CVE-2017-17027

QNAP QTS NASFTPD USER Stack-based Buffer Overflow Remote Code Execution Vulnerability

Severity Score

9.8

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

A buffer overflow vulnerability in FTP service in QNAP QTS version 4.2.6 build 20171026, 4.3.3.0378 build 20171117, 4.3.4.0387 (Beta 2) build 20171116 and earlier could allow remote attackers to execute arbitrary code on NAS devices.

Una vulnerabilidad de desbordamiento de búfer en el servicio FTP de QNAP QTS, en sus versiones 4.2.6 build 20171026, 4.3.3.0378 build 20171117, 4.3.4.0387 (Beta 2) build 20171116 y anteriores podría permitir que atacantes remotos ejecuten código arbitrario en dispositivos NAS.

This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of QNAP QTS NASFTPD. Authentication is not required to exploit this vulnerability.
The specific flaw exists within the NASFTPD service, which listens on TCP port 21 by default. When parsing the USER command, the process does not properly validate the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code under the context of root.

*Credits: Peter Andersson (@nervoir)

CVSS Scores

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

Partial

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

Complete

Integrity

Complete

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2017-11-28 CVE Reserved
2017-12-20 CVE Published
2024-07-18 EPSS Updated
2024-09-16 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer

CAPEC

References (2)

URL	Tag	Source
http://www.securitytracker.com/id/1040018	Third Party Advisory

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://www.qnap.com/zh-tw/security-advisory/nas-201712-15	2018-01-04

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"				<= 4.3.3.0378 Search vendor "Qnap" for product "Qts" and version " <= 4.3.3.0378"		-		Affected
Qnap Search vendor "Qnap"		Qts Search vendor "Qnap" for product "Qts"				4.3.4.0358 Search vendor "Qnap" for product "Qts" and version "4.3.4.0358"		beta1		Affected
Qnap Search vendor "Qnap"		Qts Search vendor "Qnap" for product "Qts"				4.3.4.0370 Search vendor "Qnap" for product "Qts" and version "4.3.4.0370"		beta1		Affected
Qnap Search vendor "Qnap"		Qts Search vendor "Qnap" for product "Qts"				4.3.4.0372 Search vendor "Qnap" for product "Qts" and version "4.3.4.0372"		beta1		Affected
Qnap Search vendor "Qnap"		Qts Search vendor "Qnap" for product "Qts"				4.3.4.0374 Search vendor "Qnap" for product "Qts" and version "4.3.4.0374"		beta1		Affected
Qnap Search vendor "Qnap"		Qts Search vendor "Qnap" for product "Qts"				4.3.4.0387 Search vendor "Qnap" for product "Qts" and version "4.3.4.0387"		beta2		Affected