{"uuid": "5ede33a0-fb98-4169-a657-ad952148297b", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2021-22714", "type": "seen", "source": "https://t.me/hacking_Attack/958", "content": "Black Hat Ethical Hacking\nCritical Security Hole Can Knock Smart Meters Offline\n\nhttps://www.blackhatethicalhacking.com/wp-content/uploads/2017/11/black-hat-locks-and-electronics.jpg Critical Security Hole Can Knock Smart Meters OfflinePost Views: 60 \nstyle=\"display:block\"\n data-ad-client=\"ca-pub-6620833063853657\"\n data-ad-slot=\"8337846400\"\n data-ad-format=\"auto\"\n data-full-width-responsive=\"true\"> \nReading Time: 1 Minute\nCritical security vulnerabilities in Schneider Electric smart meters could allow an attacker a path to remote code execution (RCE), or to reboot the meter causing a denial-of-service (DoS) condition on the device.\nSchneider Electric\u2019s PowerLogic ION/PM smart meter product line, like other smart meters, is used by consumers in their homes, but also by utility companies that deploy these meters in order to monitor and bill customers for their services. They\u2019re also used by industrial companies, data centers and healthcare companies.\n\nTwo vulnerabilities were disclosed this week, present in numerous versions of the products. According to Claroty, which originally found the flaws, they stem from the fact that the smart meters communicate using a proprietary ION protocol over TCP port 7700, and packets received by the device are parsed by a state machine function.\n\n\u201cWe found that it is possible to trigger [a pre-authentication integer-overflow vulnerability] during the packet-parsing process by the main state machine function by sending a crafted request,\u201d researchers said, in a blog posting this week. \u201cThis can be done without authentication because the request is fully parsed before it is handled or authentication is checked.\u201d\nSee Also: Linux Systems Under Attack By New RedXOR Malware We found that it is possible to trigger [a pre-authentication integer-overflow vulnerability] during the packet-parsing process by the main state machine function by sending a crafted request,\u201d researchers said, in a blog posting\u00a0this week. \u201cThis can be done without authentication because the request is fully parsed before it is handled or authentication is checked.\u201d\n\nThe function that parses the incoming packet reads the number of items or characters in the string or array and the buffer, which is a fixed size, researchers explained. They discovered that they were able to fully control the size of the buffer with a DWORD that is read from the request.\n\nhttps://media.threatpost.com/wp-content/uploads/sites/103/2021/03/12162345/PowerLogic-300x169.jpg \nThe Schneider Electric PM5000 series.\nA DWORD, which is short for \u201cdouble word,\u201d is a data type definition is an unsigned, 32-bit unit of data that is specific to Microsoft Windows. It can contain an integer value in the range 0 through 4,294,967,295.\n\n\u201cWe discovered a bug in the function that is responsible for advancing the parsing buffer, we named this function advance_buffer,\u201d according to Claroty\u2019s analysis. \u201cWe found that the advance_buffer function always returns true, regardless of other inner functions failing and returning false. Therefore, providing any large packet size will always pass the advance_buffer function without triggering an error message or exception. Thus, Claroty researchers were able to bypass buffer checks and reach exploitation.\u201d\nSee Also: Offensive Security Tool: Skipfish Two Exploitation Paths, Two BugsWhile researching the different firmware for the smart meters, researchers found that there are two different exploitation paths that arise from improper restriction of operations within a memory buffer, depending on the specific architecture. They reported these as two different vulnerabilities.\n\nThe bug tracked as CVE-2021-22714 rates 9.8 out of 10 on the CVSS vulnerability-severity scale.\n\n\u201cTh[...]", "creation_timestamp": "2026-09-02T01:03:26.397438Z"}