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The vulnerability resides in the VPN web server component of Cisco ASA and FTD software. It stems from improper validation of user-supplied input within HTTP(S) requests. An attacker with valid VPN user credentials can exploit this flaw by sending a specially crafted, malicious HTTP request to the targeted device’s web interface. The system fails to properly sanitize this input, leading to a memory corruption issue. This corruption can be leveraged to overwrite critical memory structures and hijack the execution flow of the application. Ultimately, this allows the attacker to execute arbitrary commands with root-level privileges on the underlying operating system. The attack is network-based, requires low attack complexity, and only low-level privileges (a VPN user account). Due to the root-level code execution, the impact is a complete compromise of the firewall device.
Platform: Cisco ASA/FTD
Version: Multiple Versions
Vulnerability: Input Validation RCE
Severity: Critical
date: 2023-10
Prediction: Patch Available
What Undercode Say:
curl -k -H "Authorization: Basic [bash]" -d "malicious_payload" https://<target_ip>/
// Example payload structure targeting heap corruption
struct exploit_payload {
char overflow_buffer[bash];
void new_return_address;
};
How Exploit:
An authenticated attacker sends a crafted HTTP POST request containing malicious code to the VPN web server, triggering a buffer overflow and achieving remote code execution as the root user.
Protection from this CVE:
Apply Cisco security patches. Restrict VPN user access through least privilege principles. Implement network segmentation for management interfaces.
Impact:
Complete system compromise, enabling unauthorized network access, data exfiltration, and use of the device as a foothold for lateral movement.
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Sources:
Reported By: www.cve.org
Extra Source Hub:
Undercode
