DSL-N17U: Unrestricted Upload of File with Dangerous Type
CVE-2024-3912 is a critical-severity unrestricted upload of file with dangerous type vulnerability in DSL-N17U from ASUS, with a CVSS 3.1 base score of 9.8 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. The record lists version 1.1.2.3_792 as the first without the flaw, so updating DSL-N17U to that release or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 1.02% chance of exploitation within 30 days, higher than 64% of scored CVEs.
Critical severity: a successful attack would have severe impact.
What to do
- Update DSL-N17U to 1.1.2.3_792 or a later version.
- Update DSL-N55U_C1 to 1.1.2.3_792 or a later version.
- Update DSL-N55U_D1 to 1.1.2.3_792 or a later version.
- Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| ASUS | DSL-N17U | earlier up to, but not including, 1.1.2.3_792 | 1.1.2.3_792 |
| ASUS | DSL-N55U_C1 | earlier up to, but not including, 1.1.2.3_792 | 1.1.2.3_792 |
| ASUS | DSL-N55U_D1 | earlier up to, but not including, 1.1.2.3_792 | 1.1.2.3_792 |
| ASUS | DSL-N66U | earlier up to, but not including, 1.1.2.3_792 | 1.1.2.3_792 |
| ASUS | DSL-N12U_C1 | earlier up to, but not including, 1.1.2.3_807 | 1.1.2.3_807 |
| ASUS | DSL-N12U_D1 | earlier up to, but not including, 1.1.2.3_807 | 1.1.2.3_807 |
| ASUS | DSL-N14U | earlier up to, but not including, 1.1.2.3_807 | 1.1.2.3_807 |
| ASUS | DSL-N14U_B1 | earlier up to, but not including, 1.1.2.3_807 | 1.1.2.3_807 |
| ASUS | DSL-N16 | earlier up to, but not including, 1.1.2.3_999 | 1.1.2.3_999 |
| ASUS | DSL-AC51 | earlier up to, but not including, 1.1.2.3_999 | 1.1.2.3_999 |
| ASUS | DSL-AC750 | earlier up to, but not including, 1.1.2.3_999 | 1.1.2.3_999 |
| ASUS | DSL-AC52U | earlier up to, but not including, 1.1.2.3_999 | 1.1.2.3_999 |
| ASUS | DSL-AC55U | earlier up to, but not including, 1.1.2.3_999 | 1.1.2.3_999 |
| ASUS | DSL-AC56U | earlier up to, but not including, 1.1.2.3_999 | 1.1.2.3_999 |
| ASUS | DSL-N10_C1 | All | Not stated |
| ASUS | DSL-N10_D1 | All | Not stated |
| ASUS | DSL-N10P_C1 | All | Not stated |
| ASUS | DSL-N12E_C1 | All | Not stated |
| ASUS | DSL-N16P | All | Not stated |
| ASUS | DSL-N16U | All | Not stated |
| ASUS | DSL-AC52 | All | Not stated |
| ASUS | DSL-AC55 | All | Not stated |
| ASUS | dsl-n66u_firmware | before 1.1.2.3_792 | 1.1.2.3_792 |
| ASUS | dsl-n12u_c1_firmware | before 1.1.2.3_807 | 1.1.2.3_807 |
| ASUS | dsl-ac55_firmware | before 1.1.2.3_999 | 1.1.2.3_999 |
Version data comes from the organisation that assigned the CVE; 1 further products are omitted here. 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
- NoneNo account or login is needed.
- 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:N/UI:N/S:U/C:H/I:H/A:H. Scored by CNA (cert.org.tw).
Official description
Certain models of ASUS routers have an arbitrary firmware upload vulnerability. An unauthenticated remote attacker can exploit this vulnerability to execute arbitrary system commands on the device.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Unrestricted Upload of File with Dangerous Type
The product allows the upload or transfer of dangerous file types that are automatically processed within its environment.
How developers prevent this class of flaw
- Generate a new, unique filename for an uploaded file instead of using the user-supplied filename, so that no external input is used at all.
- When the set of acceptable objects, such as filenames or URLs, is limited or known, create a mapping from a set of fixed input values (such as numeric IDs) to the actual filenames or URLs, and reject all other inputs.
- Consider storing the uploaded files outside of the web document root entirely. Then, use other mechanisms to deliver the files dynamically.
More Unrestricted Upload of File with Dangerous Type vulnerabilities (CWE-434)
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
Recent Unrestricted Upload of File with Dangerous Type vulnerabilities
- 7.2 High severity
- 9.8 Critical severity
- 7.2 High severity
- 9.8 Critical severity
- 8.8 High severity
- 9.8 Critical severity
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