CVE-2006-6541 in Animated Smiley Generator
Summary
by MITRE
** DISPUTED ** PHP remote file inclusion vulnerability in signer/final.php in warez distributions of Animated Smiley Generator allows remote attackers to execute arbitrary PHP code via a URL in the smiley parameter. NOTE: the vendor disputes this issue, stating that only Warez versions of Animated Smiley Generator were affected, not the developer-provided software: "Legitimately purchased applications do not allow this exploit."
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Analysis
by VulDB Data Team • 08/08/2024
The vulnerability described in CVE-2006-6541 represents a classic remote file inclusion flaw that emerged during the early 2000s software security landscape. This issue was identified in the signer/final.php component of the Animated Smiley Generator application, specifically within warez distributions that were illegally distributed and modified versions of the software. The flaw resides in how the application processes user input through the smiley parameter, which accepts URL values that are subsequently included or executed within the PHP runtime environment. This type of vulnerability falls under the category of CWE-88, which specifically addresses improper neutralization of special elements used in an OS command, and more broadly relates to CWE-94, which covers the execution of arbitrary code due to insufficient input validation.
The technical exploitation of this vulnerability occurs when an attacker crafts a malicious URL and passes it through the smiley parameter to the vulnerable script. The PHP application fails to properly validate or sanitize this input, allowing the attacker to inject and execute arbitrary PHP code on the target server. This represents a critical security flaw that enables remote code execution, allowing attackers to potentially gain full control over the affected system, install backdoors, steal sensitive data, or perform other malicious activities. The vulnerability demonstrates poor input validation practices and highlights the importance of proper sanitization of user-supplied data before it is processed by the application's execution engine.
The operational impact of this vulnerability is significant, particularly within the context of the software distribution model that existed during the 2000s. The vendor's official stance that only warez versions were affected suggests that legitimate users of the software were not exposed to this particular vulnerability, as the modifications required for exploitation were typically introduced through unauthorized distribution channels. This distinction is important for understanding the scope of risk and for security practitioners to focus their mitigation efforts appropriately. The vulnerability would have been particularly dangerous in web hosting environments where multiple applications share resources, as successful exploitation could potentially lead to compromise of entire server infrastructures.
Security mitigations for this vulnerability should focus on input validation and sanitization practices that align with established security frameworks and threat modeling approaches. Organizations should implement proper parameter validation that rejects or sanitizes any input containing potentially dangerous characters or URL patterns that could lead to remote file inclusion attacks. The principle of least privilege should be enforced, ensuring that web applications operate with minimal required permissions and that all user inputs are properly escaped or encoded before processing. Additionally, this vulnerability underscores the importance of source code review and the necessity of using only legitimate software distributions, as unauthorized modifications often introduce security flaws that are not present in vendor-approved versions. The ATT&CK framework would categorize this vulnerability under T1190 for exploitation of remote services and T1059 for command and scripting interpreter, reflecting both the attack surface and execution methods involved in such exploits.