high8.8
CVE-2021-27256
This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of NETGEAR R7800 firmware version 1.0.2.76.
Impact
This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of NETGEAR R7800 firmware version 1.0.2.76. Although authentication is required to exploit this vulnerability, the existing authentication mechanism can be bypassed. The specific flaw exists within the handling of the rc_service parameter provided to apply_save.cgi. The issue results from the lack of proper validation of a user-supplied string before using it to execute a system call. An attacker can leverage this vulnerability to execute code in the context of root. Was ZDI-CAN-12355.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Netgear | Br200 Firmware | before 5.10.0.5 |
| Netgear | Br500 Firmware | before 5.10.0.5 |
| Netgear | D7800 Firmware | before 1.0.1.60 |
| Netgear | Ex6100v2 Firmware | before 1.0.1.98 |
| Netgear | Ex6150v2 Firmware | before 1.0.1.98 |
| Netgear | Ex6250 Firmware | before 1.0.0.134 |
| Netgear | Ex6400 Firmware | before 1.0.2.158 |
| Netgear | Ex6400v2 Firmware | before 1.0.0.134 |
| Netgear | Ex6410 Firmware | before 1.0.0.134 |
| Netgear | Ex6420 Firmware | before 1.0.0.134 |
| Netgear | Ex7300 Firmware | before 1.0.2.158 |
| Netgear | Ex7300v2 Firmware | before 1.0.0.134 |
Weakness classification
References
- NVD record
- CVE.org record
- https://kb.netgear.com/000062883/Security-Advisory-for-Multiple-Vulnerabilities-on-Some-Routers-Satellites-and-Extenders
- https://www.zerodayinitiative.com/advisories/ZDI-21-262/
- https://kb.netgear.com/000062883/Security-Advisory-for-Multiple-Vulnerabilities-on-Some-Routers-Satellites-and-Extenders
- https://www.zerodayinitiative.com/advisories/ZDI-21-262/