A use after free was found in igc_reloc_struct_ptr() of psi/igc.c of ghostscript-9.25. A local attacker could supply a specially crafted PDF file to cause a denial of service.
Weakness
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 Any operations using the original pointer are no longer valid because the memory “belongs” to the code that operates on the new pointer.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Ghostscript | Artifex | 9.25 (including) | 9.25 (including) |
| Red Hat Enterprise Linux 8 | RedHat | ghostscript-0:9.27-1.el8 | * |
| Ghostscript | Ubuntu | trusty | * |
| Ghostscript | Ubuntu | upstream | * |
Potential Mitigations
References
- https://bugs.ghostscript.com/show_bug.cgi?id=702851
- https://bugzilla.redhat.com/show_bug.cgi?id=1873239
- https://git.ghostscript.com/?p=ghostpdl.git%3Ba=commitdiff%3Bh=ece5cbbd9979cd35737b00e68267762d72feb2ea%3Bhp=1ef5f08f2c2e27efa978f0010669ff22355c385f
- https://bugs.ghostscript.com/show_bug.cgi?id=702851
- https://bugzilla.redhat.com/show_bug.cgi?id=1873239
- https://git.ghostscript.com/?p=ghostpdl.git%3Ba=commitdiff%3Bh=ece5cbbd9979cd35737b00e68267762d72feb2ea%3Bhp=1ef5f08f2c2e27efa978f0010669ff22355c385f