CVE-2021-43523

Severity Score

9.6

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

In uClibc and uClibc-ng before 1.0.39, incorrect handling of special characters in domain names returned by DNS servers via gethostbyname, getaddrinfo, gethostbyaddr, and getnameinfo can lead to output of wrong hostnames (leading to domain hijacking) or injection into applications (leading to remote code execution, XSS, applications crashes, etc.). In other words, a validation step, which is expected in any stub resolver, does not occur.

En uClibc y uClibc-ng versiones anteriores a 1.0.39, el manejo incorrecto de los caracteres especiales en los nombres de dominio devueltos por los servidores DNS por medio de gethostbyname, getaddrinfo, gethostbyaddr y getnameinfo puede conllevar a una salida de nombres de host erróneos (conllevando al secuestro de dominios) o una inyección en aplicaciones (conllevando a una ejecución de código remota, un ataque de tipo XSS, bloqueo de aplicaciones, etc.). En otras palabras, un paso de comprobación, que se espera en cualquier stub resolver, no ocurre

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Network

Attack Complexity

Medium

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-11-08 CVE Reserved
2021-11-10 CVE Published
2024-08-04 CVE Updated
2024-08-04 First Exploit
2024-12-17 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CAPEC

References (3)

URL	Tag	Source

URL	Date	SRC
https://www.openwall.com/lists/oss-security/2021/11/09/1	2024-08-04

URL	Date	SRC
https://github.com/wbx-github/uclibc-ng/commit/0f822af0445e5348ce7b7bd8ce1204244f31d174	2021-11-15

URL	Date	SRC
https://uclibc-ng.org	2021-11-15

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Uclibc Search vendor "Uclibc"		Uclibc Search vendor "Uclibc" for product "Uclibc"				<= 0.9.33.2 Search vendor "Uclibc" for product "Uclibc" and version " <= 0.9.33.2"		-		Affected
Uclibc-ng Project Search vendor "Uclibc-ng Project"		Uclibc-ng Search vendor "Uclibc-ng Project" for product "Uclibc-ng"				< 1.0.39 Search vendor "Uclibc-ng Project" for product "Uclibc-ng" and version " < 1.0.39"		-		Affected