Overview
On May 31, 2021, a 3rd party researcher accused a non-US SKU DSL-2750U with firwmare vME1.16 of a security vulnerability that allows a user access to device's configuration without credentials on the local network.
Once the device was fully booted , it gave access to connected clients over LAN to upload or dowload the cfg file over tftp. This access can elevate security issues by allowing a malicious users to change the devices configuration.
The new firmware patch doesn't allow downloading or uploading config files by disabling the functionality to change or download the 2 files in the old firmware:* cfg.xml , *.img ).
3rd Party Report information
- The report provided by
MOHAMMED HADI
mohammed.hadi _at_ ump _dot_ ac _dot_ ma
- Reference :
- Public Disclosure::
- Link to Github Post
- JPCERT/CC :: CVE-2021-3707 :: Unauthorized configuration modification and CVE-2021-3708 :: Link
: CVE-2021-3708 :: :OS command injection : Link
Affected Models
| Model |
Region |
Hardware Revision |
Affected FW |
Fixed FW |
Recommendation |
Last Updated |
| DSL-2750U |
WorldWide |
All Revisions with Open firmware |
vME1.16 and below |
vME_1.22 |
Download and Upgrade |
07/26/21 |
Regarding Security patch for your D-Link Devices
Firmware updates address the security vulnerabilities in affected D-Link devices. D-Link will update this continually, and we strongly recommend all users to install the relevant updates.
Please note that this is a device beta software, beta firmware, or hot-fix release, which is still undergoing final testing before its official release. The beta software, beta firmware, or hot-fix is provided on an “as is” and “as available” basis, and the user assumes all risk and liability for use thereof. D-Link does not offer any warranties, whether express or implied, as to the suitability or usability of the beta firmware. D-Link will not be liable for any loss, whether such loss is direct, indirect, special or consequential, suffered by any party as a result of their use of the beta firmware.
As there are different hardware revisions on our products, please check this on your device before downloading the correct corresponding firmware update. The hardware revision information can usually be found on the product label on the underside of the product next to the serial number. Alternatively, they can also be found on the device web configuration.