9.8
CRITICAL
CVE-2021-28809
QNAP HBS 3 Operating System Improper Access Control Vulnerability
Description

An improper access control vulnerability has been reported to affect certain legacy versions of HBS 3. If exploited, this vulnerability allows attackers to compromise the security of the operating system.QNAP have already fixed this vulnerability in the following versions of HBS 3: QTS 4.3.6: HBS 3 v3.0.210507 and later QTS 4.3.4: HBS 3 v3.0.210506 and later QTS 4.3.3: HBS 3 v3.0.210506 and later

INFO

Published Date :

July 8, 2021, 8:15 a.m.

Last Modified :

Nov. 21, 2024, 6 a.m.

Source :

[email protected]

Remotely Exploitable :

Yes !

Impact Score :

5.9

Exploitability Score :

3.9
Affected Products

The following products are affected by CVE-2021-28809 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Qnap qts
2 Qnap hybrid_backup_sync
: Total Affected Vendor : 1 | Products : 2
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2021-28809.

URL Resource
https://www.qnap.com/en/security-advisory/qsa-21-19 Vendor Advisory
https://www.zerodayinitiative.com/advisories/ZDI-21-783/ Third Party Advisory VDB Entry
https://www.qnap.com/en/security-advisory/qsa-21-19 Vendor Advisory
https://www.zerodayinitiative.com/advisories/ZDI-21-783/ Third Party Advisory VDB Entry

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2021-28809 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2021-28809 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by af854a3a-2127-422b-91ae-364da2661108

    Nov. 21, 2024

    Action Type Old Value New Value
    Added Reference https://www.qnap.com/en/security-advisory/qsa-21-19
    Added Reference https://www.zerodayinitiative.com/advisories/ZDI-21-783/
  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • Initial Analysis by [email protected]

    Jul. 12, 2021

    Action Type Old Value New Value
    Added CVSS V2 NIST (AV:N/AC:L/Au:N/C:C/I:C/A:C)
    Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    Changed Reference Type https://www.qnap.com/en/security-advisory/qsa-21-19 No Types Assigned https://www.qnap.com/en/security-advisory/qsa-21-19 Vendor Advisory
    Changed Reference Type https://www.zerodayinitiative.com/advisories/ZDI-21-783/ No Types Assigned https://www.zerodayinitiative.com/advisories/ZDI-21-783/ Third Party Advisory, VDB Entry
    Added CPE Configuration AND OR *cpe:2.3:a:qnap:hybrid_backup_sync:*:*:*:*:*:*:*:* versions up to (excluding) 3.0.210507 OR cpe:2.3:o:qnap:qts:4.3.6:-:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:a:qnap:hybrid_backup_sync:*:*:*:*:*:*:*:* versions up to (excluding) 3.0.210506 OR cpe:2.3:o:qnap:qts:4.3.4:-:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:a:qnap:hybrid_backup_sync:*:*:*:*:*:*:*:* versions up to (excluding) 3.0.210506 OR cpe:2.3:o:qnap:qts:4.3.3:-:*:*:*:*:*:*
  • CVE Modified by [email protected]

    Jul. 08, 2021

    Action Type Old Value New Value
    Added Reference https://www.zerodayinitiative.com/advisories/ZDI-21-783/ [No Types Assigned]
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2021-28809 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2021-28809 weaknesses.

CAPEC-19: Embedding Scripts within Scripts Embedding Scripts within Scripts CAPEC-441: Malicious Logic Insertion Malicious Logic Insertion CAPEC-478: Modification of Windows Service Configuration Modification of Windows Service Configuration CAPEC-479: Malicious Root Certificate Malicious Root Certificate CAPEC-502: Intent Spoof Intent Spoof CAPEC-503: WebView Exposure WebView Exposure CAPEC-536: Data Injected During Configuration Data Injected During Configuration CAPEC-546: Incomplete Data Deletion in a Multi-Tenant Environment Incomplete Data Deletion in a Multi-Tenant Environment CAPEC-550: Install New Service Install New Service CAPEC-551: Modify Existing Service Modify Existing Service CAPEC-552: Install Rootkit Install Rootkit CAPEC-556: Replace File Extension Handlers Replace File Extension Handlers CAPEC-558: Replace Trusted Executable Replace Trusted Executable CAPEC-562: Modify Shared File Modify Shared File CAPEC-563: Add Malicious File to Shared Webroot Add Malicious File to Shared Webroot CAPEC-564: Run Software at Logon Run Software at Logon CAPEC-578: Disable Security Software Disable Security Software CAPEC-12: Choosing Message Identifier Choosing Message Identifier CAPEC-36: Using Unpublished Interfaces or Functionality Using Unpublished Interfaces or Functionality CAPEC-62: Cross Site Request Forgery Cross Site Request Forgery CAPEC-166: Force the System to Reset Values Force the System to Reset Values CAPEC-216: Communication Channel Manipulation Communication Channel Manipulation CAPEC-500: WebView Injection WebView Injection
Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

0.56 }} -0.01%

score

0.77591

percentile

CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
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