CVE-2023-37479

Source
https://nvd.nist.gov/vuln/detail/CVE-2023-37479
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-37479.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2023-37479
Related
  • GHSA-5gfr-m6mx-p5w4
Published
2023-07-17T23:15:08Z
Modified
2025-01-15T04:56:03.208294Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N CVSS Calculator
Summary
[none]
Details

Open Enclave is a hardware-agnostic open source library for developing applications that utilize Hardware-based Trusted Execution Environments, also known as Enclaves. There are two issues that are mitigated in version 0.19.3. First, Open Enclave SDK does not properly sanitize the MXCSR register on enclave entry. This makes applications vulnerable to MXCSR Configuration Dependent Timing (MCDT) attacks, where incorrect MXCSR values can impact instruction retirement by at most one cycle, depending on the (secret) data operand value. Please find more details in the guidance from Intel in the references. Second, Open Enclave SDK does not sanitize x86's alignment check flag RFLAGS.AC on enclave entry. This opens up the possibility for a side-channel attacker to be notified for every unaligned memory access performed by the enclave. The issue has been addressed in version 0.19.3 and the current master branch. Users will need to recompile their applications against the patched libraries to be protected from this vulnerability. There are no known workarounds for this vulnerability.

References

Affected packages

Git / github.com/openenclave/openenclave

Affected ranges

Type
GIT
Repo
https://github.com/openenclave/openenclave
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
Fixed

Affected versions

v0.*

v0.12.0-rc2
v0.13.0-rc2
v0.19.0
v0.19.0-rc1
v0.19.2
v0.8.1