CVE-2023-37479

Summary

CVE-2023-37479 affects Open Enclave, an open-source library for creating applications using Trusted Execution Environments. The vulnerability involves two issues: first, the library does not properly sanitize the `MXCSR` register on enclave entry, making applications susceptible to MXCSR Configuration Dependent Timing (MCDT) attacks, where an attacker can manipulate instruction retirement based on secret data operand values. Second, Open Enclave SDK fails to sanitize the x86 alignment check flag `RFLAGS.AC` on enclave entry, paving the way for side-channel attacks based on unaligned memory accesses. Both issues have been addressed in version 0.19.3, and users must recompile their applications using the patched libraries to mitigate the risks. No known workarounds exist for this vulnerability.

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