CVE-2007-5934 in Structures Datagrid Datasource Mdb2
Summary
by MITRE
The LOB functionality in PEAR MDB2 before 2.5.0a1 interprets a request to store a URL string as a request to retrieve and store the contents of the URL, which might allow remote attackers to use MDB2 as an indirect proxy or obtain sensitive information via a URL into a form field in an MDB2 application, as demonstrated by a file:// URL or a URL for an intranet web site.
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Analysis
by VulDB Data Team • 07/31/2019
The vulnerability identified as CVE-2007-5934 represents a critical security flaw in the PEAR MDB2 database abstraction layer, specifically within its LOB (Large Object) functionality. This issue affects versions prior to 2.5.0a1 and demonstrates a dangerous misinterpretation of user input that can be exploited by remote attackers to gain unauthorized access to system resources. The flaw arises from the improper handling of URL strings within the database layer, where the system incorrectly treats any URL as a directive to fetch and store remote content rather than treating it as a simple string value. This behavior creates a fundamental security gap that allows attackers to leverage the database abstraction layer as an unintended proxy mechanism for accessing internal network resources or retrieving sensitive information.
The technical implementation of this vulnerability stems from the lack of proper input validation and sanitization within the MDB2 LOB processing functions. When an application using MDB2 processes user input containing URL strings in form fields, the system automatically attempts to resolve these URLs and retrieve their contents for storage in the database. This automatic resolution occurs regardless of whether the URL is intended as a data value or as an actual network resource reference. The vulnerability is particularly dangerous because it can be exploited with various URL schemes including file:// protocols that can access local system files, or HTTP/HTTPS URLs that can target internal web services. This misinterpretation of input data creates a direct pathway for attackers to bypass normal network security controls and potentially access confidential information that would otherwise be protected by firewall rules or network segmentation.
The operational impact of this vulnerability extends beyond simple data leakage, as it can be leveraged for more sophisticated attacks including internal network reconnaissance, information disclosure, and potential privilege escalation. Attackers can craft malicious inputs that, when processed by the vulnerable MDB2 system, result in the automatic retrieval of sensitive files from the local filesystem or internal web services. This capability transforms the database layer into an unintended attack vector that can bypass traditional security measures such as firewalls, network access controls, and application-level security boundaries. The vulnerability is particularly concerning in enterprise environments where database systems often have elevated privileges and access to sensitive internal resources. According to CWE classification, this represents a weakness in the input validation process and can be categorized under CWE-20, which deals with improper input validation, while the indirect proxy functionality aligns with ATT&CK technique T1090.001 for proxy usage and T1566 for social engineering attacks that leverage application vulnerabilities.
Mitigation strategies for CVE-2007-5934 require immediate implementation of software updates to version 2.5.0a1 or later, which includes proper input validation and sanitization for URL handling within the LOB functionality. Organizations should also implement strict input validation at multiple layers of their application architecture, ensuring that any URL strings are properly escaped or validated before being processed by the database abstraction layer. Network segmentation and access controls should be reviewed to limit the potential impact of successful exploitation, while application-level firewalls or web application firewalls can be configured to block suspicious URL patterns. Additionally, developers should conduct thorough code reviews to identify similar vulnerabilities in other parts of their applications that might be susceptible to similar URL interpretation flaws, and implement proper parameterized queries to prevent any unintended URL resolution during database operations. The vulnerability highlights the importance of security testing and validation of database abstraction layers, particularly in environments where applications handle untrusted input from external sources.