Remote Crash Vulnerability in Sandstorm Cap'n Proto (Versions before 0.5.3.1) due to Compiler Optimization

CVE-2017-7892 · MEDIUM Severity

AV:N/AC:L/AU:N/C:N/I:N/A:P

Sandstorm Cap'n Proto before 0.5.3.1 allows remote crashes related to a compiler optimization. A remote attacker can trigger a segfault in a 32-bit libcapnp application because Cap'n Proto relies on pointer arithmetic calculations that overflow. An example compiler with optimization that elides a bounds check in such calculations is Apple LLVM version 8.1.0 (clang-802.0.41). The attack vector is a crafted far pointer within a message.

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