CVE-2020-27540 — CRITICAL (9.8)

Vulnerability Description

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 Score

9.8

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

HIGH

Affected Products

Vendor	Product	Versions
Company	Cs-C2Shw Firmware	5.0.082.1
Company	Cs-C2Shw	-

Related Weaknesses (CWE)

CWE-347

References

https://dil4rd.medium.com/groundhog-day-in-iot-valley-or-5-cves-in-1-camera-7dc1ExploitThird Party Advisory
https://dil4rd.medium.com/groundhog-day-in-iot-valley-or-5-cves-in-1-camera-7dc1ExploitThird Party Advisory

FAQ

What is CVE-2020-27540?

CVE-2020-27540 is a vulnerability with a CVSS score of 9.8 (CRITICAL). 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 ...

How severe is CVE-2020-27540?

CVE-2020-27540 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.

Is there a patch for CVE-2020-27540?

Check the references section above for vendor advisories and patch information. Affected products include: Company Cs-C2Shw Firmware, Company Cs-C2Shw.