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CVE-2020-15107

MEDIUMCVSS 5.3/10EPSS 0.33%

Last modified

CVE-2020-15107 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. In openenclave before 0.10.0, 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. EPSS estimates a 0.33% chance of exploitation in the next 30 days.

Description

In openenclave before 0.10.0, 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. This has been fixed in 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.

Metrics

CVSS 3.1
5.3/10

CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:N/I:H/A:N

EPSS Probability
0.33%

25.0th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

VendorProductVersions
OpenenclaveOpenenclave< 0.10.0

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2020-15107?
In openenclave before 0.10.0, 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. This has been fixed in 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.
How severe is CVE-2020-15107?
CVE-2020-15107 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 0.33% probability of exploitation in the next 30 days.
How do I fix CVE-2020-15107?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-15107?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST