CVE-2007-1929 in Beryo
Summary
by MITRE
Directory traversal vulnerability in downloadpic.php in Beryo 2.0, and possibly other versions including 2.4, allows remote attackers to read arbitrary files via a .. (dot dot) in the chemin parameter.
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Analysis
by VulDB Data Team • 09/03/2024
The vulnerability identified as CVE-2007-1929 represents a critical directory traversal flaw in the Beryo content management system version 2.0 and potentially affecting version 2.4. This security weakness resides within the downloadpic.php script which processes file download requests through the chemin parameter. The flaw enables malicious actors to access arbitrary files on the server by manipulating the chemin parameter with directory traversal sequences such as .. or similar constructs that navigate upward through the file system hierarchy. The vulnerability stems from insufficient input validation and sanitization of user-supplied parameters before they are processed by the application's file handling mechanisms.
The technical implementation of this vulnerability aligns with CWE-22, which specifically addresses improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal attacks. Attackers can exploit this weakness by crafting malicious URLs that include directory traversal sequences in the chemin parameter, allowing them to bypass normal access controls and retrieve files that should remain protected. The impact extends beyond simple file enumeration to potentially include sensitive data exposure, system compromise, and unauthorized access to configuration files, database credentials, or other critical system resources. This vulnerability operates at the application layer and requires no special privileges to exploit, making it particularly dangerous as it can be leveraged by remote unauthenticated attackers.
The operational impact of CVE-2007-1929 is severe and multifaceted, as it can lead to complete system compromise when attackers successfully exploit the directory traversal vulnerability. An attacker could potentially access sensitive files such as database configuration files containing administrative credentials, application source code revealing implementation details, or system configuration files that could aid in further exploitation. The vulnerability also enables attackers to read system files that may contain sensitive information, potentially leading to privilege escalation or lateral movement within the network. The attack surface is particularly concerning because it affects multiple versions of the Beryo platform, indicating a widespread exposure across affected installations.
Mitigation strategies for this vulnerability must address both immediate remediation and long-term security improvements. The most effective immediate solution involves implementing proper input validation and sanitization of all user-supplied parameters, particularly those used in file handling operations. This includes implementing strict path validation that prevents directory traversal sequences from being processed, utilizing allowlists of acceptable file paths, and employing secure file access mechanisms that do not rely on user input for file resolution. Organizations should also implement proper access controls and privilege separation to limit the impact of successful exploitation attempts. The remediation aligns with ATT&CK technique T1078 which addresses valid accounts and T1566 which covers credential harvesting, as this vulnerability could lead to unauthorized access to system resources and potential credential exposure. Regular security audits and input validation testing should be implemented to prevent similar vulnerabilities from emerging in future versions of the application.