CVE-2020-27539 — CRITICAL (9.8)

Vulnerability Description

Heap overflow with full parsing of HTTP respose in Rostelecom CS-C2SHW 5.0.082.1. AgentUpdater service has a self-written HTTP parser and builder. HTTP parser has a heap buffer overflow (OOB write). In default configuration camera parses responses only from HTTPS URLs from config file, so vulnerable code is unreachable and one more bug required to reach it.

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-787

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-2020-27539?

CVE-2020-27539 is a vulnerability with a CVSS score of 9.8 (CRITICAL). Heap overflow with full parsing of HTTP respose in Rostelecom CS-C2SHW 5.0.082.1. AgentUpdater service has a self-written HTTP parser and builder. HTTP parser has a heap buffer overflow (OOB write). I...

How severe is CVE-2020-27539?

CVE-2020-27539 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-2020-27539?

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