CVE-2021-27253: (Pwn2Own) NETGEAR Nighthawk R7800 Heap-based Buffer Overflow Remote Code Execution Vulnerability
This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of NETGEAR Nighthawk R7800. Although authentication is required to exploit this vulnerability, the existing authentication mechanism can be bypassed. The specific flaw exists within the handling of the rcservice parameter provided to applybind.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.
Affected Software
Remediation
Event History
Frequently Asked Questions
What is the severity of CVE-2021-27253?
CVE-2021-27253 has a severity rating that suggests it allows network-adjacent attackers to execute arbitrary code on vulnerable NETGEAR devices.
How do I fix CVE-2021-27253?
To fix CVE-2021-27253, it is recommended to update the firmware of affected NETGEAR devices to the latest version provided by the vendor.
Which NETGEAR devices are affected by CVE-2021-27253?
Affected NETGEAR devices include the Nighthawk R7800, among several other models listed in the advisory.
Can CVE-2021-27253 be exploited without authentication?
Although authentication is generally required, the flaw in CVE-2021-27253 can allow attackers to bypass this authentication.
What type of vulnerability is CVE-2021-27253?
CVE-2021-27253 is classified as a remote code execution vulnerability that impacts certain NETGEAR routers.