CVE-2012-0981 in phpShowtime
Summary
by MITRE
Directory traversal vulnerability in phpShowtime 2.0 allows remote attackers to list arbitrary directories and image files via a .. (dot dot) in the r parameter to index.php. NOTE: Some of these details are obtained from third party information.
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Analysis
by VulDB Data Team • 03/18/2025
The vulnerability identified as CVE-2012-0981 represents a critical directory traversal flaw in phpShowtime version 2.0, a web-based photo gallery application that was widely used for displaying image collections online. This weakness stems from insufficient input validation mechanisms within the application's handling of user-supplied parameters, specifically the r parameter in the index.php script. The vulnerability allows remote attackers to manipulate the application's file system access by injecting directory traversal sequences, thereby enabling unauthorized access to arbitrary directories and image files beyond the intended scope of the application.
The technical exploitation of this vulnerability occurs through the manipulation of the r parameter in the index.php file, where attackers can append .. (dot dot) sequences to navigate upward through the directory structure. When the application processes these malicious inputs without proper sanitization, it fails to validate or restrict the paths being accessed, allowing attackers to traverse the file system hierarchy and potentially access sensitive files, configuration data, or other system resources that should remain protected from external access. This flaw falls under the Common Weakness Enumeration category CWE-22, which specifically addresses improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal attacks.
The operational impact of this vulnerability extends beyond simple information disclosure, as it provides attackers with the capability to enumerate entire directory structures and access files that may contain sensitive information such as database credentials, application configuration files, or even source code that could reveal additional attack vectors. Remote attackers can leverage this vulnerability to gain unauthorized access to the underlying file system, potentially leading to complete system compromise through the exploitation of other vulnerabilities discovered during the reconnaissance phase. The attack surface is particularly concerning given that phpShowtime was often deployed on public web servers without adequate network segmentation or access controls, making the vulnerability exploitable from any location on the internet.
Security practitioners should implement multiple layers of defense to mitigate this vulnerability, starting with immediate patching of affected phpShowtime installations to version 2.1 or later, which contains the necessary input validation fixes. Additionally, network administrators should consider implementing web application firewalls that can detect and block directory traversal patterns in incoming requests, while also ensuring that the application runs with minimal required privileges and that sensitive files are properly protected through file system permissions. The vulnerability demonstrates the critical importance of input validation and proper access controls as outlined in the MITRE ATT&CK framework's techniques for privilege escalation and defense evasion, where directory traversal attacks are categorized under initial access and persistence mechanisms that can lead to more sophisticated compromise operations. Organizations should also conduct regular security assessments to identify similar vulnerabilities in legacy applications and ensure proper security configuration practices are maintained throughout their infrastructure.