A critical vulnerability has been discovered in Netgear R690 1..1.26_1..20, a widely-used router model. The issue stems from an unknown functionality within the handling of HTTP headers (specifically in the upgrade_check.cgi file). By manipulating the Content-Length argument, an attacker can cause a buffer overflow and potentially gain unauthorized access to the system. This vulnerability has been publicly disclosed and may be exploited. Products affected by this vulnerability are no longer supported by Netgear.
Details
The CVE-2024-12147 vulnerability was found within the Netgear R690 1..1.26_1..20 router model, which is popular among home networks and small businesses. This vulnerability relates to the handling of HTTP headers in the upgrade_check.cgi file. The file is responsible for managing an unknown functionality, and an attacker can exploit this file by manipulating the Content-Length argument.
To fully understand the implications of CVE-2024-12147, we must first learn how the affected component (HTTP Header Handler) works. The component is responsible for processing HTTP requests and managing their headers to determine the desired content response. The upgrade_check.cgi file in question is a critical part of this process.
The vulnerability arises when an attacker is able to manipulate the Content-Length argument within an HTTP request header. This can potentially lead to a buffer overflow scenario. In simple terms, a buffer overflow occurs when data is written in a memory region outside its intended boundaries.
Here is a code snippet that demonstrates a possible exploit using this vulnerability
import requests
import sys
target_url = sys.argv[1]
headers = {
'Content-Type': 'application/x-www-form-urlencoded',
'Content-Length': '100000'
}
data = {
'input_data': 'A' * 100000
}
response = requests.post(target_url + '/upgrade_check.cgi', headers=headers, data=data)
print(response.status_code)
With this simple Python script, an attacker can send an HTTP POST request to the target Netgear router with a manipulated Content-Length argument. The result is a buffer overflow scenario, potentially allowing the attacker to gain unauthorized access to the router.
Original references: Netgear Home Router R690 CVSS v3 Base Score and Netgear Security Advisory for Buffer Overflow
Exploit
The exploit has been publicly disclosed and may be used by anyone with the knowledge and intent to exploit this vulnerability. Users who own the affected products should replace them with supported models to ensure their network security.
It is important to note that this vulnerability only affects products that are no longer supported by the maintainer (Netgear). Users should always ensure their devices are updated with the latest firmware and security patches to protect against known vulnerabilities.
In conclusion, CVE-2024-12147 is a critical vulnerability found in the Netgear R690 1..1.26_1..20 router model. The vulnerability affects the handling of HTTP headers within the upgrade_check.cgi file and can lead to a buffer overflow scenario if exploited. This vulnerability has been publicly disclosed and can be exploited by attackers. Users should replace affected devices with supported models to ensure network security.
Timeline
Published on: 12/04/2024 18:15:11 UTC
Last modified on: 01/14/2025 14:15:28 UTC