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[New] Nsenter to PID 1 Namespace via Auditd/D4C#5988

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Samirbous merged 13 commits into
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nsenter_runc
May 2, 2026
Merged

[New] Nsenter to PID 1 Namespace via Auditd/D4C#5988
Samirbous merged 13 commits into
mainfrom
nsenter_runc

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@Samirbous

@Samirbous Samirbous commented Apr 27, 2026 •
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we have an existing rule (compatible with Elastic Defend - uses `process.entry_leader.entry_meta.type == "container").

detection-rules/rules/linux/privilege_escalation_docker_escape_via_nsenter.toml

Line 15 in 0f521a0

index = ["logs-endpoint.events.process*"]

Two new rules compatible with the auditd and D4C integrations.

image

@Samirbous
[New] Nsenter to PID 1 Namespace via Auditd
160c695 
we have an existing rule https://github.com/elastic/detection-rules/blob/0f521a0848420844f3af383f1dee8481d41b2e5b/rules/linux/privilege_escalation_docker_escape_via_nsenter.toml#L15 (compatible only with Elastic Defend `process.entry_leader.entry_meta.type == "container"`).

This rule is compatible with the auditd integration and scoped to Init/systemd PID namespace commonly targeted for container escape.
@Samirbous Samirbous self-assigned this Apr 27, 2026
@github-actions

github-actions Bot commented Apr 27, 2026

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Rule: New - Guidelines

These guidelines serve as a reminder set of considerations when proposing a new rule.

Documentation and Context

  • Detailed description of the rule.
  • List any new fields required in ECS/data sources.
  • Link related issues or PRs.
  • Include references.

Rule Metadata Checks

  • creation_date matches the date of creation PR initially merged.
  • min_stack_version should support the widest stack versions.
  • name and description should be descriptive and not include typos.
  • query should be inclusive, not overly exclusive, considering performance for diverse environments. Non ecs fields should be added to non-ecs-schema.json if not available in an integration.
  • min_stack_comments and min_stack_version should be included if the rule is only compatible starting from a specific stack version.
  • index pattern should be neither too specific nor too vague, ensuring it accurately matches the relevant data stream (e.g., use logs-endpoint.process-* for process data).
  • integration should align with the index. If the integration is newly introduced, ensure the manifest, schemas, and new_rule.yaml template are updated.
  • setup should include the necessary steps to configure the integration.
  • note should include any additional information (e.g. Triage and analysis investigation guides, timeline templates).
  • tags should be relevant to the threat and align/added to the EXPECTED_RULE_TAGS in the definitions.py file.
  • threat, techniques, and subtechniques should map to ATT&CK always if possible.

New BBR Rules

  • building_block_type should be included if the rule is a building block and the rule should be located in the rules_building_block folder.
  • bypass_bbr_timing should be included if adding custom lookback timing to the rule.

Testing and Validation

  • Provide evidence of testing and detecting the expected threat.
  • Check for existence of coverage to prevent duplication.

@tradebot-elastic

tradebot-elastic commented Apr 27, 2026 •
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⛔️ Test failed

Results
  • ❌ Nsenter to PID 1 Namespace via Auditd (kuery)
    • coverage_issue: no_rta
    • stack_validation_failed: no_rta

@tradebot-elastic

tradebot-elastic commented Apr 27, 2026 •
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⛔️ Test failed

Results
  • ❌ Nsenter Execution with Target Flag Inside Container (eql)
    • coverage_issue: no_rta
    • stack_validation_failed: no_rta
  • ❌ Nsenter to PID 1 Namespace via Auditd (kuery)
    • coverage_issue: no_rta
    • stack_validation_failed: no_rta

@Samirbous Samirbous changed the title [New] Nsenter to PID 1 Namespace via Auditd [New] Nsenter to PID 1 Namespace via Auditd/D4C Apr 27, 2026
@Samirbous Samirbous requested a review from Aegrah April 27, 2026 16:04
@tradebot-elastic

tradebot-elastic commented Apr 27, 2026 •
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⛔️ Test failed

Results
  • ❌ Nsenter Execution with Target Flag Inside Container (eql)
    • coverage_issue: no_rta
    • stack_validation_failed: no_rta
  • ❌ Nsenter to PID 1 Namespace via Auditd (kuery)
    • coverage_issue: no_rta
    • stack_validation_failed: no_rta

@tradebot-elastic

tradebot-elastic commented Apr 27, 2026 •
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⛔️ Test failed

Results
  • ❌ Nsenter Execution with Target Flag Inside Container (eql)
    • coverage_issue: no_rta
    • stack_validation_failed: no_rta
  • ❌ Nsenter to PID 1 Namespace via Auditd (kuery)
    • coverage_issue: no_rta
    • stack_validation_failed: no_rta

terrancedejesus
terrancedejesus reviewed Apr 30, 2026
View reviewed changes
Comment thread rules/linux/privilege_escalation_auditd_nsenter_target_host_pid.toml Outdated
terrancedejesus
terrancedejesus approved these changes Apr 30, 2026
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@terrancedejesus terrancedejesus left a comment

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Looks good. Nsenter Execution with Target Flag Inside Container I think we can remove FPs for debugging tools after it ships.

Great stuff!

@tradebot-elastic

tradebot-elastic commented May 1, 2026 •
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⛔️ Test failed

Results
  • ❌ Nsenter Execution with Target Flag Inside Container (eql)
    • coverage_issue: no_rta
    • stack_validation_failed: no_rta
  • ❌ Nsenter to PID 1 Namespace via Auditd (kuery)
    • coverage_issue: no_rta
    • stack_validation_failed: no_rta

@tradebot-elastic

tradebot-elastic commented May 1, 2026 •
edited
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⛔️ Test failed

Results
  • ❌ Nsenter Execution with Target Flag Inside Container (eql)
    • coverage_issue: no_rta
    • stack_validation_failed: no_rta
  • ❌ Nsenter to PID Namespace via Auditd (kuery)
    • coverage_issue: no_rta
    • stack_validation_failed: no_rta

Mikaayenson
Mikaayenson approved these changes May 1, 2026
View reviewed changes
Comment thread rules/integrations/cloud_defend/privilege_escalation_nsenter_execution_inside_container.toml Outdated
Comment thread rules/linux/privilege_escalation_auditd_nsenter_target_host_pid.toml Outdated
@Samirbous @Mikaayenson
Update rules/linux/privilege_escalation_auditd_nsenter_target_host_pi…
d66affd 
…d.toml

Co-authored-by: Mika Ayenson, PhD <Mikaayenson@users.noreply.github.com>
@tradebot-elastic

tradebot-elastic commented May 2, 2026 •
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⛔️ Test failed

Results
  • ❌ Nsenter Execution with Target Flag Inside Container (eql)
    • coverage_issue: no_rta
    • stack_validation_failed: no_rta
  • ❌ Nsenter to PID Namespace via Auditd (kuery)
    • coverage_issue: no_rta
    • stack_validation_failed: no_rta

@tradebot-elastic

tradebot-elastic commented May 2, 2026 •
edited
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⛔️ Test failed

Results
  • ❌ Nsenter Execution with Target Flag Inside Container (eql)
    • coverage_issue: no_rta
    • stack_validation_failed: no_rta
  • ❌ Nsenter to PID Namespace via Auditd (kuery)
    • coverage_issue: no_rta
    • stack_validation_failed: no_rta

@tradebot-elastic

tradebot-elastic commented May 2, 2026 •
edited
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⛔️ Test failed

Results
  • ❌ Nsenter Execution with Target Flag Inside Container (eql)
    • coverage_issue: no_rta
    • stack_validation_failed: no_rta
  • ❌ Nsenter to PID Namespace via Auditd (kuery)
    • coverage_issue: no_rta
    • stack_validation_failed: no_rta

@tradebot-elastic

tradebot-elastic commented May 2, 2026 •
edited
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⛔️ Test failed

Results
  • ❌ Nsenter Execution with Target Flag Inside Container (eql)
    • coverage_issue: no_rta
    • stack_validation_failed: no_rta
  • ❌ Nsenter to PID Namespace via Auditd (kuery)
    • coverage_issue: no_rta
    • stack_validation_failed: no_rta

@tradebot-elastic

tradebot-elastic commented May 2, 2026 •
edited
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⛔️ Test failed

Results
  • ❌ Nsenter Execution with Target Flag Inside Container (eql)
    • coverage_issue: no_rta
    • stack_validation_failed: no_rta
  • ❌ Nsenter to PID Namespace via Auditd (kuery)
    • coverage_issue: no_rta
    • stack_validation_failed: no_rta

@tradebot-elastic

tradebot-elastic commented May 2, 2026 •
edited
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⛔️ Test failed

Results
  • ❌ Nsenter Execution with Target Flag Inside Container (eql)
    • coverage_issue: no_rta
    • stack_validation_failed: no_rta
  • ❌ Nsenter to PID Namespace via Auditd (kuery)
    • coverage_issue: no_rta
    • stack_validation_failed: no_rta

@tradebot-elastic

tradebot-elastic commented May 2, 2026 •
edited
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⛔️ Test failed

Results
  • ❌ Nsenter Execution with Target Flag Inside Container (eql)
    • coverage_issue: no_rta
    • stack_validation_failed: no_rta
  • ❌ Nsenter to PID Namespace via Auditd (kuery)
    • coverage_issue: no_rta
    • stack_validation_failed: no_rta

@Samirbous Samirbous merged commit 838e926 into main May 2, 2026
13 checks passed
@Samirbous Samirbous deleted the nsenter_runc branch May 2, 2026 13:56
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Reviewers

@Mikaayenson Mikaayenson Mikaayenson approved these changes
@terrancedejesus terrancedejesus terrancedejesus approved these changes
@Aegrah Aegrah Awaiting requested review from Aegrah
@imays11 imays11 Awaiting requested review from imays11
@eric-forte-elastic eric-forte-elastic Awaiting requested review from eric-forte-elastic

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@Samirbous Samirbous

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backport: auto Domain: Endpoint Integration: Auditd Manager OS: Linux Rule: New Proposal for new rule

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@Samirbous @tradebot-elastic @Mikaayenson @terrancedejesus