Vulnerability Description
The Portable Document Format (PDF) specification does not provide any information regarding the concrete procedure of how to validate signatures. Consequently, an Incremental Saving vulnerability exists in multiple products. When an attacker uses the Incremental Saving feature to add pages or annotations, Body Updates are displayed to the user without any action by the signature-validation logic. This affects Foxit Reader before 9.4 and PhantomPDF before 8.3.9 and 9.x before 9.4. It also affects LibreOffice, Master PDF Editor, Nitro Pro, Nitro Reader, Nuance Power PDF Standard, PDF Editor 6 Pro, PDFelement6 Pro, PDF Studio Viewer 2018, PDF Studio Pro, Perfect PDF 10 Premium, and Perfect PDF Reader.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Code-Industry | Master Pdf Editor | 5.1.12 |
| Foxitsoftware | Foxit Reader | 9.4 |
| Foxitsoftware | Phantompdf | >= 9.0, < 9.4 |
| Gonitro | Nitro Pro | 11.0.3.173 |
| Gonitro | Nitro Reader | 5.5.9.2 |
| Iskysoft | Pdf Editor 6 | 6.4.2.3521 |
| Iskysoft | Pdfelement6 | 6.8.0.3523 |
| Libreoffice | Libreoffice | 6.0.6.2 |
| Nuance | Power Pdf Standard | 3.0.0.17 |
| Qoppa | Pdf Studio | 12.0.7 |
| Qoppa | Pdf Studio Viewer 2018 | 2018.0.1 |
| Soft-Xpansion | Perfect Pdf 10 | 10.0.0.1 |
| Soft-Xpansion | Perfect Pdf Reader | 13.0.3 |
| Microsoft | Windows | - |
| Linux | Linux Kernel | - |
| Apple | Macos | - |
Related Weaknesses (CWE)
References
- https://pdf-insecurity.org/signature/evaluation_2018.htmlThird Party Advisory
- https://pdf-insecurity.org/signature/signature.htmlThird Party Advisory
- https://www.foxitsoftware.com/support/security-bulletins.phpVendor Advisory
- https://www.pdfa.org/recently-identified-pdf-digital-signature-vulnerabilities/Third Party Advisory
- https://pdf-insecurity.org/signature/evaluation_2018.htmlThird Party Advisory
- https://pdf-insecurity.org/signature/signature.htmlThird Party Advisory
- https://www.foxitsoftware.com/support/security-bulletins.phpVendor Advisory
- https://www.pdfa.org/recently-identified-pdf-digital-signature-vulnerabilities/Third Party Advisory
FAQ
What is CVE-2018-18688?
CVE-2018-18688 is a vulnerability with a CVSS score of 5.3 (MEDIUM). The Portable Document Format (PDF) specification does not provide any information regarding the concrete procedure of how to validate signatures. Consequently, an Incremental Saving vulnerability exis...
How severe is CVE-2018-18688?
CVE-2018-18688 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2018-18688?
Check the references section above for vendor advisories and patch information. Affected products include: Code-Industry Master Pdf Editor, Foxitsoftware Foxit Reader, Foxitsoftware Phantompdf, Gonitro Nitro Pro, Gonitro Nitro Reader.