opens the door to attacks that could damage the UPS device itself, attacks that could damage devices connected to the UPS, and the attacker establishing a foothold on the private corporate network..

Is an update available?

Armis coordinated with Schneider Electric on the publishing of TLStorm, and Schneider Electric encourages owners of affected APC Smart-UPS devices to update with available patched firmware. Armis offers additional mitigation techniques for improved safety (see “How can you secure your UPS devices?”).

How do I find potentially vulnerable APC assets with runZero?

From the Asset Inventory, use the following pre-built query to locate APC assets within your network that are potentially vulnerable to TLStorm:

hw:apc AND protocol:tls
Find APC assets

As always, any prebuilt queries we create are available from our Queries Library. Check out the library for other useful inventory queries.

Find APC Smart-UPS devices on your network

runZero deploys and bulds your asset inventory in minutes. Get results immediately.

Start a free trial
Rumble Screenshot

Similar Content

February 15, 2023

Finding OpenSSH servers

The OpenSSH team surfaced a security issue earlier this month that specifically affects OpenSSH server version 9.1p1 (a.k.a. version 9.1). This version contains a memory double-free vulnerability (tracked as CVE-2023-25136) that can be reached pre-authentication by a remote …

Read More

February 8, 2023

Finding VMware ESXi assets

This Rapid Response post covers ESXiArgs, a new strain of ransomware that is targeting VMware ESXi servers. Learn how you can find potentially affected servers on your network.

February 3, 2023

Finding Lexmark printer assets

Printer manufacturer Lexmark recently published details on a vulnerability that affects over 100 of their printer models. Learn how runZero can help you find potentially affected assets.