CVE-2021-44052

Arbitrary file read

Severity Score

8.1

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

An improper link resolution before file access ('Link Following') vulnerability has been reported to affect QNAP device running QuTScloud, QuTS hero, and QTS. If exploited, this vulnerability allows remote attackers to traverse the file system to unintended locations and read or overwrite the contents of unexpected files. We have already fixed this vulnerability in the following versions of QuTScloud, QuTS hero, and QTS: QuTScloud c5.0.1.1998 and later QuTS hero h4.5.4.1971 build 20220310 and later QuTS hero h5.0.0.1986 build 20220324 and later QTS 4.3.4.1976 build 20220303 and later QTS 4.3.3.1945 build 20220303 and later QTS 4.2.6 build 20220304 and later QTS 4.3.6.1965 build 20220302 and later QTS 5.0.0.1986 build 20220324 and later QTS 4.5.4.1991 build 20220329 and later

Se ha informado de una vulnerabilidad de resolución de enlaces inapropiada antes del acceso a los archivos ("Link Following") que afecta a los dispositivos QNAP que ejecutan QuTScloud, QuTS hero y QTS. Si es explotada, esta vulnerabilidad permite a atacantes remotos saltar el sistema de archivos hasta ubicaciones no deseadas y leer o sobrescribir el contenido de archivos no esperados. Ya hemos corregido esta vulnerabilidad en las siguientes versiones de QuTScloud, QuTS hero y QTS: QuTScloud c5.0.1.1998 y posteriores QuTS hero h4.5.4.1971 build 20220310 y posteriores QuTS hero h5.0.0.1986 build 20220324 y posteriores QTS 4.3.4.1976 build 20220303 y posteriores QTS 4.3.3. 1945 build 20220303 y posteriores QTS 4.2.6 build 20220304 y posteriores QTS 4.3.6.1965 build 20220302 y posteriores QTS 5.0.0.1986 build 20220324 y posteriores QTS 4.5.4.1991 build 20220329 y posteriores

*Credits: Enio Pena Navarro and Michael Messner from Siemens Energy AG

CVSS Scores

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Attack Vector

Network

Attack Complexity

Low

Authentication

Single

Confidentiality

Partial

Integrity

Partial

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-11-19 CVE Reserved
2022-05-05 CVE Published
2024-07-28 EPSS Updated
2024-09-16 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-59: Improper Link Resolution Before File Access ('Link Following')

CAPEC

References (1)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://www.qnap.com/en/security-advisory/qsa-22-16	2023-11-14

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Qnap Search vendor "Qnap"		Qts Search vendor "Qnap" for product "Qts"				>= 5.0.0.1716 < 5.0.0.1986 Search vendor "Qnap" for product "Qts" and version " >= 5.0.0.1716 < 5.0.0.1986"		-		Affected
Qnap Search vendor "Qnap"		Qts Search vendor "Qnap" for product "Qts"				>= 4.3.3.0174 < 4.3.3.1945 Search vendor "Qnap" for product "Qts" and version " >= 4.3.3.0174 < 4.3.3.1945"		-		Affected
Qnap Search vendor "Qnap"		Qts Search vendor "Qnap" for product "Qts"				>= 4.3.4.0899 < 4.3.4.1976 Search vendor "Qnap" for product "Qts" and version " >= 4.3.4.0899 < 4.3.4.1976"		-		Affected
Qnap Search vendor "Qnap"		Qts Search vendor "Qnap" for product "Qts"				>= 4.3.6.0895 < 4.3.6.1965 Search vendor "Qnap" for product "Qts" and version " >= 4.3.6.0895 < 4.3.6.1965"		-		Affected
Qnap Search vendor "Qnap"		Qts Search vendor "Qnap" for product "Qts"				>= 4.4.0.0883 < 4.5.4.1991 Search vendor "Qnap" for product "Qts" and version " >= 4.4.0.0883 < 4.5.4.1991"		-		Affected
Qnap Search vendor "Qnap"		Qts Search vendor "Qnap" for product "Qts"				4.2.6 Search vendor "Qnap" for product "Qts" and version "4.2.6"		build_20170517		Affected
Qnap Search vendor "Qnap"		Qts Search vendor "Qnap" for product "Qts"				4.2.6 Search vendor "Qnap" for product "Qts" and version "4.2.6"		build_20190322		Affected
Qnap Search vendor "Qnap"		Qts Search vendor "Qnap" for product "Qts"				4.2.6 Search vendor "Qnap" for product "Qts" and version "4.2.6"		build_20190730		Affected
Qnap Search vendor "Qnap"		Qts Search vendor "Qnap" for product "Qts"				4.2.6 Search vendor "Qnap" for product "Qts" and version "4.2.6"		build_20190921		Affected
Qnap Search vendor "Qnap"		Qts Search vendor "Qnap" for product "Qts"				4.2.6 Search vendor "Qnap" for product "Qts" and version "4.2.6"		build_20191107		Affected
Qnap Search vendor "Qnap"		Qts Search vendor "Qnap" for product "Qts"				4.2.6 Search vendor "Qnap" for product "Qts" and version "4.2.6"		build_20200109		Affected
Qnap Search vendor "Qnap"		Qts Search vendor "Qnap" for product "Qts"				4.2.6 Search vendor "Qnap" for product "Qts" and version "4.2.6"		build_20200421		Affected
Qnap Search vendor "Qnap"		Qts Search vendor "Qnap" for product "Qts"				4.2.6 Search vendor "Qnap" for product "Qts" and version "4.2.6"		build_20200611		Affected
Qnap Search vendor "Qnap"		Qts Search vendor "Qnap" for product "Qts"				4.2.6 Search vendor "Qnap" for product "Qts" and version "4.2.6"		build_20200821		Affected
Qnap Search vendor "Qnap"		Qts Search vendor "Qnap" for product "Qts"				4.2.6 Search vendor "Qnap" for product "Qts" and version "4.2.6"		build_20210327		Affected
Qnap Search vendor "Qnap"		Qts Search vendor "Qnap" for product "Qts"				4.2.6 Search vendor "Qnap" for product "Qts" and version "4.2.6"		build_20211215		Affected
Qnap Search vendor "Qnap"		Quts Hero Search vendor "Qnap" for product "Quts Hero"				< h4.5.4.1771 Search vendor "Qnap" for product "Quts Hero" and version " < h4.5.4.1771"		-		Affected
Qnap Search vendor "Qnap"		Quts Hero Search vendor "Qnap" for product "Quts Hero"				>= h5.0.0.1772 < h5.0.0.1986 Search vendor "Qnap" for product "Quts Hero" and version " >= h5.0.0.1772 < h5.0.0.1986"		-		Affected
Qnap Search vendor "Qnap"		Qutscloud Search vendor "Qnap" for product "Qutscloud"				< c5.0.1.1998 Search vendor "Qnap" for product "Qutscloud" and version " < c5.0.1.1998"		-		Affected