The build_filter_chain function in pdf/pdf-stream.c in Artifex MuPDF before 2017-09-25 mishandles a certain case where a variable may reside in a register, which allows remote attackers to cause a denial of service (Fitz fz_drop_imp use-after-free and application crash) or possibly have unspecified other impact via a crafted PDF document.
The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory “belongs” to the code that operates on the new pointer.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Mupdf | Artifex | * | 1.11 (including) |
| Mupdf | Ubuntu | artful | * |
| Mupdf | Ubuntu | esm-apps/xenial | * |
| Mupdf | Ubuntu | trusty | * |
| Mupdf | Ubuntu | upstream | * |
| Mupdf | Ubuntu | xenial | * |
| Mupdf | Ubuntu | zesty | * |