LiteLLM Proxy Admin Endpoint SQL Injection — CISA KEV (CVE-2026-42208)

Detects exploitation of CVE-2026-42208 (Critical, CVSS 9.3), an unauthenticated SQL injection in LiteLLM proxy admin endpoints (/team, /key, /user, /spend, /budget). Added to CISA's Known Exploited Vulnerabilities catalog on 2026-05-08 with federal remediation due 2026-05-11; active exploitation observed against financial services and healthcare deployments. The vulnerable endpoint concatenates path / query / body parameters directly into Postgres queries, allowing classic SQLi shapes (tautology authentication bypass `' OR 1=1 --`, UNION-based exfiltration of api_keys / users / model_bindings tables, time-based blind via `pg_sleep()`, DROP / TRUNCATE primitives for destructive impact). This rule detects exploit payloads landing on the admin endpoint surface — focused on the LiteLLM-specific path prefixes so generic SQLi false positives elsewhere do not light up. CWE-89. Patches in LiteLLM >= 1.48.3; this rule detects exploit attempts against unpatched deployments and provides defence-in-depth post-patch by catching the SQLi payload shape regardless of upstream patch state.

建議回應

參考資料

1. 01

   LiteLLM admin endpoint path with classic tautology SQLi (1=1 / true / N=N) + SQL-comment terminator (-- at EOL or /*) — CISA KEV CVE-2026-42208 canonical exploit shape; excludes markdown `#` heading

   欄位: content運算子: regex
2. 02

   LiteLLM admin endpoint path with stacked destructive statement (DROP/TRUNCATE/DELETE TABLE)

   欄位: content運算子: regex
3. 03

   LiteLLM admin endpoint with UNION SELECT exfiltration probe

   欄位: content運算子: regex
4. 04

   LiteLLM admin endpoint with Postgres time-based blind primitive `pg_sleep(N)`

   欄位: content運算子: regex
5. 05

   LiteLLM admin endpoint parameter (team_id/key_id/user_id/customer_id/model_id) carrying a tautology + SQL-comment terminator (handles JSON key form team_id":")

   欄位: content運算子: regex
6. 06

   Admin-endpoint parameter carrying UNION SELECT — exfil chain (handles JSON key form)

   欄位: content運算子: regex
7. 07

   LiteLLM proxy admin path probing Postgres metadata views (information_schema.tables, pg_user, version()) — recon stage of CVE-2026-42208 exploitation; requires concrete metadata identifiers, not bare `current_user`

   欄位: content運算子: regex
8. 08

   LiteLLM admin endpoint with error-based / out-of-band SQLi primitives (extractvalue, updatexml, load_extension)

   欄位: content運算子: regex

攻擊範例（規則會觸發）

1. GET /team/1' OR 1=1 -- HTTP/1.1

2. GET /key/foo'; DROP TABLE api_keys -- 

3. GET /user/1 UNION ALL SELECT api_key, user_id FROM api_keys --

4. GET /spend/bob' AND pg_sleep(5)-- HTTP/1.1

5. {"team_id":"abc' or 1=1 --"}

6. {"key_id":"x' UNION ALL SELECT api_key FROM api_keys --"}

7. litellm proxy /budget/1 information_schema.tables current_user

8. GET /team/1' AND extractvalue(1,concat(0x7e,(SELECT version())))-- HTTP/1.1

以上為真實攻擊 payload 脫敏版本。用於 regression testing。

正常樣本（規則不會觸發）

1. Patch changelog mentioning the CVE should not trigger

   LiteLLM 1.48.3 release notes: parameterised query builder replaces concat in admin endpoints. Mitigates CVE-2026-42208 (CISA KEV).

2. Defensive awareness post about the KEV listing

   CISA added CVE-2026-42208 to the KEV catalog on 2026-05-08 with federal remediation due 2026-05-11.

3. Benign admin-endpoint GET without SQLi payload

   GET /team/abc123 HTTP/1.1

4. Standard /key endpoint POST with normal payload

   curl -X POST /key -d '{"alias":"prod","spend_limit":100}'

5. API documentation describing /spend behaviour

   The /spend endpoint returns aggregated cost per team for the last 30 days.

6. Realistic team_id value with no injection content

   team_id = "team_abc123"

已知誤報情境

• ▸Legitimate documentation or changelog text discussing CVE-2026-42208 patch notes.
• ▸Static analysis tooling output documenting SQLi patterns for defensive purposes.
• ▸CISA KEV catalog entries discussing CVE-2026-42208 for awareness.
• ▸Patched LiteLLM proxy deployments that use parameterised query builders.

title: "LiteLLM Proxy Admin Endpoint SQL Injection — CISA KEV (CVE-2026-42208)"
id: ATR-2026-00451
rule_version: 1
status: experimental
description: >
  Detects exploitation of CVE-2026-42208 (Critical, CVSS 9.3), an
  unauthenticated SQL injection in LiteLLM proxy admin endpoints
  (/team, /key, /user, /spend, /budget). Added to CISA's Known
  Exploited Vulnerabilities catalog on 2026-05-08 with federal
  remediation due 2026-05-11; active exploitation observed against
  financial services and healthcare deployments. The vulnerable
  endpoint concatenates path / query / body parameters directly into
  Postgres queries, allowing classic SQLi shapes (tautology
  authentication bypass `' OR 1=1 --`, UNION-based exfiltration of
  api_keys / users / model_bindings tables, time-based blind via
  `pg_sleep()`, DROP / TRUNCATE primitives for destructive impact).
  This rule detects exploit payloads landing on the admin endpoint
  surface — focused on the LiteLLM-specific path prefixes so generic
  SQLi false positives elsewhere do not light up. CWE-89.
  Patches in LiteLLM >= 1.48.3; this rule detects exploit attempts
  against unpatched deployments and provides defence-in-depth
  post-patch by catching the SQLi payload shape regardless of upstream
  patch state.
author: "ATR Community"
date: "2026/05/12"
schema_version: "0.1"
detection_tier: pattern
maturity: test
severity: critical

references:
  owasp_llm:
    - "LLM05:2025 - Improper Output Handling"
    - "LLM10:2025 - Unbounded Consumption"
  owasp_agentic:
    - "ASI03:2026 - Identity and Privilege Abuse"
    - "ASI07:2026 - Insecure Agent Infrastructure"
  mitre_atlas:
    - "AML.T0049 - Exploit Public-Facing Application"
    - "AML.T0024 - Exfiltration via ML Inference API"
  mitre_attack:
    - "T1190 - Exploit Public-Facing Application"
    - "T1059 - Command and Scripting Interpreter"
  cve:
    - "CVE-2026-42208"

metadata_provenance:
  mitre_atlas: human-reviewed
  mitre_attack: human-reviewed
  owasp_llm: human-reviewed
  owasp_agentic: human-reviewed
  cve: human-reviewed

compliance:
  eu_ai_act:
    - article: "15"
      context: "CVE-2026-42208 allows unauthenticated SQL execution against the LiteLLM proxy backend Postgres, exfiltrating provider API keys, model bindings, and user accounts; Article 15 cybersecurity requirements mandate parameterised queries in any AI control-plane component."
      strength: primary
    - article: "9"
      context: "Article 9 risk management must enumerate proxy admin-endpoint SQLi as a high-risk class — a single bypass exposes every downstream LLM provider key the proxy holds. CISA KEV listing confirms active in-the-wild exploitation."
      strength: primary
  nist_ai_rmf:
    - subcategory: "MP.5.1"
      context: "SQLi payloads targeting AI proxy admin endpoints must be tracked as a primary attack class against AI control-plane infrastructure; CISA KEV inclusion makes this a federally-prioritised remediation."
      strength: primary
    - subcategory: "MG.4.1"
      context: "Active exploitation against LiteLLM proxy admin endpoints requires immediate incident response; this rule generates the alert needed to initiate the MG.4.1 AI incident response process."
      strength: primary
    - subcategory: "MG.2.3"
      context: "Risk treatment plans under MG.2.3 must require parameterised queries on every admin endpoint of any AI proxy / gateway component."
      strength: primary
  iso_42001:
    - clause: "8.6"
      context: "Operational controls under clause 8.6 must prohibit string concatenation of HTTP parameters into SQL queries in any AI control-plane component; parameterised query builders are mandatory."
      strength: primary

tags:
  category: privilege-escalation
  subcategory: admin-endpoint-sqli-cve-kev
  scan_target: both
  confidence: high

agent_source:
  type: tool_call
  framework:
    - litellm
    - any
  provider:
    - any

detection:
  condition: any
  false_positives:
    - "Legitimate documentation or changelog text discussing CVE-2026-42208 patch notes."
    - "Static analysis tooling output documenting SQLi patterns for defensive purposes."
    - "CISA KEV catalog entries discussing CVE-2026-42208 for awareness."
    - "Patched LiteLLM proxy deployments that use parameterised query builders."
  conditions:
    - field: content
      operator: regex
      value: '(?i)/(?:team|key|user|spend|budget|customer|model|organization)/[^?\n]{0,80}[\x27"]\s*(?:or|and)\s+(?:1\s*=+\s*1|true\b|\d+\s*=+\s*\d+)\s*(?:--(?=\s|$|["\x27\)])|/\*)'
      description: "LiteLLM admin endpoint path with classic tautology SQLi (1=1 / true / N=N) + SQL-comment terminator (-- at EOL or /*) — CISA KEV CVE-2026-42208 canonical exploit shape; excludes markdown `#` heading"

    - field: content
      operator: regex
      value: '(?i)/(?:team|key|user|spend|budget|customer|model|organization)/[^?\n]{0,80}[\x27"]?\s*;\s*(?:drop|truncate|delete)\s+(?:table|from)\s+\w'
      description: "LiteLLM admin endpoint path with stacked destructive statement (DROP/TRUNCATE/DELETE TABLE)"

    - field: content
      operator: regex
      value: '(?i)/(?:team|key|user|spend|budget|customer|model|organization)/[^?\n]{0,120}\bunion\s+(?:all\s+)?select\s+'
      description: "LiteLLM admin endpoint with UNION SELECT exfiltration probe"

    - field: content
      operator: regex
      value: '(?i)/(?:team|key|user|spend|budget|customer|model|organization)/[^?\n]{0,120}\bpg_sleep\s*\(\s*\d+\s*\)'
      description: "LiteLLM admin endpoint with Postgres time-based blind primitive `pg_sleep(N)`"

    - field: content
      operator: regex
      value: '(?i)\b(?:team_id|key_id|user_id|customer_id|model_id)\b["\x27]?\s*[:=]\s*["\x27]?[^"\x27\n]{0,40}[\x27"]\s*(?:or|and)\s+(?:1\s*=+\s*1|true\b|\d+\s*=+\s*\d+)\s*(?:--(?=\s|$|["\x27\)])|/\*)'
      description: "LiteLLM admin endpoint parameter (team_id/key_id/user_id/customer_id/model_id) carrying a tautology + SQL-comment terminator (handles JSON key form team_id\":\")"

    - field: content
      operator: regex
      value: '(?i)\b(?:team_id|key_id|user_id|customer_id|model_id)\b[^\n]{0,80}\bunion\s+(?:all\s+)?select\b'
      description: "Admin-endpoint parameter carrying UNION SELECT — exfil chain (handles JSON key form)"

    - field: content
      operator: regex
      value: '(?i)(?:litellm|proxy)\b[^.\n]{0,80}/(?:team|key|user|spend|budget)/[^?\n]{0,120}\b(?:information_schema\.tables|pg_catalog\.\w+|pg_user|pg_shadow|version\s*\(\s*\))\b'
      description: "LiteLLM proxy admin path probing Postgres metadata views (information_schema.tables, pg_user, version()) — recon stage of CVE-2026-42208 exploitation; requires concrete metadata identifiers, not bare `current_user`"

    - field: content
      operator: regex
      value: '(?i)/(?:team|key|user|spend|budget|customer|model|organization)/[^?\n]{0,120}\b(?:extractvalue|updatexml|load_extension)\s*\('
      description: "LiteLLM admin endpoint with error-based / out-of-band SQLi primitives (extractvalue, updatexml, load_extension)"

response:
  actions:
    - block_input
    - alert
    - escalate
    - snapshot
  notify:
    - security_team

remediation: >
  Upgrade LiteLLM proxy to >= 1.48.3 immediately — CISA KEV listing
  with federal remediation due 2026-05-11 means active exploitation
  is occurring in the wild. Rotate every provider API key and user
  credential that the proxy database has held since deployment.
  Audit Postgres logs for queries against api_keys, users,
  model_bindings, and budget tables originating from the proxy
  service account. Replace string-concatenated SQL in admin handlers
  with parameterised queries / a query builder. Restrict admin
  endpoint exposure to a private network or VPN until upgrade is
  verified.

test_cases:
  true_positives:
    - input: "GET /team/1' OR 1=1 -- HTTP/1.1"
      expected: triggered
      description: "Canonical tautology SQLi against /team admin endpoint — CISA KEV CVE-2026-42208 shape"
    - input: 'GET /key/foo''; DROP TABLE api_keys -- '
      expected: triggered
      description: "Stacked DROP TABLE against /key admin endpoint"
    - input: "GET /user/1 UNION ALL SELECT api_key, user_id FROM api_keys --"
      expected: triggered
      description: "UNION-based exfil of api_keys via /user admin endpoint"
    - input: "GET /spend/bob' AND pg_sleep(5)-- HTTP/1.1"
      expected: triggered
      description: "Time-based blind SQLi via pg_sleep on /spend admin endpoint"
    - input: '{"team_id":"abc'' or 1=1 --"}'
      expected: triggered
      description: "team_id parameter carrying tautology + comment terminator"
    - input: '{"key_id":"x'' UNION ALL SELECT api_key FROM api_keys --"}'
      expected: triggered
      description: "key_id parameter with UNION exfil"
    - input: "litellm proxy /budget/1 information_schema.tables current_user"
      expected: triggered
      description: "Recon stage probing Postgres metadata via /budget admin endpoint"
    - input: "GET /team/1' AND extractvalue(1,concat(0x7e,(SELECT version())))-- HTTP/1.1"
      expected: triggered
      description: "Error-based SQLi using extractvalue against /team admin endpoint"
  true_negatives:
    - input: "LiteLLM 1.48.3 release notes: parameterised query builder replaces concat in admin endpoints. Mitigates CVE-2026-42208 (CISA KEV)."
      expected: not_triggered
      description: "Patch changelog mentioning the CVE should not trigger"
    - input: "CISA added CVE-2026-42208 to the KEV catalog on 2026-05-08 with federal remediation due 2026-05-11."
      expected: not_triggered
      description: "Defensive awareness post about the KEV listing"
    - input: "GET /team/abc123 HTTP/1.1"
      expected: not_triggered
      description: "Benign admin-endpoint GET without SQLi payload"
    - input: 'curl -X POST /key -d ''{"alias":"prod","spend_limit":100}'''
      expected: not_triggered
      description: "Standard /key endpoint POST with normal payload"
    - input: "The /spend endpoint returns aggregated cost per team for the last 30 days."
      expected: not_triggered
      description: "API documentation describing /spend behaviour"
    - input: 'team_id = "team_abc123"'
      expected: not_triggered
      description: "Realistic team_id value with no injection content"