CVE-2009-4854 in TalkBack
Summary
by MITRE
addons/import.php in TalkBack 2.3.14 allows remote attackers to execute arbitrary commands via the result parameter.
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Analysis
by VulDB Data Team • 12/03/2024
The vulnerability identified as CVE-2009-4854 resides within the TalkBack 2.3.14 web application, specifically in the addons/import.php component. This represents a critical command injection flaw that enables remote attackers to execute arbitrary system commands on the affected server. The vulnerability stems from insufficient input validation and sanitization within the result parameter handling mechanism, creating an avenue for malicious actors to inject and execute harmful commands directly on the target system.
This command injection vulnerability operates through a classic security flaw where user-controllable input is directly incorporated into system command execution without proper sanitization or validation. The result parameter in the import.php script appears to accept external input and subsequently passes it to system execution functions, allowing attackers to manipulate the command flow and execute unauthorized operations. The flaw aligns with CWE-77 which categorizes command injection vulnerabilities as those where untrusted data is used to construct system commands without proper validation or escaping mechanisms. This type of vulnerability can lead to complete system compromise when exploited by skilled attackers.
The operational impact of this vulnerability is severe and multifaceted. Remote attackers can leverage this flaw to execute arbitrary code with the privileges of the web application user, potentially escalating to system administrator level access depending on the server configuration. Attackers may perform various malicious activities including data exfiltration, system reconnaissance, installation of backdoors, or complete system takeover. The vulnerability affects the confidentiality, integrity, and availability of the affected system, as unauthorized users can manipulate the application to perform unintended operations. The attack surface extends beyond immediate command execution to include potential lateral movement within networks and further exploitation of related systems.
Mitigation strategies for this vulnerability must address both immediate remediation and long-term security hardening measures. The primary solution involves implementing proper input validation and sanitization for all user-controllable parameters, particularly those used in system command execution contexts. Organizations should apply the vendor-provided patch or upgrade to a non-vulnerable version of TalkBack as soon as possible. Input filtering should be implemented using allow-list validation techniques rather than deny-list approaches, ensuring that only expected and safe characters are permitted in the result parameter. Additionally, implementing proper privilege separation and using secure coding practices such as parameterized queries and proper command execution methods can prevent similar vulnerabilities from occurring. Security controls should include network segmentation, web application firewalls, and monitoring for suspicious command execution patterns. This vulnerability demonstrates the critical importance of input validation and the potential consequences of insecure command handling in web applications, aligning with ATT&CK technique T1059.001 for command and script injection. Organizations should conduct comprehensive security assessments to identify similar vulnerabilities in other applications and implement robust security development lifecycle practices to prevent future occurrences.