Information disclosure via unchecked enclave pointer use
Published Dec 30, 2023 · Updated Sep 9, 2024
Information disclosure in Fortanix EnclaveOS CCM before 3.29 allows local users to infer protected Intel SGX enclave data. The runtime calls strlen on an untrusted pointer before validating its range, creating a side-channel oracle for null-byte positions, while undefined void-pointer arithmetic removes intended overflow checks in sgx_is_within_user. Exploitation requires local control of host-side enclave inputs and can reveal enclave-memory structure, including secret-dependent zero-byte positions, without modifying data.
Summary
What happened
Information disclosure in Fortanix EnclaveOS CCM before 3.29 allows local users to infer protected Intel SGX enclave data. The runtime calls strlen on an untrusted pointer before validating its range, creating a side-channel oracle for null-byte positions, while undefined void-pointer arithmetic removes intended overflow checks in sgx_is_within_user. Exploitation requires local control of host-side enclave inputs and can reveal enclave-memory structure, including secret-dependent zero-byte positions, without modifying data.
The record
- CVE
- CVE-2023-38022
- Published
- Dec 30, 2023
- Updated
- Sep 9, 2024
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- T1005
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Dec 30, 2023CVE publishedPublication date reported by the CVE source.
- Sep 9, 2024Record updatedLatest update available in the CVE record.
Exploitability
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Published CVSS scores
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Attacks
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Technologies
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