Rg-ew1800gx Pro Firmware: Improper Neutralization of Special Elements used in a Command
CVE-2023-27796 is a high-severity improper neutralization of special elements used in a command vulnerability in Rg-ew1800gx Pro Firmware from Ruijienetworks, with a CVSS 3.1 base score of 8.8 out of 10. It can be exploited remotely over the network by an attacker with a low-privileged account, without any action from a user. Affected Rg-ew1800gx Pro Firmware versions: ew_3.0\(1\)b11p204. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 2.35% chance of exploitation within 30 days, higher than 84% of scored CVEs.
High severity with no evidence of exploitation so far.
What to do
- Check which version of Rg-ew1800gx Pro Firmware you run against the affected versions below, and install the vendor's latest release.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Ruijienetworks | Rg-ew1800gx Pro Firmware | ew_3.0\(1\)b11p204 | Not stated |
| Ruijienetworks | Rg-ew3200gx Pro Firmware | ew_3.0\(1\)b11p204 | Not stated |
| Ruijienetworks | Rg-ew1200g Pro Firmware | ew_3.0\(1\)b11p204 | Not stated |
Version data comes from NVD's product matching. 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
- LowA basic user account is enough.
- 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:L/UI:N/S:U/C:H/I:H/A:H. Scored by NVD.
Official description
RG-EW1200G PRO Wireless Routers EW_3.0(1)B11P204, RG-EW1800GX PRO Wireless Routers EW_3.0(1)B11P204, and RG-EW3200GX PRO Wireless Routers EW_3.0(1)B11P204 were discovered to contain multiple command injection vulnerabilities via the data.ip, data.protocal, data.iface and data.package parameters in the runPackDiagnose function of diagnose.lua.
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 a Command
The product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when 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.
- If possible, ensure that all external commands called from the program are statically created.
- Run time: Run time policy enforcement may be used in an allowlist fashion to prevent use of any non-sanctioned commands.
More Improper Neutralization of Special Elements used in a Command vulnerabilities (CWE-77)
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
Technical write-ups (may include proof of concept)
- github.com/winmt/my-vuls/tree/main/RG-EW%20PRO%20SeriesExploit, Third Party Advisory
Recent Improper Neutralization of Special Elements used in a Command vulnerabilities
- 9.8 Critical severity
- 9.8 Critical severity
- 9.8 Critical severity
- 9.8 Critical severity
- 9.8 Critical severity
- 9.8 Critical severity
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