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CWE-1342: Information Exposure through Microarchitectural… | Glexia

CWE-1342 (Information Exposure through Microarchitectural State after Transient Execution) weakness overview with consequences, detection methods, mitigations,…

Release 4.20weaknessIncomplete
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Glexia's Take · Automated analysis

CWE-1342: Information Exposure through Microarchitectural State after Transient Execution

Information Exposure through Microarchitectural State after Transient Execution represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

Executive Impact

  • Confidentiality,Integrity: Modify Memory,Read Memory,Execute Unauthorized Code or Commands

Developer Pattern

CWE-1342 is the kind of defect developers can usually prevent with explicit validation, safer framework defaults, and tests that exercise hostile input or unsafe state transitions.

Automation confidence

high confidence from CWE-1342, 4.20.

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Official CWE Definition

CWE-1342: Information Exposure through Microarchitectural State after Transient Execution

The processor does not properly clear microarchitectural state after incorrect microcode assists or speculative execution, resulting in transient execution.

Type
weakness
Abstraction
Base
Status
Incomplete
Source
MITRE CWE definition

Developer And Remediation Guidance

How teams prevent and detect this weakness

Causes

  • Faulting loads in a victim domain may trigger incorrect transient forwarding, which leaves secret-dependent traces in the microarchitectural state. Consider this example from [REF-1203]. Consider the code gadget:,

Remediation

  • Architecture and Design,Requirements: Hardware ensures that no illegal data flows from faulting micro-ops exists at the microarchitectural level.
  • Build and Compilation: Include instructions that explicitly remove traces of unneeded computations from software interactions with microarchitectural elements e.g. lfence, sfence, mfence, clflush.

Detection

  • Code review
  • SAST
  • DAST
  • Focused regression tests

Mappings

Related CVEs, CWEs, and ATT&CK context

Related CWEs

Related CVEs

Related CVE mappings appear after CVE records are cross-indexed.

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ATT&CK Relevance

ATT&CK relevance is shown only when reviewed or responsibly inferred.