CVE-2021-28809 Missing Authentication for Critical Function in RTRR Server in HBS3
Attackers can exploit missing authentication in the RTRR server to compromise the operating system security on affected QNAP devices.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-28809?
CVE-2021-28809 is a critical missing authorization vulnerability in QNAP Systems Inc. HBS 3, published on 8 Jul 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
An improper access control vulnerability has been reported to affect certain legacy versions of HBS 3. If exploited, this vulnerability allows attackers to compromise the security of the operating system.QNAP have already fixed this vulnerability in the following versions of HBS 3: QTS 4.3.6: HBS 3 v3.0.210507 and later QTS 4.3.4: HBS 3 v3.0.210506 and later QTS 4.3.3: HBS 3 v3.0.210506 and later
Which versions are affected by CVE-2021-28809?
It affects 1 product.
Products include Qnap Hybrid Backup Sync.
How do I fix CVE-2021-28809?
No fix has been published for CVE-2021-28809 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2021-28809 being exploited?
There is no known exploitation of CVE-2021-28809 in the wild and no public exploit code.
Other vulnerabilities in QNAP Systems Inc. HBS 3
Sources
Also known as GHSA-fwr8-wff7-fmxw.