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CVE-2021-38678— Open Redirect Vulnerability in QcalAgent

Quick assessment

Affected
QNAP Systems Inc. QcalAgent
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 QcalAgent是中国威联通科技（Qnap）公司的一个时间管理中心。用于管理个人行程，与他人共用日历，分享彼此的排程。 QNAP QcalAgent 中存在输入验证错误漏洞，该漏洞源于未对用户输入数据进行适当处理。远程攻击者可利用该漏洞可以创建指向可信网站的链接，并将受害者重定向到任意域。

CVSS 6.1 · Medium EPSS 0.57% · P45

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise
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I. Basic Information for CVE-2021-38678

Vulnerability Information
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Vulnerability Title
Open Redirect Vulnerability in QcalAgent
Source: CVE Program / CVE List V5
Vulnerability Description
An open redirect vulnerability has been reported to affect QNAP device running QcalAgent. If exploited, this vulnerability allows attackers to redirect users to an untrusted page that contains malware. We have already fixed this vulnerability in the following versions of QcalAgent: QcalAgent 1.1.7 and later
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
指向未可信站点的URL重定向(开放重定向)
Source: CVE Program / CVE List V5
Vulnerability Title
Qnap QcalAgent 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Qnap QcalAgent是中国威联通科技（Qnap）公司的一个时间管理中心。用于管理个人行程，与他人共用日历，分享彼此的排程。 QNAP QcalAgent 中存在输入验证错误漏洞，该漏洞源于未对用户输入数据进行适当处理。远程攻击者可利用该漏洞可以创建指向可信网站的链接，并将受害者重定向到任意域。
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. QcalAgent unspecified ~ 1.1.7 -

II. Public POCs for CVE-2021-38678

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III. Intelligence Information for CVE-2021-38678

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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-2021-38691 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-2021-38677 5.3 MEDIUM Reflected XSS Vulnerability in QcalAgent

IV. Related Vulnerabilities

Same product: QcalAgent
Same vendor: QNAP Systems Inc.
Same weakness: CWE-601

V. Comments for CVE-2021-38678

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