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CVE-2021-44421

Date: March 6, 2022

The pointer-validation logic in util/mem_util.rs in Occlum before 0.26.0 for Intel SGX acts as a confused deputy that allows a local attacker to access unauthorized information via side-channel analysis.

Language: Ruby

Severity Score

Related Resources (6)

https://github.com/occlum/occlum/compare/0.25.0...v0.26.0
https://nvd.nist.gov/vuln/detail/CVE-2021-44421
https://github.com/occlum/occlum/blob/821ea843ae21037e6cff5268306d2da1fb131552/src/libos/src/util/mem_util.rs#L51
https://github.com/occlum/occlum/blob/821ea843ae21037e6cff5268306d2da1fb131552/src/libos/src/util/mem_util.rs#L130
https://github.com/occlum/occlum/commit/36918e42bf6732c4d3996bc99eb013eb6b90b249
https://www.mend.io/vulnerability-database/CVE-2021-44421

Severity Score

Weakness Type (CWE)

Observable Discrepancy

CWE-203

CVSS v3.1

Base Score:
Attack Vector (AV): LOCAL
Attack Complexity (AC): LOW
Privileges Required (PR): LOW
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): NONE
Availability (A): NONE

CVSS v2

Base Score:
Access Vector (AV): LOCAL
Access Complexity (AC): LOW
Authentication (AU): NONE
Confidentiality (C): PARTIAL
Integrity (I): NONE
Availability (A): NONE
Additional information:

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