CVE-2004-0888 in Xpdf
Summary
by MITRE
Multiple integer overflows in xpdf 2.0 and 3.0, and other packages that use xpdf code such as CUPS, gpdf, and kdegraphics, allow remote attackers to cause a denial of service (crash) and possibly execute arbitrary code, a different set of vulnerabilities than those identified by CVE-2004-0889.
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Analysis
by VulDB Data Team • 03/10/2021
The vulnerability described in CVE-2004-0888 represents a critical security flaw affecting multiple PDF processing libraries and applications that rely on xpdf code. This issue manifests as integer overflows within the xpdf 2.0 and 3.0 libraries, which are widely used components in various operating systems and software packages. The affected ecosystem includes major applications such as CUPS print system, gpdf document viewer, and kdegraphics suite, demonstrating the widespread impact of this vulnerability across different software domains. These integer overflow conditions occur when applications process malformed PDF files, specifically when handling certain data structures that exceed the maximum limits of integer variables. The vulnerability is particularly dangerous because it can be exploited remotely through crafted PDF documents, allowing attackers to trigger system crashes or potentially achieve arbitrary code execution on vulnerable systems.
The technical nature of this vulnerability aligns with CWE-190, which specifically addresses integer overflow conditions, and represents a classic example of how improper input validation can lead to serious security consequences. When xpdf encounters malformed data structures within PDF files, particularly in areas such as font handling, stream processing, or object parsing, the integer variables used to manage memory allocation or buffer sizes can exceed their maximum allowable values. This overflow condition typically results in unpredictable behavior where the application may attempt to allocate negative memory amounts or access invalid memory locations, causing immediate crashes. However, in certain scenarios, attackers can manipulate the overflow conditions to overwrite critical memory locations, potentially enabling code execution. The vulnerability affects not only the core xpdf library but also all applications that incorporate xpdf functionality, creating a cascading security risk across the entire software ecosystem that depends on these libraries for PDF processing capabilities.
The operational impact of CVE-2004-0889 extends beyond simple denial of service conditions to potentially enable remote code execution, making it a significant threat to system security. When exploited successfully, these integer overflows can allow attackers to compromise systems running vulnerable applications, particularly those that automatically process PDF documents from untrusted sources. The vulnerability is particularly concerning in enterprise environments where print servers, web applications, and email systems might process PDF files without proper sanitization. Attackers could leverage this vulnerability to gain unauthorized access to systems, escalate privileges, or establish persistent access points within network infrastructures. The remote exploitation capability means that systems do not need to be physically accessible to attackers, as malicious PDF documents could be delivered through email attachments, web downloads, or file sharing systems, making the attack surface extremely broad. This vulnerability directly maps to ATT&CK technique T1059.007 for command and control communications and T1203 for legitimate program execution, as compromised systems might be used to further propagate attacks or maintain access.
Mitigation strategies for this vulnerability require immediate patching of affected xpdf libraries and all dependent applications. System administrators should prioritize updating CUPS, gpdf, kdegraphics, and any other software packages that utilize xpdf code to versions containing security fixes. Organizations should implement network segmentation and access controls to limit PDF processing capabilities on critical systems, particularly in environments where untrusted PDF documents might be encountered. Input validation measures should be strengthened to reject malformed PDF files before they reach xpdf processing components. Additionally, monitoring systems should be configured to detect unusual application crashes or memory allocation patterns that might indicate exploitation attempts. Regular security assessments and vulnerability scanning should be conducted to identify any remaining instances of vulnerable software. The remediation process should include comprehensive testing of updated software to ensure that patches do not introduce compatibility issues while maintaining the security benefits of the fixes. Organizations should also consider implementing sandboxing mechanisms for PDF processing to contain potential exploitation attempts within isolated environments, preventing full system compromise even if vulnerabilities are exploited.