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x87 FPU operations in enclaves are vulnerable to ABI poisoning

Low
CodeMonkeyLeet published GHSA-7wjx-wcwg-w999 Jul 13, 2020

Package

No package listed

Affected versions

<0.10.0

Patched versions

0.10.0

Description

Impact

Enclaves that use x87 FPU operations are vulnerable to tampering by a malicious host application. By violating the Linux System V Application Binary Interface (ABI) for such operations, a host app can compromise the execution integrity of some x87 FPU operations in an enclave. Depending on the FPU control configuration of the enclave app and whether the operations are used in secret-dependent execution paths, this vulnerability may also be used to mount a side-channel attack on the enclave.

Patches

The issue has been addressed in version 0.10.0 and the current master branch. Users will need to recompile their applications against the patched libraries to be protected from this vulnerability.

Workarounds

No workarounds have been identified for this vulnerability.

Acknowledgements

Jo Van Bulck (imec-DistriNet, KU Leuven)
Fritz Alder (imec-DistriNet, KU Leuven)
David Oswald (The University of Birmingham, UK)
Frank Piessens (imec-DistriNet, KU Leuven)

For more information

If you have any questions or comments about this advisory:

Severity

Low

CVE ID

CVE-2020-15107

Weaknesses

No CWEs