nichestack-http-server-dos-xray-194049.md

description	title	date_published	last_updated	xray_id	vul_id	cvss	severity	discovered_by	type
CVE-2021-31227 High severity. A heap buffer overflow exists in NicheStack in the code that parses the HTTP POST request due to an incorrect signed integer comparison	NicheStack HTTP server DoS	2021-08-04	2021-08-04	XRAY-194049	CVE-2021-31227	7.5	high	Denys Vozniuk	vulnerability

Summary

A heap buffer overflow exists in NicheStack in the code that parses the HTTP POST request due to an incorrect signed integer comparison

Component

InterNiche TCP/IP stack

Affected versions

InterNiche (, 4.3), fixed in 4.3

Description

An issue was discovered in HCC embedded InterNiche 4.0.1. A potential heap buffer overflow exists in the code that parses the HTTP POST request, due to an incorrect signed integer comparison. This vulnerability requires the attacker to send a malformed HTTP packet with a negative Content-Length, which bypasses the size checks and results in a large heap overflow in the wbs_multidata buffer copy.

PoC

No PoC is supplied for this issue

Vulnerability mitigations

If not needed, disable the NicheStack HTTP server through the NicheStack CLI

References

(JFrog) INFRA:HALT New Vulnerabilities Impacting OT and Critical Infrastructure

NVD