CVE-2021-28799 QNAP NAS Improper Authorization
Remote attackers can bypass authorization to log in to QNAP NAS devices running HBS 3, leading to unauthorized access.
- Exploited in the wild
- Since 31 Mar 2022
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-28799?
CVE-2021-28799 is a critical missing authorization vulnerability in QNAP Systems Inc. HBS 1.3, published on 13 May 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
An improper authorization vulnerability has been reported to affect QNAP NAS running HBS 3 (Hybrid Backup Sync. ) If exploited, the vulnerability allows remote attackers to log in to a device. This issue affects: QNAP Systems Inc. HBS 3 versions prior to v16.0.0415 on QTS 4.5.2; versions prior to v3.0.210412 on QTS 4.3.6; versions prior to v3.0.210411 on QTS 4.3.4; versions prior to v3.0.210411 on QTS 4.3.3; versions prior to v16.0.0419 on QuTS hero h4.5.1; versions prior to v16.0.0419 on QuTScloud c4.5.1~c4.5.4. This issue does not affect: QNAP Systems Inc. HBS 2 . QNAP Systems Inc. HBS 1.3 .
Weakness: CWE-285
Which versions are affected by CVE-2021-28799?
It affects 1 product.
Products include Qnap Hybrid Backup Sync.
How do I fix CVE-2021-28799?
No fix has been published for CVE-2021-28799 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 21 Apr 2022.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2021-28799 being exploited?
Yes. Attackers have exploited CVE-2021-28799 in the wild since at least 31 Mar 2022, including in ransomware campaigns.
Public exploit code: 1 Nuclei template.
Other vulnerabilities in QNAP Systems Inc. HBS 1.3
Sources
Also known as GHSA-4v9x-j7pr-8wxq.