Inconsistent Execute-Never Bits in ARM Trusted Firmware 1.3 Allows Bypass of MT_EXECUTE_NEVER Protection

CVE-2017-7563 · MEDIUM Severity

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

In ARM Trusted Firmware 1.3, RO memory is always executable at AArch64 Secure EL1, allowing attackers to bypass the MT_EXECUTE_NEVER protection mechanism. This issue occurs because of inconsistency in the number of execute-never bits (one bit versus two bits).

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