The resolveImplicitLevels function in common/ubidi.c in the Unicode Bidirectional Algorithm implementation in ICU4C in International Components for Unicode (ICU) before 55.1 uses an integer data type that is inconsistent with a header file, which allows remote attackers to cause a denial of service (incorrect malloc followed by invalid free) or possibly execute arbitrary code via crafted text.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Mac_os_x | Apple | * | 10.10.4 (including) |
| Watchos | Apple | * | 1.0.1 (including) |
| Icu | Ubuntu | devel | * |
| Icu | Ubuntu | trusty | * |
| Icu | Ubuntu | upstream | * |
| Icu | Ubuntu | utopic | * |
| Icu | Ubuntu | vivid | * |