Known Exploited Vulnerability
10.0
CRITICAL
CVE-2021-28799
QNAP NAS Improper Authorization Vulnerability - [Actively Exploited]
Description

An improper authorization vulnerability has been reported to affect QNAP NAS running HBS 3 (Hybrid Backup Sync. ) If exploited, the vulnerability allows remote attackers to log in to a device. This issue affects: QNAP Systems Inc. HBS 3 versions prior to v16.0.0415 on QTS 4.5.2; versions prior to v3.0.210412 on QTS 4.3.6; versions prior to v3.0.210411 on QTS 4.3.4; versions prior to v3.0.210411 on QTS 4.3.3; versions prior to v16.0.0419 on QuTS hero h4.5.1; versions prior to v16.0.0419 on QuTScloud c4.5.1~c4.5.4. This issue does not affect: QNAP Systems Inc. HBS 2 . QNAP Systems Inc. HBS 1.3 .

INFO

Published Date :

May 13, 2021, 3:15 a.m.

Last Modified :

Nov. 14, 2023, 7:26 p.m.

Source :

[email protected]

Remotely Exploitable :

Yes !

Impact Score :

6.0

Exploitability Score :

3.9
CISA Notification
CISA KEV (Known Exploited Vulnerabilities)

For the benefit of the cybersecurity community and network defenders—and to help every organization better manage vulnerabilities and keep pace with threat activity—CISA maintains the authoritative source of vulnerabilities that have been exploited in the wild.

Description :

QNAP NAS running HBS 3 contains an improper authorization vulnerability which can allow remote attackers to log in to a device.

Required Action :

Apply updates per vendor instructions.

Public PoC/Exploit Available at Github

CVE-2021-28799 has a 3 public PoC/Exploit available at Github. Go to the Public Exploits tab to see the list.

Affected Products

The following products are affected by CVE-2021-28799 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 hybrid_backup_sync
: Total Affected Vendor : 1 | Products : 1
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-2021-28799.

URL Resource
https://www.qnap.com/en/security-advisory/QSA-21-13 Vendor Advisory

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).

Profile Photo
triw0lf/Security-Matters-22

Resources for Security Matters talk 2022

Updated: 2 years, 7 months ago
1 stars 0 fork 0 watcher
Born at : April 20, 2022, 5:31 p.m. This repo has been linked 39 different CVEs too.
Profile Photo
Ostorlab/KEV

Ostorlab KEV: One-command to detect most remotely known exploitable vulnerabilities. Sourced from CISA KEV, Google's Tsunami, Ostorlab's Asteroid and Bug Bounty programs.

cisa-kev vulnerability 0day cisa exploits

Updated: 2 months, 2 weeks ago
516 stars 32 fork 32 watcher
Born at : April 19, 2022, 8:58 a.m. This repo has been linked 1181 different CVEs too.
Profile Photo
r0eXpeR/supplier

主流供应商的一些攻击性漏洞汇总

Updated: 2 months, 2 weeks ago
805 stars 142 fork 142 watcher
Born at : Nov. 8, 2021, 2:12 a.m. This repo has been linked 93 different CVEs too.

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

The following list is the news that have been mention CVE-2021-28799 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2021-28799 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 [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • Reanalysis by [email protected]

    Jul. 14, 2022

    Action Type Old Value New Value
    Removed CWE NIST CWE-863
    Added CWE NIST NVD-CWE-Other
  • CPE Deprecation Remap by [email protected]

    Jun. 21, 2021

    Action Type Old Value New Value
    Changed CPE Configuration OR *cpe:2.3:a:qnap:quts_hero:h4.5.1:*:*:*:*:*:*:* OR *cpe:2.3:o:qnap:quts_hero:h4.5.1:*:*:*:*:*:*:*
  • Initial Analysis by [email protected]

    Jun. 01, 2021

    Action Type Old Value New Value
    Added CVSS V2 NIST (AV:N/AC:L/Au:N/C:P/I:P/A:P)
    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-21-13 No Types Assigned https://www.qnap.com/en/security-advisory/QSA-21-13 Vendor Advisory
    Added CWE NIST CWE-863
    Added CPE Configuration AND OR *cpe:2.3:a:qnap:hybrid_backup_sync:*:*:*:*:*:*:*:* versions up to (excluding) 16.0.0415 OR cpe:2.3:a:qnap:qts:4.5.2:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:a:qnap:hybrid_backup_sync:*:*:*:*:*:*:*:* versions up to (excluding) 3.0.210412 OR cpe:2.3:a:qnap:qts:4.3.6:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:a:qnap:hybrid_backup_sync:*:*:*:*:*:*:*:* versions up to (excluding) 3.0.210411 OR cpe:2.3:a:qnap:qts:4.3.3:*:*:*:*:*:*:* cpe:2.3:a:qnap:qts:4.3.4:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:a:qnap:hybrid_backup_sync:*:*:*:*:*:*:*:* versions up to (excluding) 16.0.0419 OR cpe:2.3:a:qnap:quts_hero:h4.5.1:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:a:qnap:hybrid_backup_sync:*:*:*:*:*:*:*:* versions up to (excluding) 16.0.0419 OR cpe:2.3:o:qnap:qutscloud:*:*:*:*:*:*:*:* versions from (including) c4.5.1 up to (including) c4.5.4
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-2021-28799 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-2021-28799 weaknesses.

CAPEC-1: Accessing Functionality Not Properly Constrained by ACLs Accessing Functionality Not Properly Constrained by ACLs CAPEC-5: Blue Boxing Blue Boxing CAPEC-13: Subverting Environment Variable Values Subverting Environment Variable Values CAPEC-17: Using Malicious Files Using Malicious Files CAPEC-39: Manipulating Opaque Client-based Data Tokens Manipulating Opaque Client-based Data Tokens CAPEC-45: Buffer Overflow via Symbolic Links Buffer Overflow via Symbolic Links CAPEC-51: Poison Web Service Registry Poison Web Service Registry CAPEC-59: Session Credential Falsification through Prediction Session Credential Falsification through Prediction CAPEC-60: Reusing Session IDs (aka Session Replay) Reusing Session IDs (aka Session Replay) CAPEC-76: Manipulating Web Input to File System Calls Manipulating Web Input to File System Calls CAPEC-77: Manipulating User-Controlled Variables Manipulating User-Controlled Variables CAPEC-87: Forceful Browsing Forceful Browsing CAPEC-104: Cross Zone Scripting Cross Zone Scripting CAPEC-127: Directory Indexing Directory Indexing CAPEC-402: Bypassing ATA Password Security Bypassing ATA Password Security CAPEC-647: Collect Data from Registries Collect Data from Registries CAPEC-668: Key Negotiation of Bluetooth Attack (KNOB) Key Negotiation of Bluetooth Attack (KNOB)
Exploit Prediction

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

87.99 }} -0.99%

score

0.98613

percentile

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