Exploitation Attempt Of CVE-2023-46214 Using Public POC Code

Status: test
Severity: high
Log source: category webserver
Author: Lars B. P. Frydenskov(Trifork Security)
Source: github.com/SigmaHQ/sigma

Detects exploitation attempt of CVE-2023-46214, a remote code execution (RCE) in Splunk Enterprise through insecure XML parsing using known public proof of concept code

MITRE ATT&CK coverage

Tactic	Techniques
Lateral Movement	`T1210` Exploitation of Remote Services

Rule body yaml

title: Exploitation Attempt Of CVE-2023-46214 Using Public POC Code
id: ba5268de-4dd4-4d5c-8a90-2b5e6dc1aff8
related:
    - id: 04017cd5-621e-4ec4-a762-1f042fe3d3e5
      type: derived
status: test
description: |
    Detects exploitation attempt of CVE-2023-46214, a remote code execution (RCE) in Splunk Enterprise through insecure XML parsing using known public proof of concept code
references:
    - https://github.com/nathan31337/Splunk-RCE-poc/
    - https://blog.hrncirik.net/cve-2023-46214-analysis
    - https://advisory.splunk.com/advisories/SVD-2023-1104
author: Lars B. P. Frydenskov(Trifork Security)
date: 2023-11-27
tags:
    - attack.lateral-movement
    - attack.t1210
    - cve.2023-46214
    - detection.emerging-threats
logsource:
    category: webserver
detection:
    selection_method_and_response:
        cs-method: POST
        sc-status:
            - 200
            - 302
    selection_uri_upload:
        cs-uri-stem|contains: '/splunkd/__upload/indexing/preview'
        cs-uri-query|contains|all:
            - 'NO_BINARY_CHECK=1'
            - 'input.path=shell.xsl'
    selection_uri_search:
        cs-uri-stem|contains|all:
            - '/api/search/jobs'
            - '/results'
        cs-uri-query|contains|all:
            - '/opt/splunk/var/run/splunk/dispatch/'
            - '/shell.xsl'
    condition: selection_method_and_response and 1 of selection_uri_*
falsepositives:
    - Unlikely
level: high

Stages and Predicates

Stage 0: `condition`

selection_method_and_response and 1 of selection_uri_*

Stage 1: `selection_method_and_response`

selection_method_and_response:
    cs-method: POST
    sc-status:
        - 200
        - 302

Stage 2: `selection_uri_upload`

selection_uri_upload:
    cs-uri-stem|contains: '/splunkd/__upload/indexing/preview'
    cs-uri-query|contains|all:
        - 'NO_BINARY_CHECK=1'
        - 'input.path=shell.xsl'

Stage 3: `selection_uri_search`

selection_uri_search:
    cs-uri-stem|contains|all:
        - '/api/search/jobs'
        - '/results'
    cs-uri-query|contains|all:
        - '/opt/splunk/var/run/splunk/dispatch/'
        - '/shell.xsl'

Indicators

Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.

Field	Kind	Values
`cs-method`	eq	`POST`
`cs-uri-query`	match	`/opt/splunk/var/run/splunk/dispatch/` `/shell.xsl` `NO_BINARY_CHECK=1` `input.path=shell.xsl`
`cs-uri-stem`	match	`/api/search/jobs` `/results` `/splunkd/__upload/indexing/preview`
`sc-status`	eq	`200` `302`

`j` / `k`	Scroll down / up
`d` / `u`	Half-page down / up
`gg` / `G`	Top / bottom
`h` / `l`	History back / forward
`f`	Follow link (`Shift` = new tab)
`/`	Focus search
`?`	Toggle this help
`↑` / `↓`	Navigate search results
`Enter`	Open highlighted result
`Esc`	Close results / dialog

`type:`	`events` / `rules` / `providers`
`vendor:`	`sigma` / `elastic` / `splunk` / `kusto` / `chronicle` (vendor name alone also works: `sigma:`, `kql:`, `secops:`…)
`tactic:`	TA-id, slug, or name: `credential_access`, `TA0006`
`technique:`	technique or sub-technique ID: `T1003`, `T1003.001` (alias `tech:`)
`severity:`	`critical` / `high` / `medium` / `low` / `informational` (alias `sev:`)
`risk_score`	Numeric comparison on the Elastic risk score (0 to 100): `risk_score>50`, `risk_score<=20`, `risk_score=99` (alias `risk`; Elastic rules only)
`stages:`	Rules with exactly N pipeline stages
`correlation:`	`single_event` / `sequence` / `alternatives` / `alternatives_cross_log` / `all_required` / `correlated`
`with:`	Co-occurrence event-id; stacks (`with:4624 with:4769`) to require all, while a comma list in one occurrence (`with:4624,4769`) is an either-or group. Implies multi-event
`like:`	Structural neighbors of a rule slug (equivalents + subsumption stricter / broader): `like:comsvcs_lsass_memory_dump-splunk-sysmon`
`groupby:`	Entity-grouping substring match against `group_by_keys`: `groupby:user`, `groupby:host`
`uses:`	Rules whose predicate tree touches the field (any kind, any value): `uses:CommandLine`
`excludes:`	Rules with top-level `not()` clauses on the field (FP whitelists): `excludes:ParentImage`
`field:` / `value:`	Predicate search; narrows rule cards to those with a matching leaf and drives the indicator tier. Unquoted = substring, wildcards allowed (`value:mimikatz`)
`indicator:`	Shorthand for `field:F value:V`: `indicator:Image=*\powershell.exe`
`kind:`	Filter by predicate kind. Narrows rule cards to those carrying a matching predicate leaf (`vendor:elastic kind:cidr_match`) and drives the indicator tier: `contains` / `starts_with` / `ends_with` / `regex` / `cidr` / `eq` / `in` … (operator aliases `op:`/`match:`)
`has:` / `no:`	`sample`, `field`, `notes`, `refs`, `trace`, `thirdparty`, `rule`, `pattern`, `timewindow`, `threshold`, `newterms`, `sigma`/`elastic`/`splunk`/`kusto`/`chronicle`
`-op:val`	Exclude matches; works on most operators but not `type:`/`like:`/`has:`/`no:` (use `no:<flag>` to exclude a rule flag): `tactic:execution -vendor:splunk`. Standalone `-kind:`/`-field:`/`-value:` drop every rule carrying a matching predicate leaf (`type:rules -kind:is_null`)
`field:"…"` / `value:"…"`	Quoted value = anchored exact match (also allows spaces): `value:"net user"`
`a,b`	Comma = OR inside one operator (`vendor:sigma,elastic`, `severity:high,critical`); repeating a facet merges the same way. `field:`/`value:` never split (literal commas)
`vendors:` / `stage:`	Singular and plural spellings fold to the canonical operator and value: `tactics:` = `tactic:`, `type:event` = `type:events`, `correlation:sequences` = `correlation:sequence`, `has:thresholds` = `has:threshold`
`"quoted phrase"`	Exact-match a multi-word phrase (free text)

Exploitation Attempt Of CVE-2023-46214 Using Public POC Code

MITRE ATT&CK coverage

Rule body yaml

Stages and Predicates

Stage 0: `condition`

Stage 1: `selection_method_and_response`

Stage 2: `selection_uri_upload`

Stage 3: `selection_uri_search`

Indicators

Keyboard shortcuts

Search operators

Exploitation Attempt Of CVE-2023-46214 Using Public POC Code

MITRE ATT&CK coverage

Rule body yaml

Stages and Predicates

Stage 0: condition

Stage 1: selection_method_and_response

Stage 2: selection_uri_upload

Stage 3: selection_uri_search

Indicators

Stage 0: `condition`

Stage 1: `selection_method_and_response`

Stage 2: `selection_uri_upload`

Stage 3: `selection_uri_search`