Path traversal in QNAP Systems, Inc. products - CVE-2021-38693
Published: May 6, 2022
Vulnerability identifier: #VU62837
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-38693
CWE-ID: CWE-22
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform directory traversal attacks.
The vulnerability exists due to input validation error when processing directory traversal sequences in thttpd. A remote attacker can send a specially crafted HTTP request and read arbitrary files on the system.
Affected software
QuTScloud
QuTS hero
QNAP QTS
QuTS hero
QNAP QTS
How to mitigate CVE-2021-38693
Install update from vendor's website.
QuTScloud - update to c5.0.1.1949
QuTS hero - addressed in versions h4.5.4.1951 Build 20220218, h5.0.0.1949 Build 20220215
QNAP QTS - addressed in versions 4.5.4.1991 20220329, 5.0.0.1986 20220324
QuTS hero - addressed in versions h4.5.4.1951 Build 20220218, h5.0.0.1949 Build 20220215
QNAP QTS - addressed in versions 4.5.4.1991 20220329, 5.0.0.1986 20220324