CVE-2005-2625 in CPAINT
Summary
by MITRE
Incomplete blacklist vulnerability in the checkBlacklist function in CPAINT allows remote attackers to execute arbitrary commands via the (1) ExecuteGlobal function or (2) GetRef statement, which is not included in the blacklist.
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Analysis
by VulDB Data Team • 07/27/2017
The vulnerability described in CVE-2005-2625 represents a critical security flaw in the CPAINT framework's input validation mechanism. This issue stems from an incomplete blacklist implementation within the checkBlacklist function, which fails to properly sanitize user input before processing. The vulnerability specifically affects the ExecuteGlobal function and GetRef statement, both of which are not adequately blocked by the existing security restrictions. This incomplete blacklist creates a significant attack surface that remote adversaries can exploit to gain unauthorized system access and execute malicious code. The flaw demonstrates a fundamental weakness in the security model where the system relies on a predetermined list of forbidden operations rather than implementing robust input validation and sanitization techniques.
The technical nature of this vulnerability aligns with CWE-20, which describes improper input validation, and CWE-94, which addresses arbitrary code execution through untrusted input. The flaw operates at the application level where user-supplied data is processed without adequate sanitization, allowing attackers to bypass security controls by leveraging functions that were not included in the original blacklist. When an attacker submits malicious input containing the ExecuteGlobal function or GetRef statement, the system's insufficient validation allows these operations to proceed, potentially enabling complete system compromise. This vulnerability type falls under the ATT&CK technique T1059.007, which covers command and scripting interpreter execution through indirect command injection, where attackers can manipulate application functions to execute arbitrary code.
The operational impact of this vulnerability extends beyond simple code execution to encompass full system compromise and potential data exfiltration. Remote attackers can leverage this flaw to execute arbitrary commands on vulnerable systems, potentially leading to privilege escalation, persistent backdoor installation, and unauthorized access to sensitive information. The vulnerability affects systems using CPAINT framework components where the checkBlacklist function is implemented, particularly those that process user input through the affected functions. Organizations running applications that utilize this framework without proper input validation or additional security layers are at significant risk of exploitation. The incomplete blacklist approach creates a false sense of security since the system appears to be protected but fails to account for all potential attack vectors.
Mitigation strategies for this vulnerability require immediate implementation of comprehensive input validation and sanitization measures. Organizations should enhance their security controls by implementing allowlists instead of blacklists, ensuring that only explicitly permitted operations are allowed while all others are blocked. The system should be updated to include the ExecuteGlobal function and GetRef statement in the security restrictions, and additional validation layers should be implemented to prevent any unauthorized command execution. Security patches should be applied to update the checkBlacklist function to properly handle all potentially dangerous operations. Network segmentation and access controls should be implemented to limit exposure, while monitoring systems should be deployed to detect suspicious command execution patterns. Regular security assessments and code reviews should be conducted to identify similar incomplete blacklist implementations that may exist in other parts of the application architecture.