Unpatched Schneider Electric PowerLogic ION/PM wise meters are open to dangerous attacks.
Critical security vulnerabilities in Schneider Electric powered wise meters could make it possible for an attacker a path to remote code execution (RCE), or to reboot the meter producing a denial-of-services (DoS) issue on the product.
Schneider Electric’s PowerLogic ION/PM clever meter products line, like other intelligent meters, is utilized by customers in their residences, but also by utility businesses that deploy these meters in order to watch and bill customers for their solutions. They’re also applied by industrial organizations, info centers and healthcare organizations.
Two vulnerabilities had been disclosed this week, current in several variations of the goods. According to Claroty, which at first uncovered the flaws, they stem from the point that the good meters communicate utilizing a proprietary ION protocol in excess of TCP port 7700, and packets been given by the unit are parsed by a condition device purpose.
“We discovered that it is achievable to result in [a pre-authentication integer-overflow vulnerability] in the course of the packet-parsing system by the primary condition machine purpose by sending a crafted ask for,” researchers said, in a site submitting this 7 days. “This can be finished without having authentication since the request is totally parsed before it is dealt with or authentication is checked.”
The purpose that parses the incoming packet reads the variety of goods or people in the string or array and the buffer, which is a preset measurement, scientists described. They found out that they were being capable to completely regulate the sizing of the buffer with a DWORD that is read from the ask for.
A DWORD, which is short for “double phrase,” is a information kind definition is an unsigned, 32-little bit device of knowledge that is particular to Microsoft Windows. It can comprise an integer worth in the assortment by 4,294,967,295.
“We found out a bug in the purpose that is accountable for advancing the parsing buffer, we named this functionality advance_buffer,” in accordance to Claroty’s examination. “We uncovered that the progress_buffer perform normally returns legitimate, irrespective of other inner capabilities failing and returning false. For that reason, furnishing any huge packet measurement will constantly pass the advance_buffer functionality without triggering an mistake concept or exception. Thus, Claroty researchers were being able to bypass buffer checks and reach exploitation.”
Two Exploitation Paths, Two Bugs
Whilst exploring the various firmware for the good meters, researchers found that there are two various exploitation paths that come up from improper restriction of functions within a memory buffer, depending on the particular architecture. They described these as two distinctive vulnerabilities.
The bug tracked as CVE-2021-22714 premiums 9.8 out of 10 on the CVSS vulnerability-severity scale.
“This vulnerability [is a] critical integer-overflow vulnerability that could help an attacker to mail a specially crafted TCP packet to the product to possibly trigger it to reboot the meter or remotely operate code of their selection, depending on the architecture of the qualified product,” in accordance to the advisory.
Schneider Electric powered claimed the impacted solutions consist of:
- ION7400 (prior to V3..)
- ION9000 (prior to V3..)
- PM8000 (prior to V3..)
The bug tracked as CVE-2021-22713 exists in a number of variations of the PowerLogic ION line of meters, but was assessed a CVSS rating of 7.5 for the reason that thriving exploitation of the variations does not help distant code execution, and permits only an attacker to pressure the meter to reboot.
The list of afflicted products incorporates:
- ION8650 (prior to V4.40.1)
- ION8800 (prior to V372)
- ION7650 Hardware rev. 4 or before (prior to V376)
- ION7650 Hardware rev. 5 (prior to V416)
- ION7700/73xx (all variations)
- ION83xx/84xx/8600 (all variations)
The vulnerability was tackled in updates produced in January and March, and end users are urged to move to the patched versions:
- ION8650 users should update to V4.40.1, released on Jan. 4
- ION8800 end users should really update to V372, released on March 3
- ION7650 Hardware rev. 4 or previously should update to V376, produced on March 3
- ION7650 Hardware rev. 5 ought to update to V416, launched on March 3
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