CVE-2007-1343 in WebCalendar
Summary
by MITRE
includes/functions.php in Craig Knudsen WebCalendar before 1.0.5 does not protect the noSet variable from external modification, which allows remote attackers to set arbitrary global variables via a URL with modified values in the noSet parameter, which leads to resultant vulnerabilities that probably include remote file inclusion and other issues.
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Analysis
by VulDB Data Team • 07/16/2019
The vulnerability identified as CVE-2007-1343 resides within the WebCalendar application version 1.0.4 and earlier, specifically in the includes/functions.php file where inadequate input validation and variable handling creates a critical security flaw. This issue stems from the application's failure to properly sanitize the noSet parameter received through URL requests, allowing malicious actors to manipulate global variable assignments through crafted web requests. The vulnerability classifies under CWE-94, which encompasses "Improper Control of Generation of Code," as the application fails to properly control the execution flow when processing external input that influences variable declarations.
The technical implementation flaw occurs when the WebCalendar application processes the noSet parameter without proper validation or sanitization, enabling attackers to inject arbitrary values that subsequently affect the global variable scope. This creates a dangerous condition where external input directly influences the application's internal state, potentially allowing attackers to modify critical variables that control application behavior. When the noSet parameter is manipulated, it can cause the application to set global variables with attacker-controlled values, which can subsequently be leveraged to execute arbitrary code or manipulate application logic.
The operational impact of this vulnerability extends beyond simple variable manipulation, as it opens pathways for more severe exploits including remote file inclusion attacks. Attackers can leverage this vulnerability to inject malicious code or include remote files that execute on the target system, potentially leading to complete system compromise. The vulnerability's exploitation capabilities align with ATT&CK technique T1505.003, "Server Software Component: Web Shell," as the ability to set arbitrary global variables can enable persistent access through malicious code injection. Additionally, this flaw can facilitate privilege escalation and data exfiltration attacks, as the modified global variables may control access controls or data handling procedures.
Mitigation strategies for CVE-2007-1343 require immediate implementation of input validation and parameter sanitization measures within the WebCalendar application. The most effective approach involves implementing strict validation of the noSet parameter to ensure it contains only expected values or is properly escaped before processing. Security patches should enforce proper variable scoping and prevent external modification of global variables through URL parameters. Organizations should also implement web application firewalls to monitor and filter suspicious parameter values, while ensuring that all input is properly validated against a whitelist of acceptable values. The vulnerability demonstrates the importance of proper input validation as outlined in OWASP Top 10 2017 category A03: "Injection" and should be addressed through comprehensive code review processes that examine all external input handling mechanisms. Regular security assessments and application hardening procedures should be implemented to prevent similar vulnerabilities from emerging in other components of the application stack, as this flaw represents a fundamental weakness in the application's security architecture that could be exploited to gain unauthorized access to system resources.