high
8.8
CWE
78
Advisory Published
Updated
Advisory Published

CVE-2021-27256: (Pwn2Own) NETGEAR R7800 apply_save.cgi rc_service Command Injection Remote Code Execution Vulnerability

First published: Fri Mar 05 2021(Updated: )

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.

Credit: zdi-disclosures@trendmicro.com

Affected SoftwareAffected VersionHow to fix
NETGEAR R7800<5.10.0.5
Netgear Br200
NETGEAR R7800<5.10.0.5
Netgear Br500
Netgear D7800 Firmware<1.0.1.60
Netgear D7800
Netgear Ex6100v2 Firmware<1.0.1.98
Netgear Ex6100v2
Netgear Ex6150v2 Firmware<1.0.1.98
Netgear Ex6150v2
Netgear Ex6250 Firmware<1.0.0.134
Netgear Ex6250
Netgear Ex6400 Firmware<1.0.2.158
Netgear Ex6400
Netgear Ex6400v2 Firmware<1.0.0.134
Netgear Ex6400v2
Netgear Ex6410 Firmware<1.0.0.134
Netgear Ex6410
Netgear Ex6420 Firmware<1.0.0.134
Netgear Ex6420
Netgear Ex7300 Firmware<1.0.2.158
Netgear Ex7300
Netgear Ex7300v2 Firmware<1.0.0.134
Netgear Ex7300v2
Netgear Ex7320 Firmware<1.0.0.134
Netgear Ex7320
Netgear Ex7700 Firmware<1.0.0.216
NETGEAR EX7700
NETGEAR R7800<1.0.1.232
Netgear Ex8000
Netgear Lbr20 Firmware<2.6.3.50
Netgear Lbr20
NETGEAR R7800 firmware<1.0.2.80
NETGEAR R7800
Netgear R8900 Firmware<1.0.5.28
NETGEAR R8900
Netgear R9000 Firmware<1.0.5.28
NETGEAR R9000
Netgear Rbk12 Firmware<2.7.2.104
Netgear Rbk12
Netgear Rbk13 Firmware<2.7.2.104
Netgear Rbk13
NETGEAR R7800<2.7.2.104
NETGEAR R7800
NETGEAR R7800<2.7.2.104
Netgear Rbk15
Netgear Rbk20 Firmware<2.6.2.104
Netgear Rbk20
Netgear Rbk23 Firmware<2.7.2.104
Netgear Rbk23
Netgear Rbk40 Firmware<2.6.2.104
Netgear Rbk40
NETGEAR R7800<2.6.2.104
NETGEAR R7800
Netgear Rbk43s Firmware<2.6.2.104
NETGEAR R7800
Netgear Rbk44 Firmware<2.6.2.104
NETGEAR R7800
Netgear Rbk50 Firmware<2.7.2.104
Netgear Rbk50
NETGEAR R7800<2.7.2.104
Netgear Rbk53
Netgear Rbr10 Firmware<2.6.2.104
Netgear Rbr10
Netgear Rbr20 Firmware<2.6.2.104
Netgear Rbr20
Netgear Rbr40 Firmware<2.6.2.104
Netgear Rbr40
Netgear Rbr50 Firmware<2.7.2.104
Netgear Rbr50
Netgear Rbs10 Firmware<2.6.2.104
Netgear Rbs10
Netgear Rbs20 Firmware<2.6.2.104
Netgear Rbs20
Netgear Rbs40 Firmware<2.6.2.104
Netgear Rbs40
Netgear Rbs50 Firmware<2.7.2.104
Netgear Rbs50
Netgear Rbs50y Firmware<2.6.2.104
Netgear Rbs50y
NETGEAR R7800<2.3.2.114
NETGEAR R7800
Netgear Xr500 Firmware<2.3.2.114
NETGEAR XR500
Netgear Xr700 Firmware<1.0.1.38
Netgear Xr700

Remedy

https://kb.netgear.com/000062883/Security-Advisory-for-Multiple-Vulnerabilities-on-Some-Routers-Satellites-and-Extenders

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