CVE-2009-0147 in CUPS
Summary
by MITRE
Multiple integer overflows in the JBIG2 decoder in Xpdf 3.02pl2 and earlier, CUPS 1.3.9 and earlier, and other products allow remote attackers to cause a denial of service (crash) via a crafted PDF file, related to (1) JBIG2Stream::readSymbolDictSeg, (2) JBIG2Stream::readSymbolDictSeg, and (3) JBIG2Stream::readGenericBitmap.
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Analysis
by VulDB Data Team • 09/02/2019
The vulnerability identified as CVE-2009-0147 represents a critical security flaw affecting multiple PDF processing applications that implement JBIG2 image compression standards. This issue stems from integer overflow conditions within the JBIG2 decoder component, which is responsible for decompressing JBIG2 compressed image data commonly found in PDF documents. The vulnerability affects widely deployed software including Xpdf version 3.02pl2 and earlier, CUPS 1.3.9 and earlier, and numerous other applications that utilize JBIG2 decoding functionality. The flaw specifically manifests in three distinct functions within the JBIG2Stream class structure, creating multiple attack vectors for malicious actors seeking to exploit the system.
The technical implementation of this vulnerability involves integer overflows occurring during the processing of JBIG2 compressed data streams, particularly within the JBIG2Stream::readSymbolDictSeg and JBIG2Stream::readGenericBitmap functions. When a maliciously crafted PDF file contains specially constructed JBIG2 data, the decoder attempts to perform arithmetic operations that exceed the maximum representable value for integer data types, leading to unpredictable behavior and system instability. This overflow condition causes the application to allocate insufficient memory or perform invalid memory operations, ultimately resulting in application crashes and complete denial of service. The vulnerability operates at the memory management layer where integer variables control buffer allocation sizes, making it particularly dangerous as it can be triggered through simple document parsing operations.
The operational impact of CVE-2009-0147 extends beyond simple service disruption to potentially enable more sophisticated attack vectors within the broader context of cyber threat landscapes. When exploited, these integer overflows can cause applications to crash repeatedly, effectively rendering PDF processing systems unavailable to legitimate users and creating significant operational downtime for organizations relying on document management systems. The vulnerability's remote exploitability means that attackers can trigger the flaw through web-based PDF viewers, email attachments, or any system that automatically processes PDF documents containing malicious JBIG2 data. This characteristic aligns with ATT&CK technique T1203, where adversaries leverage application vulnerabilities to gain access to systems through common user interactions with documents, making the attack surface particularly broad and difficult to control.
The underlying cause of this vulnerability maps directly to CWE-190, which identifies integer overflow conditions as a fundamental flaw in data processing operations. The issue demonstrates poor input validation and inadequate bounds checking within the JBIG2 decoder implementation, where integer variables controlling memory allocation do not properly validate their inputs before performing arithmetic operations. This weakness creates a pathway for attackers to manipulate the normal flow of application execution through carefully crafted input data. Organizations implementing mitigation strategies should focus on updating to patched versions of affected software, implementing strict input validation controls, and deploying network-based protections that can detect and block suspicious PDF content before it reaches vulnerable systems. The vulnerability also underscores the importance of regular security assessments and vulnerability management programs that can identify and remediate similar flaws in legacy systems that continue to process PDF documents in enterprise environments.
This vulnerability classifies under the broader category of memory corruption issues that have historically plagued document processing applications, with similar patterns observed in other PDF-related vulnerabilities. The exploitation techniques used in CVE-2009-0147 align with established patterns of denial of service attacks targeting multimedia decompression libraries, where integer overflows in image and graphics processing components create predictable crash conditions. Security professionals should recognize this as a precursor to more advanced exploitation techniques that could potentially be extended to achieve arbitrary code execution if additional vulnerabilities exist in the same codebase. The widespread deployment of affected software across enterprise networks makes this vulnerability particularly concerning from a risk management perspective, requiring immediate attention and remediation efforts to prevent exploitation by threat actors who may be actively targeting these systems.