CVE-2007-6176 in KB-Bestellsystem
Summary
by MITRE
kb_whois.cgi in K+B-Bestellsystem (aka KB-Bestellsystem) allows remote attackers to execute arbitrary commands via shell metacharacters in the (1) domain or (2) tld parameter in a check_owner action.
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Analysis
by VulDB Data Team • 10/11/2024
The vulnerability described in CVE-2007-6176 represents a critical command injection flaw within the kb_whois.cgi component of the K+B-Bestellsystem web application, also known as KB-Bestellsystem. This system is designed for order processing and management, but the identified weakness exposes it to remote code execution attacks through improper input validation. The vulnerability specifically affects the check_owner action functionality where user-supplied parameters are directly incorporated into system commands without adequate sanitization or escaping mechanisms.
The technical flaw manifests in the handling of two distinct parameters: domain and tld within the check_owner action of the kb_whois.cgi script. When attackers provide malicious input containing shell metacharacters such as semicolons, ampersands, or backticks in either parameter, the application fails to properly escape or validate these inputs before passing them to underlying system commands. This allows attackers to inject arbitrary shell commands that execute with the privileges of the web server process, potentially enabling full system compromise. The vulnerability aligns with CWE-77, which specifically addresses command injection flaws where untrusted data is incorporated into shell commands without proper validation or escaping.
The operational impact of this vulnerability is severe and multifaceted, as it provides remote attackers with the capability to execute arbitrary commands on the affected system. An attacker could leverage this flaw to gain unauthorized access to system resources, escalate privileges, install backdoors, or conduct further reconnaissance activities. The vulnerability's remote nature means that attackers do not require physical access to the system or prior authentication credentials to exploit it. This makes the attack surface significantly broader and increases the potential for widespread compromise. From an adversary perspective, this vulnerability maps to ATT&CK technique T1059.001 for command and scripting interpreter, specifically shell scripting, allowing for lateral movement and persistence within the compromised environment.
Mitigation strategies for this vulnerability should focus on immediate input validation and sanitization measures. The most effective approach involves implementing proper parameter validation and escaping before any user input is processed by system commands. Developers should employ whitelisting techniques for allowed characters and reject any input containing shell metacharacters. Additionally, the application should be updated to use secure APIs that do not directly invoke shell commands with user-supplied data. Organizations should also consider implementing web application firewalls to detect and block suspicious command injection patterns. Regular security audits and penetration testing should be conducted to identify similar vulnerabilities in other components of the system. The vulnerability demonstrates the critical importance of following secure coding practices and adhering to the principle of least privilege when executing system commands in web applications.