Overview
On March 25, 2022, Realtek Semiconductor publicly disclosed (CVE-2022-27255) the Realtek eCos RSDK 1.5.7p1 and MSDK 4.9.4p1 for the RTL819x Chipset Family, has a SIP ALG function that rewrites SDP data that can be used as an attack-vector for stack-based buffer overflow. This allows an attacker to unauthenticed remotely execute code via a crafted SIP packet that contains malicious SDP data.
As soon as D-Link was made aware of the reported security issues, we had promptly started our investigation and began developing security patches.
Affected Versions:
- rtl819x-eCos-v0.x Series
- rtl819x-eCos-v1.x Series
Access Vector:
- High Security Risk by crafting anoverly long arguments in a specific SIP packet.
D-Link takes the issues of network security and user privacy very seriously. We have a dedicated task force and product management team on call to address evolving security issues and implement appropriate security measures.
Report information
- CVE-2022-27255 : Stack-Based Buffer Overflow Vulnerability in Realtek
- https://forum.defcon.org/node/241835
- https://www.realtek.com/images/safe-report/Realtek_APRouter_SDK_Advisory-CVE-2022-27255.pdf
- https://www.securityweek.com/realtek-sdk-vulnerability-exposes-routers-many-vendors-remote-attacks
Affected Models
| Model |
Hardware Revision |
Region |
Affected FW |
Fixed FW |
Recommendation |
Last Updated |
| DIR-612 |
All B1 Hardware Revisions |
Non-US |
For Chunghwa Telecom |
v2.20CHB01_Beta_Hotfix
|
Upgrade to Hofix Patch
|
09//08/2022 |
| DIR-612 |
All B1 Hardware Revisions |
Taiwan |
For Retail/Ecommerce |
v2.17TCB01_Beta_Hotfix |
Upgrade to Hofix Patch |
09//08/2022 |
| DIR-615 |
All T3 Hardware Revisions |
Taiwan |
For Retail/Ecommerce |
v20.25TCb01_Beta_Hotfix |
Upgrade to Hofix Patch |
09//08/2022 |
| DIR-615 |
All T3 Hardware Revisions |
Non-US |
For World-Wide Retail |
v20.27b01_Beta_Hotfix |
Upgrade to Hofix Patch |
09//08/2022 |
| DIR-822 |
All B1 Hardware Revisions |
Non-US |
For World-Wide Retail |
End of Life / End of Service |
Please Retire & Replace |
09//08/2022 |
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 provide 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.