CVE-2021-38691— Stack Overflow Vulnerability in QVR Elite, QVR Pro and QVR Guard
Quick assessment
Affected
QNAP Systems Inc. QVR Elite
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Qnap Qvr Elite是中国威联通科技（Qnap）公司的一款基于订阅的智能监控解决方案。 QNAP device 存在安全漏洞，该漏洞源于软件中存在基于堆栈的缓冲区溢出漏洞，攻击者可利用该漏洞就可以执行任意代码。
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2021-38691
Vulnerability Information
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Vulnerability Title
Stack Overflow Vulnerability in QVR Elite, QVR Pro and QVR Guard
Source: CVE Program / CVE List V5
Vulnerability Description
A stack buffer overflow vulnerability has been reported to affect QNAP device running QVR Elite, QVR Pro, QVR Guard. If exploited, this vulnerability allows attackers to execute arbitrary code. We have already fixed this vulnerability in the following versions of QVR Elite, QVR Pro, QVR Guard: QuTS hero h5.0.0: QVR Elite 2.1.4.0 (2021/12/06) and later QuTS hero h4.5.4: QVR Elite 2.1.4.0 (2021/12/06) and later QTS 5.0.0: QVR Elite 2.1.4.0 (2021/12/06) and later QTS 4.5.4: QVR Elite 2.1.4.0 (2021/12/06) and later QTS 4.5.4: QVR Pro 2.1.3.0 (2021/12/06) and later QTS 5.0.0: QVR Pro 2.1.3.0 (2021/12/06) and later QTS 4.5.4: QVR Guard 2.1.3.0 (2021/12/06) and later QTS 5.0.0: QVR Guard 2.1.3.0 (2021/12/06) and later
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未进行输入大小检查的缓冲区拷贝(传统缓冲区溢出)
Source: CVE Program / CVE List V5
Vulnerability Title
Qnap Qvr Elite 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Qnap Qvr Elite是中国威联通科技（Qnap）公司的一款基于订阅的智能监控解决方案。 QNAP device 存在安全漏洞，该漏洞源于软件中存在基于堆栈的缓冲区溢出漏洞，攻击者可利用该漏洞就可以执行任意代码。
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)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| QNAP Systems Inc. | QVR Elite | unspecified ~ 2.1.4.0 (2021/12/06) | - |
|
| QNAP Systems Inc. | QVR Elite | unspecified ~ 2.1.4.0 (2021/12/06) | - |
|
| QNAP Systems Inc. | QVR Elite | unspecified ~ 2.1.4.0 (2021/12/06) | - |
|
| QNAP Systems Inc. | QVR Elite | unspecified ~ 2.1.4.0 (2021/12/06) | - |
|
| QNAP Systems Inc. | QVR Pro | unspecified ~ 2.1.3.0 (2021/12/06) | - |
|
| QNAP Systems Inc. | QVR Pro | unspecified ~ 2.1.3.0 (2021/12/06) | - |
|
| QNAP Systems Inc. | QVR Guard | unspecified ~ 2.1.3.0 (2021/12/06) | - |
|
| QNAP Systems Inc. | QVR Guard | unspecified ~ 2.1.3.0 (2021/12/06) | - |
|
II. Public POCs for CVE-2021-38691
| # | POC Description | Source Link | Shenlong Link |
|---|
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Other References for CVE-2021-38691 (1)
-
https://www.qnap.com/en/security-advisory/qsa-21-59 x_refsource_MISC
Same Patch Batch · QNAP Systems Inc. · 2022-01-14 · 7 CVEs total
| CVE-2021-38682 | 8.1 HIGH | Stack Overflow Vulnerability in QVR Elite, QVR Pro and QVR Guard |
| CVE-2021-38689 | 8.1 HIGH | Stack Overflow Vulnerability in QVR Elite, QVR Pro and QVR Guard |
| CVE-2021-38690 | 8.1 HIGH | Stack Overflow Vulnerability in QVR Elite, QVR Pro and QVR Guard |
| CVE-2021-38692 | 8.1 HIGH | Stack Overflow Vulnerability in QVR Elite, QVR Pro and QVR Guard |
| CVE-2021-38678 | 6.1 MEDIUM | Open Redirect Vulnerability in QcalAgent |
| CVE-2021-38677 | 5.3 MEDIUM | Reflected XSS Vulnerability in QcalAgent |
IV. Related Vulnerabilities
Same product: QVR Elite
-
CVE-2021-38692
Stack Overflow Vulnerability in QVR Elite, QVR Pro and QVR G -
CVE-2021-38690
Stack Overflow Vulnerability in QVR Elite, QVR Pro and QVR G -
CVE-2021-38689
Stack Overflow Vulnerability in QVR Elite, QVR Pro and QVR G -
CVE-2021-38682
Stack Overflow Vulnerability in QVR Elite, QVR Pro and QVR G
Same weakness: CWE-120
-
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V. Comments for CVE-2021-38691
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