Wnr612v2 Firmware: Download of Code Without Integrity Check
CVE-2023-23110 is a high-severity download of code without integrity check vulnerability in Wnr612v2 Firmware from NETGEAR, with a CVSS 3.1 base score of 7.4 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. Affected Wnr612v2 Firmware versions: 1.0.0.3 and earlier. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.59% chance of exploitation within 30 days, which is low compared with other CVEs.
High severity with no evidence of exploitation so far.
What to do
- Check which version of Wnr612v2 Firmware you run against the affected versions below, and install the vendor's latest release.
- Read the advisory on netgear.com for workarounds and exact fixed builds.
- 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 |
|---|---|---|---|
| NETGEAR | Wnr612v2 Firmware | 1.0.0.3 and earlier | Not stated |
| NETGEAR | Dgn1000v3 Firmware | 1.0.0.22 and earlier | Not stated |
| NETGEAR | D6100 Firmware | 1.0.0.63 and earlier | Not stated |
| NETGEAR | Wnr1000v2 Firmware | 1.1.2.60 and earlier | Not stated |
| NETGEAR | Xavn2001v2 Firmware | 0.4.0.7 and earlier | Not stated |
| NETGEAR | Wnr2200 Firmware | 1.0.1.102 and earlier | Not stated |
| NETGEAR | Wnr2500 Firmware | 1.0.0.34 and earlier | Not stated |
| NETGEAR | R8900 Firmware | 1.0.3.6 and earlier | Not stated |
| NETGEAR | R9000 Firmware | 1.0.3.6 and earlier | 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
- HighSuccess depends on conditions outside the attacker's control.
- 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
- NoneNo data is disclosed.
- Integrity
- HighData or code can be modified at will.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 7.4 | High | NVD |
| CVSS 3.1 | 7.4 | High | CISA (ADP) |
Official description
An exploitable firmware modification vulnerability was discovered in certain Netgear products. The data integrity of the uploaded firmware image is ensured with a fixed checksum number. Therefore, an attacker can conduct a MITM attack to modify the user-uploaded firmware image and bypass the checksum verification. This affects WNR612v2 Wireless Routers 1.0.0.3 and earlier, DGN1000v3 Modem Router 1.0.0.22 and earlier, D6100 WiFi DSL Modem Routers 1.0.0.63 and earlier, WNR1000v2 Wireless Routers 1.1.2.60 and earlier, XAVN2001v2 Wireless-N Extenders 0.4.0.7 and earlier, WNR2200 Wireless Routers 1.0.1.102 and earlier, WNR2500 Wireless Routers 1.0.0.34 and earlier, R8900 Smart WiFi Routers 1.0.3.6 and earlier, and R9000 Smart WiFi Routers 1.0.3.6 and earlier.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Download of Code Without Integrity Check
The product downloads source code or an executable from a remote location and executes the code without sufficiently verifying the origin and integrity of the code.
How developers prevent this class of flaw
- Perform proper forward and reverse DNS lookups to detect DNS spoofing.
- Encrypt the code with a reliable encryption scheme before transmitting.
- Run your code using the lowest privileges that are required to accomplish the necessary tasks. If possible, create isolated accounts with limited privileges that are only used for a single task. That way, a successful attack will not immediately give the attacker access to the rest of the software or its environment. For example, database applications rarely need to run as the database administrator, especially in day-to-day operations.
More Download of Code Without Integrity Check vulnerabilities (CWE-494)
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: poc, automatable: no, technical impact: total).
- Record last changed materially (score, affected products, status or references).
References
Advisories
Technical write-ups (may include proof of concept)
- hackmd.io/%40slASVrz_SrW7NQCsunofeA/BkBPIeGcoExploit, Third Party Advisory
- hackmd.io/%40slASVrz_SrW7NQCsunofeA/H1lIcXbcoExploit, Third Party Advisory
- hackmd.io/%40slASVrz_SrW7NQCsunofeA/HyZRxmb9sExploit, Third Party Advisory
- hackmd.io/%40slASVrz_SrW7NQCsunofeA/S1BNhbWqiExploit, Third Party Advisory
- hackmd.io/%40slASVrz_SrW7NQCsunofeA/S1qWglM5oExploit, Third Party Advisory
- hackmd.io/%40slASVrz_SrW7NQCsunofeA/S1t47EbqjExploit, Third Party Advisory
- hackmd.io/%40slASVrz_SrW7NQCsunofeA/SJCGkb-9oExploit, Third Party Advisory
- hackmd.io/%40slASVrz_SrW7NQCsunofeA/r1Z4BX-5iExploit, Third Party Advisory
- hackmd.io/%40slASVrz_SrW7NQCsunofeA/ryjVZz-5sExploit, Third Party Advisory
Recent Download of Code Without Integrity Check vulnerabilities
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