CVE-2004-1297 in unrtf
Summary
by MITRE
Buffer overflow in the process_font_table function in convert.c for unrtf 0.19.3 allows remote attackers to execute arbitrary code via a crafted RTF file.
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Analysis
by VulDB Data Team • 06/07/2019
The vulnerability identified as CVE-2004-1297 represents a critical buffer overflow flaw within the unrtf 0.19.3 library that processes rich text format documents. This issue specifically manifests in the process_font_table function located within the convert.c source file, creating a pathway for remote code execution when processing malformed RTF content. The vulnerability stems from inadequate input validation and bounds checking during the parsing of font table data structures within RTF files, allowing attackers to craft malicious documents that trigger memory corruption.
The technical implementation of this buffer overflow occurs when the process_font_table function fails to properly validate the length of font table entries before copying data into fixed-size buffers. This classic programming error enables attackers to overwrite adjacent memory locations with carefully crafted payload data, potentially leading to arbitrary code execution with the privileges of the affected application. The vulnerability is particularly dangerous because it can be exploited remotely through web-based RTF document delivery, making it accessible to attackers without requiring local system access or user interaction beyond viewing the malicious document.
From an operational perspective, this vulnerability poses significant risks to organizations that process RTF documents as part of their normal operations, including email servers, document conversion services, and content management systems. The remote exploit capability means that attackers can deliver malicious RTF files through various channels such as email attachments, web downloads, or document sharing platforms. The potential impact extends beyond immediate code execution to include complete system compromise, data exfiltration, and lateral movement within network environments. This vulnerability directly aligns with CWE-121, which describes heap-based buffer overflow conditions, and represents a classic example of how improper input handling can lead to severe security consequences.
The exploitation of CVE-2004-1297 typically follows attack patterns consistent with the ATT&CK framework's execution and privilege escalation tactics. Attackers often leverage this vulnerability through initial access vectors such as spear-phishing campaigns or web-based attacks targeting vulnerable document processing applications. The successful exploitation can result in persistent access to compromised systems, making it a preferred target for advanced persistent threats. Organizations should implement multiple layers of defense including input validation, memory protection mechanisms, and regular security updates to mitigate this vulnerability. Network segmentation and email filtering solutions can provide additional protection against exploitation attempts, while regular security assessments should verify the absence of similar vulnerabilities in other document processing libraries and applications.