CVE-2004-1186 in Enscript
Summary
by MITRE
Multiple buffer overflows in enscript 1.6.3 allow remote attackers or local users to cause a denial of service (application crash).
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Analysis
by VulDB Data Team • 05/30/2019
The vulnerability identified as CVE-2004-1186 affects enscript version 1.6.3, a widely used text formatting and printing utility that converts plain text files into formatted documents with syntax highlighting. This flaw manifests as multiple buffer overflows that can be exploited by both remote attackers and local users to trigger application crashes, effectively causing denial of service conditions. The vulnerability stems from inadequate input validation and memory management within the enscript utility's processing routines, particularly when handling malformed or excessively large input files. These buffer overflows occur when the application fails to properly bounds-check data structures during text processing operations, allowing malicious input to overwrite adjacent memory regions. The impact extends beyond simple crashes as the vulnerability can potentially be leveraged for more severe consequences including arbitrary code execution, though the primary manifestation in this case is denial of service.
The technical implementation of this vulnerability involves multiple distinct buffer overflow conditions within the enscript codebase, each affecting different processing paths when handling various text input formats. These overflows typically occur in functions responsible for parsing input files, managing character encoding conversions, and handling various formatting options. The CWE (Common Weakness Enumeration) classification for this vulnerability aligns with CWE-121, which describes stack-based buffer overflow conditions, and potentially CWE-122 for heap-based buffer overflows depending on the specific implementation details. Attackers can exploit these conditions by crafting specially formatted input files or by manipulating the application's command-line parameters to cause memory corruption during processing. The vulnerability is particularly concerning because enscript is often used in automated environments and system administration tasks, making it a prime target for exploitation in broader attack chains.
The operational impact of CVE-2004-1186 extends significantly beyond simple service disruption, as the vulnerability can affect system availability in critical environments where enscript is used for document processing and printing operations. When exploited, the buffer overflows cause the application to terminate unexpectedly, potentially leaving users unable to process important documents or causing cascading failures in automated workflows that depend on enscript functionality. This vulnerability particularly affects Unix-like systems where enscript is commonly deployed for system administration and document formatting tasks. The attack surface is broad since enscript is often used in shell scripts, automated printing systems, and document conversion utilities, meaning that exploitation can occur through multiple vectors including web-based interfaces, automated processing pipelines, or direct command execution. The vulnerability also demonstrates poor defensive programming practices that can be mapped to ATT&CK tactics such as privilege escalation through service exploitation and denial of service through application corruption.
Mitigation strategies for CVE-2004-1186 should focus on immediate patching of the affected enscript version 1.6.3, as this represents the most effective solution to address the underlying buffer overflow conditions. Organizations should also implement input validation measures to filter potentially malicious files before processing them through enscript, along with monitoring for unusual application behavior that might indicate exploitation attempts. System administrators should consider restricting the execution privileges of enscript in automated environments and implementing proper access controls to limit potential attack vectors. The vulnerability highlights the importance of proper memory management and bounds checking in software development practices, with recommendations to adopt defensive programming techniques and regular security code reviews. Additionally, deployment of intrusion detection systems that monitor for known exploit patterns targeting buffer overflow conditions can provide early warning of attempted exploitation, while regular security assessments should verify that similar vulnerabilities do not exist in other applications within the system environment.