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CVE-2021-44052— Arbitrary file read

Quick assessment

Affected
QNAP Systems Inc. QuTScloud
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 QuTScloud是中国威联通科技（QNAP Systems）公司的一种 QNAP NAS 操作系统的云端优化版本。 QNAP QTS、QuTS hero 和 QuTScloud 存在后置链接漏洞，该漏洞源于链接跟踪问题。远程攻击者利用此漏洞可以遍历文件系统到非预期位置并读取或覆盖文件。以下产品和版本受到影响：QNAP QTS: 5.0.0.1986 20220324 之前版本, 4.5.4.1991 20220329 版本, 4.3.6.1965 20220302 版

CVSS 6.5 · Medium EPSS 1.59% · P75

Possible ATT&CK Techniques 1 AI

T1557 · Adversary-in-the-Middle
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I. Basic Information for CVE-2021-44052

Vulnerability Information
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Vulnerability Title
Arbitrary file read
Source: CVE Program / CVE List V5
Vulnerability Description
An improper link resolution before file access ('Link Following') vulnerability has been reported to affect QNAP device running QuTScloud, QuTS hero, and QTS. If exploited, this vulnerability allows remote attackers to traverse the file system to unintended locations and read or overwrite the contents of unexpected files. We have already fixed this vulnerability in the following versions of QuTScloud, QuTS hero, and QTS: QuTScloud c5.0.1.1998 and later QuTS hero h4.5.4.1971 build 20220310 and later QuTS hero h5.0.0.1986 build 20220324 and later QTS 4.3.4.1976 build 20220303 and later QTS 4.3.3.1945 build 20220303 and later QTS 4.2.6 build 20220304 and later QTS 4.3.6.1965 build 20220302 and later QTS 5.0.0.1986 build 20220324 and later QTS 4.5.4.1991 build 20220329 and later
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在文件访问前对链接解析不恰当(链接跟随)
Source: CVE Program / CVE List V5
Vulnerability Title
QNAP多款产品后置链接漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
QNAP Systems QNAP QuTScloud是中国威联通科技（QNAP Systems）公司的一种 QNAP NAS 操作系统的云端优化版本。 QNAP QTS、QuTS hero 和 QuTScloud 存在后置链接漏洞，该漏洞源于链接跟踪问题。远程攻击者利用此漏洞可以遍历文件系统到非预期位置并读取或覆盖文件。以下产品和版本受到影响：QNAP QTS: 5.0.0.1986 20220324 之前版本, 4.5.4.1991 20220329 版本, 4.3.6.1965 20220302 版
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. QuTScloud unspecified ~ c5.0.1.1998 -
QNAP Systems Inc. QuTS hero unspecified ~ h4.5.4.1971 build 20220310 -
QNAP Systems Inc. QTS unspecified ~ 4.3.4.1976 build 20220303 -

II. Public POCs for CVE-2021-44052

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III. Intelligence Information for CVE-2021-44052

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Other References for CVE-2021-44052 (1)

Same Patch Batch · QNAP Systems Inc. · 2022-05-05 · 9 CVEs total

CVE-2022-27588 9.8 CRITICAL Vulnerability in QVR
CVE-2021-44051 8.8 HIGH Command injection
CVE-2021-44056 7.1 HIGH Improper authentication in Video Station
CVE-2021-44057 7.1 HIGH Improper authentication in Photo Station
CVE-2021-44053 5.7 MEDIUM Reflected XSS
CVE-2021-38693 5.3 MEDIUM Path Traversal in thttpd
CVE-2021-44055 5.3 MEDIUM Information leakage in Video Station
CVE-2021-44054 4.3 MEDIUM Open redirect

IV. Related Vulnerabilities

Same product: QuTScloud
Same vendor: QNAP Systems Inc.
Same weakness: CWE-59

V. Comments for CVE-2021-44052

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