CVE-2021-28798: Relative Path Traversal Vulnerability in QTS and QuTS hero - Security Advisory

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• Release date: May 21, 2021
• Security ID: QSA-21-14
• Severity: High
• CVE identifier: CVE-2021-28798
• Affected products: All QNAP NAS
• Status: Resolved

Summary

A relative path traversal vulnerability has been reported to affect QNAP NAS running QTS and QuTS hero. If exploited, this vulnerability allows attackers to modify files that impact system integrity.

We have already fixed this vulnerability in the following versions:

• QTS 4.5.2.1630 Build 20210406 and later
• QTS 4.3.6.1663 Build 20210504 and later
• QTS 4.3.3.1624 Build 20210416 and later
• QuTS hero h4.5.2.1638 Build 20210414 and later

QNAP NAS running QTS 4.5.3 are not affected.

Recommendation

To secure your device, we strongly recommend regularly updating your system to the latest version to benefit from vulnerability fixes. You can check the product support status to see the latest updates available to your NAS model.

Updating QTS or QuTS hero

1. Log on to QTS or QuTS hero as administrator.
2. Go to Control Panel > System > Firmware Update.
3. Under Live Update, click Check for Update.
   QTS or QuTS hero downloads and installs the latest available update.

Tip: You can also download the update from the QNAP website. Go to Support > Download Center and then perform a manual update for your specific device.

Acknowledgements: ZUSO ART

Revision History: V1.0 (May 21, 2021) - Published