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CVE-2021-28799— Improper Authorization Vulnerability in HBS 3 (Hybrid Backup Sync)

Quick assessment

Affected
QNAP Systems Inc. HBS 3
Exploitation
Confirmed exploitation in the wild; remediate immediately
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

QNAP Systems HBS 3是中国威联通科技（QNAP Systems）公司的一个应用系统。一种全面的数据备份和灾难恢复解决方案。 QNAP Systems HBS 3 Hybrid Backup Sync 存在安全漏洞，该漏洞源于没有充分的授权检查。攻击者可利用该漏洞可以绕过授权检查，直接登录设备。

CVSS 10.0 · Critical KEV · Ransomware EPSS 78.25% · P100

Public Exploits 1

Nuclei · 1 CVE-2021-28799.yaml [template]

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts
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I. Basic Information for CVE-2021-28799

Vulnerability Information
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Vulnerability Title
Improper Authorization Vulnerability in HBS 3 (Hybrid Backup Sync)
Source: CVE Program / CVE List V5
Vulnerability 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 .
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
QNAP Systems HBS 3 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
QNAP Systems HBS 3是中国威联通科技（QNAP Systems）公司的一个应用系统。一种全面的数据备份和灾难恢复解决方案。 QNAP Systems HBS 3 Hybrid Backup Sync 存在安全漏洞，该漏洞源于没有充分的授权检查。攻击者可利用该漏洞可以绕过授权检查，直接登录设备。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
QNAP Systems Inc. HBS 3 unspecified ~ v16.0.0415 -
QNAP Systems Inc. HBS 3 unspecified ~ v3.0.210412 -
QNAP Systems Inc. HBS 3 unspecified ~ v3.0.210411 -
QNAP Systems Inc. HBS 3 unspecified ~ v3.0.210411 -
QNAP Systems Inc. HBS 3 unspecified ~ v16.0.0419 -
QNAP Systems Inc. HBS 3 unspecified ~ v16.0.0419 -
QNAP Systems Inc. HBS 2 all versions -
QNAP Systems Inc. HBS 1.3 all versions -

II. Public POCs for CVE-2021-28799

# POC Description Source Link Shenlong Link
1 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 . https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-28799.yaml POC Details
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III. Intelligence Information for CVE-2021-28799

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Other References for CVE-2021-28799 (1)

Same Patch Batch · QNAP Systems Inc. · 2021-05-13 · 3 CVEs total

CVE-2020-36197 7.1 HIGH Improper Access Control Vulnerability in Music Station
CVE-2020-36198 6.7 MEDIUM Command Injection Vulnerability in Malware Remover

IV. Related Vulnerabilities

Same product: HBS 3
Same vendor: QNAP Systems Inc.
Same weakness: CWE-285

V. Comments for CVE-2021-28799

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