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Core I3 CVE-2018-3620

MEDIUM
Observable Discrepancy (CWE-203)
2018-08-14 secure@intel.com
Authentication Bypass Intel Core I3 Core I5 Core I7 Core M Core M3 Core M5 Core M7 Xeon
5.6
CVSS 3.1 · NVD
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Vulnerability Assessment

Weakness
CWE
CWE-203
ASVS 5.0
V6 - Authentication Timing-safe comparisons
Impact

CVSS score of 5.6 (MEDIUM). Attack characteristics: local attack vector, high complexity, low privileges required, no user interaction not required. EPSS exploitation probability: 2.26%.
Exploit ScenarioDerived

Successful exploitation could compromise the medium-severity affected system.
This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
No patch listed yet 2.3% exploitation probability (EPSS)

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AnalysisAI

Systems with microprocessors utilizing speculative execution and address translations may allow unauthorized disclosure of information residing in the L1 data cache to an attacker with local user. Rated medium severity (CVSS 5.6). No vendor patch available.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

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Technical ContextAI · show details

This vulnerability is classified under CWE-203. Systems with microprocessors utilizing speculative execution and address translations may allow unauthorized disclosure of information residing in the L1 data cache to an attacker with local user access via a terminal page fault and a side-channel analysis. Affected products include: Intel Core I3, Intel Core I5, Intel Core I7, Intel Core M, Intel Core M3.

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  • Exploit and PoC references, threat intelligence from 22 sources
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Severity by source

NVD PRIMARY 5.6 MEDIUM
AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector
Local
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
None
Availability
None

DescriptionCVE.org

Systems with microprocessors utilizing speculative execution and address translations may allow unauthorized disclosure of information residing in the L1 data cache to an attacker with local user access via a terminal page fault and a side-channel analysis.

Threat Intelligence Overview

EPSS Score
2.3%
Top 15% exploitable
Data Quality
4 sources
Confidence: Medium
NVD CVE.org EPSS VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity MEDIUM
CISA KEV No
Public POC No
EPSS 2.3%
Patch available No
Active threat No
Deciding rule
MEDIUM severity (CVSS 4.0-6.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Defer
Exploitation· derived
None
System Exposure· derived
Small
Automatable· derived
No
Human Impact· derived
Medium

Priority Score

30
Low Medium High Critical
KEV: 0
EPSS: +2
CVSS: +28
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Authentication Bypass CRITICAL

Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.

Affected Products (CPE)CVE.org

cpe:2.3:h:intel:core_i3:330e:*:*:*:*:*:*:*
cpe:2.3:h:intel:core_i3:330m:*:*:*:*:*:*:*
cpe:2.3:h:intel:core_i3:330um:*:*:*:*:*:*:*
cpe:2.3:h:intel:core_i3:350m:*:*:*:*:*:*:*
cpe:2.3:h:intel:core_i3:370m:*:*:*:*:*:*:*
cpe:2.3:h:intel:core_i3:380m:*:*:*:*:*:*:*
cpe:2.3:h:intel:core_i3:380um:*:*:*:*:*:*:*
cpe:2.3:h:intel:core_i3:390m:*:*:*:*:*:*:*
cpe:2.3:h:intel:core_i3:530:*:*:*:*:*:*:*
cpe:2.3:h:intel:core_i3:540:*:*:*:*:*:*:*
cpe:2.3:h:intel:core_i3:550:*:*:*:*:*:*:*
cpe:2.3:h:intel:core_i3:560:*:*:*:*:*:*:*
cpe:2.3:h:intel:core_i3:2100:*:*:*:*:*:*:*
cpe:2.3:h:intel:core_i3:2100t:*:*:*:*:*:*:*
cpe:2.3:h:intel:core_i3:2102:*:*:*:*:*:*:*
cpe:2.3:h:intel:core_i3:2105:*:*:*:*:*:*:*
cpe:2.3:h:intel:core_i3:2115c:*:*:*:*:*:*:*
cpe:2.3:h:intel:core_i3:2120:*:*:*:*:*:*:*
cpe:2.3:h:intel:core_i3:2120t:*:*:*:*:*:*:*
cpe:2.3:h:intel:core_i3:2125:*:*:*:*:*:*:*
+ 443 more

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References

Advisories & patches
ADVISORY https://software.intel.com/security-software-guidance/software-guidance/l1-terminal-fault ADVISORY https://vuldb.com/vuln/122909 ADVISORY https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00161.html REF http://support.lenovo.com/us/en/solutions/LEN-24163 REF http://www.huawei.com/en/psirt/security-advisories/huawei-sa-20180815-01-cpu-en REF http://www.securityfocus.com/bid/105080 REF http://www.securitytracker.com/id/1041451 REF http://www.vmware.com/security/advisories/VMSA-2018-0021.html REF http://xenbits.xen.org/xsa/advisory-273.html REF https://access.redhat.com/errata/RHSA-2018:2384 REF https://access.redhat.com/errata/RHSA-2018:2387 REF https://access.redhat.com/errata/RHSA-2018:2388 REF https://access.redhat.com/errata/RHSA-2018:2389 REF https://access.redhat.com/errata/RHSA-2018:2390 REF https://access.redhat.com/errata/RHSA-2018:2391 REF https://access.redhat.com/errata/RHSA-2018:2392 REF https://access.redhat.com/errata/RHSA-2018:2393 REF https://access.redhat.com/errata/RHSA-2018:2394 REF https://access.redhat.com/errata/RHSA-2018:2395 REF https://access.redhat.com/errata/RHSA-2018:2396 REF https://access.redhat.com/errata/RHSA-2018:2402 REF https://access.redhat.com/errata/RHSA-2018:2403 REF https://access.redhat.com/errata/RHSA-2018:2404 REF https://access.redhat.com/errata/RHSA-2018:2602 REF https://access.redhat.com/errata/RHSA-2018:2603 REF https://cert-portal.siemens.com/productcert/pdf/ssa-254686.pdf REF https://cert-portal.siemens.com/productcert/pdf/ssa-608355.pdf REF https://foreshadowattack.eu/ REF https://help.ecostruxureit.com/display/public/UADCE725/Security+fixes+in+StruxureWare+Data+Center+Expert+v7.6.0 REF https://lists.debian.org/debian-lts-announce/2018/08/msg00029.html REF https://lists.debian.org/debian-lts-announce/2018/09/msg00017.html REF https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/V4UWGORQWCENCIF2BHWUEF2ODBV75QS2/ REF https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XRFKQWYV2H4BV75CUNGCGE5TNVQCLBGZ/ REF https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/ADV180018 REF https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2018-0009 REF https://security.FreeBSD.org/advisories/FreeBSD-SA-18:09.l1tf.asc REF https://security.gentoo.org/glsa/201810-06 REF https://security.netapp.com/advisory/ntap-20180815-0001/ REF https://support.f5.com/csp/article/K95275140 REF https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03874en_us REF https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180814-cpusidechannel REF https://usn.ubuntu.com/3740-1/ REF https://usn.ubuntu.com/3740-2/ REF https://usn.ubuntu.com/3741-1/ REF https://usn.ubuntu.com/3741-2/ REF https://usn.ubuntu.com/3742-1/ REF https://usn.ubuntu.com/3742-2/ REF https://usn.ubuntu.com/3823-1/ REF https://www.debian.org/security/2018/dsa-4274 REF https://www.debian.org/security/2018/dsa-4279 REF https://www.kb.cert.org/vuls/id/982149 REF https://www.oracle.com/security-alerts/cpujul2020.html REF https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html REF https://www.synology.com/support/security/Synology_SA_18_45

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