An issue was discovered in Exempi before 2.4.3. It allows remote attackers to cause a denial of service (invalid memcpy with resultant use-after-free) or possibly have unspecified other impact via a .pdf file containing JPEG data, related to XMPFiles/source/FormatSupport/ReconcileTIFF.cpp, XMPFiles/source/FormatSupport/TIFF_MemoryReader.cpp, and XMPFiles/source/FormatSupport/TIFF_Support.hpp.
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 Any operations using the original pointer are no longer valid because the memory “belongs” to the code that operates on the new pointer.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 |
|---|---|---|---|
| Exempi | Exempi_project | * | 2.4.3 (excluding) |
| Red Hat Enterprise Linux 7 | RedHat | exempi-0:2.2.0-9.el7 | * |
| Exempi | Ubuntu | esm-infra/xenial | * |
| Exempi | Ubuntu | trusty | * |
| Exempi | Ubuntu | upstream | * |
| Exempi | Ubuntu | xenial | * |
Potential Mitigations
References
- https://access.redhat.com/errata/RHSA-2019:2048
- https://bugs.freedesktop.org/show_bug.cgi?id=100397
- https://cgit.freedesktop.org/exempi/commit/?id=c26d5beb60a5a85f76259f50ed3e08c8169b0a0c
- https://lists.debian.org/debian-lts-announce/2018/03/msg00013.html
- https://usn.ubuntu.com/3668-1/
- https://access.redhat.com/errata/RHSA-2019:2048
- https://bugs.freedesktop.org/show_bug.cgi?id=100397
- https://cgit.freedesktop.org/exempi/commit/?id=c26d5beb60a5a85f76259f50ed3e08c8169b0a0c
- https://lists.debian.org/debian-lts-announce/2018/03/msg00013.html
- https://usn.ubuntu.com/3668-1/