CVE-2021-44421
MEDIUMCVSS 5.5/10EPSS 0.43%
Last modified
CVE-2021-44421 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. 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.. EPSS estimates a 0.43% chance of exploitation in the next 30 days.
Description
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.
Metrics
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Occlum Project | Occlum | < 0.26.0 |
References
- https://github.com/occlum/occlum/blob/821ea843ae21037e6cff5268306d2da1fb131552/src/libos/src/util/mem_util.rs#L130Exploit, Third Party Advisory
- https://github.com/occlum/occlum/blob/821ea843ae21037e6cff5268306d2da1fb131552/src/libos/src/util/mem_util.rs#L51Exploit, Third Party Advisory
- https://github.com/occlum/occlum/commit/36918e42bf6732c4d3996bc99eb013eb6b90b249Patch, Third Party Advisory
- https://github.com/occlum/occlum/compare/0.25.0...v0.26.0Third Party Advisory
- https://github.com/occlum/occlum/blob/821ea843ae21037e6cff5268306d2da1fb131552/src/libos/src/util/mem_util.rs#L130Exploit, Third Party Advisory
- https://github.com/occlum/occlum/blob/821ea843ae21037e6cff5268306d2da1fb131552/src/libos/src/util/mem_util.rs#L51Exploit, Third Party Advisory
- https://github.com/occlum/occlum/commit/36918e42bf6732c4d3996bc99eb013eb6b90b249Patch, Third Party Advisory
- https://github.com/occlum/occlum/compare/0.25.0...v0.26.0Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-44421?
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.
How severe is CVE-2021-44421?
CVE-2021-44421 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 0.43% probability of exploitation in the next 30 days.
How do I fix CVE-2021-44421?
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-2021-44421?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST