CVE-2018-25306
Buffer Overflow in PDFunite via Malformed PDF Processing
Publication date: 2026-04-29
Last updated on: 2026-05-05
Assigner: VulnCheck
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| canonical | pdfunite | 0.41.0 |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-120 | The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability exists in PDFunite version 0.41.0 and is a buffer overflow issue. It allows local attackers to crash the application by processing specially crafted malformed PDF files during merge operations. Specifically, the vulnerability triggers a segmentation fault in the XRef::getEntry function within the libpoppler library when the pdfunite utility processes these malicious PDF files.
How can this vulnerability impact me? :
The primary impact of this vulnerability is that an attacker with local access can cause the pdfunite application to crash by supplying a malformed PDF file. This results in a denial of service condition, potentially disrupting workflows that rely on PDF merging. There is no indication from the provided information that this vulnerability allows for code execution or data compromise.
How can this vulnerability be detected on my network or system? Can you suggest some commands?
This vulnerability can be detected by testing the pdfunite utility with specially crafted malformed PDF files that trigger the buffer overflow and cause a crash during merge operations.
A practical approach is to run pdfunite on suspicious or untrusted PDF files and observe if the application crashes or triggers a segmentation fault, particularly in the XRef::getEntry function.
No specific detection commands or network-based detection methods are provided.
What immediate steps should I take to mitigate this vulnerability?
Immediate mitigation steps include avoiding the use of pdfunite 0.41.0 on untrusted or malformed PDF files to prevent triggering the buffer overflow.
Since the vulnerability is local and triggered by processing crafted PDF files, restricting access to the pdfunite utility or running it with limited privileges can reduce risk.
No specific patches or updates are mentioned, so monitoring for vendor updates or patches is recommended.
Can you explain this vulnerability to me?
The vulnerability in PDFunite version 0.41.0 is a buffer overflow issue that occurs when the application processes malformed PDF files during merge operations.
Specifically, local attackers can cause the pdfunite utility to crash by providing a specially crafted PDF file that triggers a segmentation fault in the XRef::getEntry function within the libpoppler library.
This vulnerability is classified as CWE-120 (Classic Buffer Overflow) and allows attackers to cause a denial-of-service condition by crashing the application.
How can this vulnerability impact me? :
This vulnerability can impact you by allowing local attackers to crash the pdfunite application when it processes specially crafted malformed PDF files.
The crash results in a denial-of-service (DoS) condition, which means the application becomes unavailable or stops functioning properly during PDF merge operations.
While the vulnerability does not directly allow code execution or data theft, the disruption caused can affect workflows that rely on pdfunite for PDF processing.
How can this vulnerability be detected on my network or system? Can you suggest some commands?
This vulnerability can be detected by attempting to process specially crafted malformed PDF files with the pdfunite utility and observing if the application crashes or triggers a segmentation fault.
A practical detection method is to run pdfunite on suspicious or fuzzed PDF files and monitor for crashes or segmentation faults related to the XRef::getEntry function.
While no specific detection commands are provided in the resources, a basic command to test the vulnerability could be:
- pdfunite malformed.pdf benign.pdf output.pdf
If pdfunite crashes or segfaults during this operation, it indicates the presence of the vulnerability.
What immediate steps should I take to mitigate this vulnerability?
Immediate mitigation steps include avoiding the use of pdfunite to merge untrusted or malformed PDF files, as the vulnerability is triggered by processing such files.
Applying security updates or patches to the poppler and pdfunite packages that address this buffer overflow vulnerability is recommended once available.
Since the vulnerability allows local attackers to crash the application, restricting local access to the pdfunite utility can reduce risk.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
The provided context and resources do not contain information regarding the impact of this vulnerability on compliance with common standards and regulations such as GDPR or HIPAA.