CVE-2020-27540

Bash injection vulnerability and bypass of signature verification in Rostelecom CS-C2SHW 5.0.082.1. The camera reads firmware update configuration from SD card file vc\version.json. fw-sign parameter and from this configuration is directly inserted into a bash command. Firmware update is run automatically if there is special file on the inserted SD card.

CVSS v3 9.8 CRITICAL
CVSS v2.0 7.5 HIGH

9.8^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

7.5^/10

CVSS v2.0 : HIGH

Vector : AV:N/AC:L/Au:N/C:P/I:P/A:P

Exploitability : 10.0 / Impact : 6.4

Access Vector NETWORK

Access Complexity LOW

Authentication NONE

Confidentiality Impact PARTIAL

Integrity Impact PARTIAL

Availability Impact PARTIAL

References

Link	Resource
https://dil4rd.medium.com/groundhog-day-in-iot-valley-or-5-cves-in-1-camera-7dc1d2864707	Exploit Third Party Advisory

Configurations

Configuration 1 (hide)

AND

cpe:2.3:o:company:cs-c2shw_firmware:5.0.082.1:*:*:*:*:*:*:*

cpe:2.3:h:company:cs-c2shw:-:*:*:*:*:*:*:*

History

02 Feb 2021, 18:53

Type	Values Removed	Values Added
CPE		cpe:2.3:o:company:cs-c2shw_firmware:5.0.082.1:::::::* cpe:2.3:h:company:cs-c2shw:-:::::::*
CWE		CWE-347
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : 7.5 v3 : 9.8
References	~~(MISC) https://dil4rd.medium.com/groundhog-day-in-iot-valley-or-5-cves-in-1-camera-7dc1d2864707 -~~	(MISC) https://dil4rd.medium.com/groundhog-day-in-iot-valley-or-5-cves-in-1-camera-7dc1d2864707 - Exploit, Third Party Advisory

26 Jan 2021, 18:15

Type	Values Removed	Values Added
New CVE

Information

Published : 2021-01-26 18:15

Updated : 2023-12-10 13:41

NVD link : CVE-2020-27540

Mitre link : CVE-2020-27540

CVE.ORG link : CVE-2020-27540

JSON object : View

Products Affected

company

cs-c2shw
cs-c2shw_firmware

CWE

CWE-347

Improper Verification of Cryptographic Signature

{"id": "CVE-2020-27540", "metrics": {"cvssMetricV2": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"version": "2.0", "baseScore": 7.5, "accessVector": "NETWORK", "vectorString": "AV:N/AC:L/Au:N/C:P/I:P/A:P", "authentication": "NONE", "integrityImpact": "PARTIAL", "accessComplexity": "LOW", "availabilityImpact": "PARTIAL", "confidentialityImpact": "PARTIAL"}, "acInsufInfo": false, "impactScore": 6.4, "baseSeverity": "HIGH", "obtainAllPrivilege": false, "exploitabilityScore": 10.0, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": false}], "cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 9.8, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 3.9}]}, "published": "2021-01-26T18:15:46.113", "references": [{"url": "https://dil4rd.medium.com/groundhog-day-in-iot-valley-or-5-cves-in-1-camera-7dc1d2864707", "tags": ["Exploit", "Third Party Advisory"], "source": "cve@mitre.org"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-347"}]}], "descriptions": [{"lang": "en", "value": "Bash injection vulnerability and bypass of signature verification in Rostelecom CS-C2SHW 5.0.082.1. The camera reads firmware update configuration from SD card file vc\\version.json. fw-sign parameter and from this configuration is directly inserted into a bash command. Firmware update is run automatically if there is special file on the inserted SD card."}, {"lang": "es", "value": "Vulnerabilidad de inyecci\u00f3n Bash y omisi\u00f3n de la verificaci\u00f3n de firmas en Rostelecom CS-C2SHW versi\u00f3n 5.0.082.1. La c\u00e1mara lee la configuraci\u00f3n de actualizaci\u00f3n del firmware del archivo de la tarjeta SD vc\\version.json. El par\u00e1metro fw-sign y desde esta configuraci\u00f3n es insertado directamente en un comando bash. La actualizaci\u00f3n del firmware se ejecuta autom\u00e1ticamente si existe un archivo especial en la tarjeta SD insertada"}], "lastModified": "2021-02-02T18:53:05.450", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:company:cs-c2shw_firmware:5.0.082.1:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "DA2108A4-A3BF-4ECE-99E7-9EE9233063EB"}], "operator": "OR"}, {"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:h:company:cs-c2shw:-:*:*:*:*:*:*:*", "vulnerable": false, "matchCriteriaId": "C1CC4768-6258-44B3-9290-AF21DDB6E728"}], "operator": "OR"}], "operator": "AND"}], "sourceIdentifier": "cve@mitre.org"}