Arbitrary Code Execution Vulnerability in NETGEAR R7800 Firmware
CVE-2021-27256

8.8HIGH

Key Information:

Vendor

Netgear
Status
R7800
Vendor
CVE Published:
5 March 2021

What is CVE-2021-27256?

A vulnerability exists in the handling of the rc_service parameter provided to apply_save.cgi in NETGEAR R7800 firmware version 1.0.2.76, allowing network-adjacent attackers to execute arbitrary code. This occurs due to insufficient validation of user-supplied strings before they are processed for system calls. While the vulnerability requires authentication, the mechanism can be easily bypassed, ultimately enabling attackers to execute code with root privileges.

Affected Version(s)

R7800 firmware version 1.0.2.76

References

https://kb.netgear.com/000062883/Security-Advisory-for-Mu...
x_refsource_MISC
https://www.zerodayinitiative.com/advisories/ZDI-21-262/
x_refsource_MISC

CVSS V3.1

Score:
8.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Adjacent Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

takeshi
.