Description
Clang in LLVM, as used in Apple Xcode before 6.3, performs incorrect register allocation in a way that triggers stack storage for stack cookie pointers, which might allow context-dependent attackers to bypass a stack-guard protection mechanism via crafted input to an affected C program.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | llvm-toolchain-3.5 +1 | No fix yet | — |
| Ubuntu 14.04 LTS | llvm-toolchain-3.6 | No fix yet | — |
References
- https://support.apple.com/HT204663
- 1032081 vdb-entry
- 73987 vdb-entry
- APPLE-SA-2015-04-08-5 vendor-advisory