CVE-2008-4306 in Linux
Summary
by MITRE
Buffer overflow in enscript before 1.6.4 has unknown impact and attack vectors, possibly related to the font escape sequence.
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Analysis
by VulDB Data Team • 08/20/2019
The vulnerability identified as CVE-2008-4306 represents a buffer overflow condition within the enscript document formatting tool version 1.6.3 and earlier. This flaw exists in the handling of font escape sequences, which are control characters used to modify text formatting in terminal environments. The vulnerability was discovered in a tool widely used for converting text files into formatted documents suitable for printing or viewing, making it a critical security concern for systems that rely on document processing capabilities.
The technical nature of this buffer overflow stems from insufficient bounds checking when processing font escape sequences within the enscript utility. When the application encounters specially crafted input containing malformed escape sequences, it fails to properly validate the length of data being processed, leading to memory corruption. This type of vulnerability falls under the CWE-121 category of stack-based buffer overflow, though the specific implementation details suggest it may involve heap memory corruption given the nature of escape sequence processing. The vulnerability is particularly concerning because it could potentially be exploited through crafted input files that contain malicious escape sequences designed to overwrite adjacent memory locations.
The operational impact of this vulnerability extends beyond simple denial of service scenarios, as buffer overflows of this nature can potentially lead to arbitrary code execution on vulnerable systems. Attackers could craft malicious documents or input files containing specially designed font escape sequences that trigger the buffer overflow condition. When processed by the vulnerable enscript version, these inputs could allow remote attackers to execute arbitrary code with the privileges of the user running the application. This makes the vulnerability particularly dangerous in multi-user environments or when enscript is used in automated document processing pipelines. The attack vectors are not well-documented in the initial CVE description, but would likely involve file processing through enscript, potentially through web interfaces or automated batch processing systems.
The mitigation strategy for this vulnerability requires immediate upgrading to enscript version 1.6.4 or later, which contains the necessary patches to address the buffer overflow condition. System administrators should also implement input validation measures to prevent processing of untrusted documents through the enscript utility. Additional defensive measures include running the application with reduced privileges, implementing proper memory protection mechanisms such as stack canaries, and conducting regular security audits of document processing workflows. Organizations should also consider implementing network segmentation to limit exposure of systems running vulnerable versions of enscript, particularly in environments where document processing is performed on untrusted input data. This vulnerability demonstrates the importance of proper input validation in text processing applications and aligns with ATT&CK technique T1059.007 for command and scripting interpreter execution through document processing tools. The incident also highlights the need for regular security updates and vulnerability management programs to prevent exploitation of known buffer overflow vulnerabilities in widely used system utilities.