CVE-2009-4493 in Application Server
Summary
by MITRE
Orion Application Server 2.0.7 writes data to a log file without sanitizing non-printable characters, which might allow remote attackers to modify a window s title, or possibly execute arbitrary commands or overwrite files, via an HTTP request containing an escape sequence for a terminal emulator.
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Analysis
by VulDB Data Team • 01/13/2025
The vulnerability described in CVE-2009-4493 affects the Orion Application Server version 2.0.7, specifically targeting its logging mechanism that fails to properly sanitize input data before writing to log files. This issue represents a classic case of insufficient input validation and output encoding that can be exploited by malicious actors to manipulate system behavior through carefully crafted HTTP requests. The flaw exists within the server's handling of terminal escape sequences, which are typically used to control terminal display and formatting operations in command-line interfaces and terminal emulators.
The technical exploitation of this vulnerability occurs when an attacker sends an HTTP request containing non-printable characters or escape sequences that the Orion Application Server processes and logs without proper sanitization. When these unsanitized escape sequences are written to log files, they can be interpreted by terminal emulators or other log viewing applications, potentially allowing attackers to modify window titles, execute arbitrary commands, or overwrite files depending on how the log data is processed and displayed. This represents a form of log injection attack that leverages the trust placed in log files as a source of system information.
The operational impact of this vulnerability extends beyond simple data corruption or display manipulation, as it can potentially enable more serious security breaches depending on the environment where the Orion Application Server operates. Attackers could exploit this weakness to manipulate log data that might be used for security monitoring, forensic analysis, or system administration purposes. The vulnerability particularly affects environments where log files are regularly reviewed by system administrators or processed by automated security tools, as the malicious escape sequences could be used to hide malicious activity or redirect system operations. This issue is classified under CWE-117, which addresses improper output neutralization for logs, and aligns with ATT&CK technique T1070.002 for Indicator Removal on Host.
The root cause of this vulnerability stems from inadequate input validation and output encoding practices within the Orion Application Server's logging subsystem. The server fails to implement proper character sanitization when processing user-supplied data that might be included in HTTP requests and subsequently logged to files. This oversight creates an attack surface where maliciously crafted escape sequences can be injected into the logging process, potentially causing unintended behavior in terminal emulators or other applications that process these log files. Security best practices dictate that all user-supplied data should be properly sanitized before being written to log files or other output destinations, particularly when these outputs might be processed by applications that interpret control characters.
Mitigation strategies for this vulnerability should focus on implementing comprehensive input validation and output sanitization mechanisms within the Orion Application Server. System administrators should ensure that all user-supplied data is properly escaped or encoded before being written to log files, with particular attention to non-printable characters and escape sequences. The implementation of proper logging practices that prevent the injection of terminal control sequences represents the most effective approach to addressing this issue. Additionally, regular log file monitoring and review processes should include checks for anomalous character sequences that might indicate exploitation attempts. Organizations should also consider implementing log file access controls and regular integrity checks to detect any unauthorized modifications to log data. This vulnerability highlights the importance of secure coding practices and input validation across all application components, particularly those handling user data or system information that might be processed by external tools or applications.