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CVE-2021-34359— Stored XSS Vulnerability in Proxy Server

Quick assessment

Affected
QNAP Systems Inc. Proxy Server
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 Systems QNAP QTS是中国威联通（Qnap Systems）公司的一款类似SAN存储架构的数据存储设备。该设备支持分层存储、镜像保护等保障功能。 QNAP QTS Proxy Server 存在跨站脚本漏洞，该漏洞源于用户提供的数据没有充分处理。远程攻击者可以欺骗受害者跟踪一个特别制作的链接，并在用户的浏览器中执行任意的HTML和脚本代码，以攻击脆弱的网站。

CVSS 6.9 · Medium EPSS 0.62% · P47
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I. Basic Information for CVE-2021-34359

Vulnerability Information
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Vulnerability Title
Stored XSS Vulnerability in Proxy Server
Source: CVE Program / CVE List V5
Vulnerability Description
A cross-site scripting (XSS) vulnerability has been reported to affect QNAP device running Proxy Server. If exploited, this vulnerability allows remote attackers to inject malicious code. We have already fixed this vulnerability in the following versions of Proxy Server: QTS 4.5.x: Proxy Server 1.4.2 ( 2021/12/30 ) and later
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
QNAP QTS Proxy Server 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Qnap Systems QNAP QTS是中国威联通（Qnap Systems）公司的一款类似SAN存储架构的数据存储设备。该设备支持分层存储、镜像保护等保障功能。 QNAP QTS Proxy Server 存在跨站脚本漏洞，该漏洞源于用户提供的数据没有充分处理。远程攻击者可以欺骗受害者跟踪一个特别制作的链接，并在用户的浏览器中执行任意的HTML和脚本代码，以攻击脆弱的网站。
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. Proxy Server unspecified ~ 1.4.2 ( 2021/12/30 ) -

II. Public POCs for CVE-2021-34359

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III. Intelligence Information for CVE-2021-34359

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Other References for CVE-2021-34359 (1)

IV. Related Vulnerabilities

Same product: Proxy Server
Same vendor: QNAP Systems Inc.
Same weakness: CWE-79

V. Comments for CVE-2021-34359

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