QTS: Improper Neutralization of Special Elements used in an OS Command
CVE-2023-39300 is a high-severity improper neutralization of special elements used in an OS command vulnerability in QTS from QNAP, with a CVSS 3.1 base score of 7.2 out of 10. It can be exploited remotely over the network by an attacker with administrator privileges, without any action from a user. The record lists versions 4.3.6.2805 build 20240619, 4.3.4.2814 build 20240618, 4.3.3.2784 build 20240619 as the first without the flaw, so updating QTS to one of those releases or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 1.21% chance of exploitation within 30 days, higher than 69% of scored CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update QTS to 4.3.6.2805 build 20240619 or 4.3.4.2814 build 20240618 or 4.3.3.2784 build 20240619 or 4.2.6 build 20240618, whichever matches your release line, or a later version.
- Read the advisory on qnap.com for workarounds and exact fixed builds.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| QNAP | QTS | 4.3.6 up to, but not including, 4.3.6.2805 build 20240619; 4.3.4 up to, but not including, 4.3.4.2814 build 20240618; 4.3.3 up to, but not including, 4.3.3.2784 build 20240619; 4.2.6 up to, but not including, 4.2.6 build 20240618; 4.3.6 up to, but not including, 4.3.6.2805_build_20240619; 4.3.4 up to, but not including, 4.3.4.2814_build_20240618; 4.3.3 up to, but not including, 4.3.3.2784_build_20240619; 4.2.6 up to, but not including, 4.2.6_build_20240618 | 4.3.6.2805 build 20240619, 4.3.4.2814 build 20240618, 4.3.3.2784 build 20240619, 4.2.6 build 20240618, 4.3.6.2805_build_20240619, 4.3.4.2814_build_20240618 |
| QNAP | QuTS hero | Not specified in the record | Not stated |
| QNAP | QuTScloud | Not specified in the record | Not stated |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- HighAdministrator-level access is required first.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- HighData or code can be modified at will.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 7.2 | High | CNA (qnapsecurity.com.tw) |
| CVSS 3.1 | 7.2 | High | NVD |
Official description
An OS command injection vulnerability has been reported to affect legacy QTS. If exploited, the vulnerability could allow authenticated administrators to execute commands via a network. We have already fixed the vulnerability in the following versions: QTS 4.3.6.2805 build 20240619 and later QTS 4.3.4.2814 build 20240618 and later QTS 4.3.3.2784 build 20240619 and later QTS 4.2.6 build 20240618 and later
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Improper Neutralization of Special Elements used in an OS Command
The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command before it is sent to a downstream component.
How developers prevent this class of flaw
- If at all possible, use library calls rather than external processes to recreate the desired functionality.
- For any data that will be used to generate a command to be executed, keep as much of that data out of external control as possible. For example, in web applications, this may require storing the data locally in the session's state instead of sending it out to the client in a hidden form field.
- For any security checks that are performed on the client side, ensure that these checks are duplicated on the server side, in order to avoid CWE-602. Attackers can bypass the client-side checks by modifying values after the checks have been performed, or by changing the client to remove the client-side checks entirely. Then, these modified values would be submitted to the server.
More Improper Neutralization of Special Elements used in an OS Command vulnerabilities (CWE-78)
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: total).
- Record last changed materially (score, affected products, status or references).
References
Advisories
Other vulnerabilities in QTS
- 7.2 High severity
- 7.2 High severity
- 7.2 High severity
- 7.2 High severity
- 7.2 High severity
- 7.2 High severity
Recent Improper Neutralization of Special Elements used in an OS Command vulnerabilities
- 8.8 High severity
- 8.8 High severity
- 8.8 High severity
- 7.2 High severity
- 8.8 High severity
- 7.2 High severity
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