PT-2022-12117 · Intel · Occlum

David Oswald + 5 · Published 2022-03-06 · Updated 2022-03-15 · CVE-2021-44421

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Name of the Vulnerable Software and Affected Versions Occlum versions prior to 0.26.0

Description The issue concerns the pointer-validation logic in Occlum for Intel SGX, which can act as a confused deputy. This allows a local attacker to access unauthorized information via side-channel analysis.

Recommendations For versions prior to 0.26.0, update to version 0.26.0 or later to resolve the issue. As a temporary workaround, consider restricting access to sensitive information to minimize the risk of exploitation via side-channel analysis.

Exploit

Fix

Side Channel Attack

Weakness Enumeration

CWE-203

Related Identifiers

CVE-2021-44421

Affected Products

Occlum

References · 7

• 🔥 https://github.com/occlum/occlum/blob/821ea843ae21037e6cff5268306d2da1fb131552/src/libos/src/util/mem_util.rs#L130 · Exploit
• 🔥 https://github.com/occlum/occlum/blob/821ea843ae21037e6cff5268306d2da1fb131552/src/libos/src/util/mem_util.rs#L51 · Exploit
• https://github.com/occlum/occlum/commit/36918e42bf6732c4d3996bc99eb013eb6b90b249 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2021-44421 · Security Note
• https://osv.dev/vulnerability/CVE-2021-44421 · Vendor Advisory
• https://github.com/occlum/occlum/compare/0.25.0...v0.26.0 · Note
• https://t.me/cibsecurity/38656 · Telegram Post