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CVE-2021-38689— 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是中国威联通科技（Qnap）公司的一个Qnap监控系统控制中心。 QVR 多款产品存在缓冲区错误漏洞，该漏洞源于一个堆栈缓冲区溢出漏洞会影响运行 QVR Elite、QVR Pro、QVR Guard 的 QNAP 设备。 如果被利用，此漏洞允许攻击者执行任意代码。

CVSS 8.1 · High EPSS 1.30% · P68

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution
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I. Basic Information for CVE-2021-38689

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缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Qnap Qvr是中国威联通科技（Qnap）公司的一个Qnap监控系统控制中心。 QVR 多款产品存在缓冲区错误漏洞，该漏洞源于一个堆栈缓冲区溢出漏洞会影响运行 QVR Elite、QVR Pro、QVR Guard 的 QNAP 设备。 如果被利用，此漏洞允许攻击者执行任意代码。
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-2021-38689

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III. Intelligence Information for CVE-2021-38689

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Other References for CVE-2021-38689 (1)

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-2021-38690 8.1 HIGH Stack Overflow Vulnerability in QVR Elite, QVR Pro and QVR Guard
CVE-2021-38691 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
Same vendor: QNAP Systems Inc.
Same weakness: CWE-120

V. Comments for CVE-2021-38689

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