The TIFFWriteDirectorySec() function in tif_dirwrite.c in LibTIFF through 4.0.9 allows remote attackers to cause a denial of service (assertion failure and application crash) via a crafted file, a different vulnerability than CVE-2017-13726.
The product contains an assert() or similar statement that can be triggered by an attacker, which leads to an application exit or other behavior that is more severe than necessary.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Libtiff | Libtiff | * | 4.0.9 (including) |
| Red Hat Enterprise Linux 7 | RedHat | libtiff-0:4.0.3-32.el7 | * |
| Tiff | Ubuntu | artful | * |
| Tiff | Ubuntu | bionic | * |
| Tiff | Ubuntu | precise/esm | * |
| Tiff | Ubuntu | trusty | * |
| Tiff | Ubuntu | upstream | * |
| Tiff | Ubuntu | xenial | * |
While assertion is good for catching logic errors and reducing the chances of reaching more serious vulnerability conditions, it can still lead to a denial of service. For example, if a server handles multiple simultaneous connections, and an assert() occurs in one single connection that causes all other connections to be dropped, this is a reachable assertion that leads to a denial of service.