CVE-2021-33195

golang: net: lookup functions may return invalid host names

Severity Score

7.3

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

Go before 1.15.13 and 1.16.x before 1.16.5 has functions for DNS lookups that do not validate replies from DNS servers, and thus a return value may contain an unsafe injection (e.g., XSS) that does not conform to the RFC1035 format.

Go versiones anteriores a 1.15.13 y versiones 1.16.x anteriores a 1.16.5 tiene funciones para las búsquedas de DNS que no validan las respuestas de los servidores DNS, y por lo tanto un valor de retorno puede contener una inyección insegura (por ejemplo, XSS) que no se ajusta al formato RFC1035

A flaw was found in Go. The LookupCNAME, LookupSRV, LookupMX, LookupNS, and LookupAddr functions in the net package and methods on the Resolver type, may return arbitrary values retrieved from DNS, allowing injection of unexpected contents. The highest threat from this vulnerability is to integrity.

*Credits: N/A

CVSS Scores

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

Low

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-05-19 CVE Reserved
2021-08-02 CVE Published
2024-08-03 CVE Updated
2024-08-03 First Exploit
2024-08-05 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-20: Improper Input Validation
CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')

CAPEC

References (6)

URL	Tag	Source
https://groups.google.com/g/golang-announce	Third Party Advisory
https://security.netapp.com/advisory/ntap-20210902-0005	Third Party Advisory

URL	Date	SRC
https://groups.google.com/g/golang-announce/c/RgCMkAEQjSI	2024-08-03

URL	Date	SRC

URL	Date	SRC
https://security.gentoo.org/glsa/202208-02	2022-09-14
https://access.redhat.com/security/cve/CVE-2021-33195	2022-11-15
https://bugzilla.redhat.com/show_bug.cgi?id=1989564	2022-11-15

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Golang Search vendor "Golang"		Go Search vendor "Golang" for product "Go"				< 1.15.13 Search vendor "Golang" for product "Go" and version " < 1.15.13"		-		Affected
Golang Search vendor "Golang"		Go Search vendor "Golang" for product "Go"				>= 1.16.0 < 1.16.5 Search vendor "Golang" for product "Go" and version " >= 1.16.0 < 1.16.5"		-		Affected
Netapp Search vendor "Netapp"		Cloud Insights Telegraf Agent Search vendor "Netapp" for product "Cloud Insights Telegraf Agent"				-		-		Affected