CVE-2018-17338 in pdfalto
Summary
by MITRE
An issue has been found in pdfalto through 0.2. It is a heap-based buffer overflow in the function TextPage::dump in XmlAltoOutputDev.cc.
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Analysis
by VulDB Data Team • 05/17/2023
The vulnerability identified as CVE-2018-17338 represents a critical heap-based buffer overflow affecting the pdfalto software version 0.2 and earlier. This flaw exists within the TextPage::dump function located in the XmlAltoOutputDev.cc source file, making it a significant security concern for systems that process or convert pdf documents through this software component. The issue arises from inadequate bounds checking during memory allocation and data handling operations, creating an exploitable condition that could allow malicious actors to manipulate program execution flow.
The technical nature of this vulnerability places it within the scope of CWE-121, which describes heap-based buffer overflow conditions where insufficient bounds checking allows attackers to write beyond allocated memory regions. This particular flaw demonstrates how improper memory management in document processing software can create opportunities for arbitrary code execution. When pdfalto processes malformed pdf files containing specially crafted data structures, the TextPage::dump function fails to validate input boundaries, leading to memory corruption that can be leveraged for privilege escalation or system compromise.
From an operational perspective, this vulnerability poses substantial risk to organizations relying on pdfalto for document conversion and processing workflows. Attackers could exploit this flaw by submitting malicious pdf files that trigger the buffer overflow during text extraction operations, potentially leading to complete system compromise or denial of service conditions. The impact extends beyond individual system vulnerabilities as it affects the broader pdf processing ecosystem where such tools are commonly integrated into document management systems, content management platforms, and automated workflows.
Security practitioners should implement immediate mitigations including updating to pdfalto version 0.3 or later where this vulnerability has been patched, implementing input validation and sanitization measures for all pdf processing pipelines, and deploying runtime protections such as address space layout randomization and stack canaries. Additionally, organizations should consider network segmentation and access controls to limit exposure of systems running vulnerable versions of pdfalto, while monitoring for suspicious file processing activities that might indicate exploitation attempts. The vulnerability aligns with ATT&CK technique T1059.007 for command and script interpreter execution through potentially compromised document processing systems.