77 行
3.2 KiB
JSON
77 行
3.2 KiB
JSON
{
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"canonical_id": "astro--CVE-2025-66202",
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"system_id": "astro",
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"display_name": "Astro",
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"category": "frameworks",
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"advisory_mode": "core",
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"title": "Astro has an Authentication Bypass via Double URL Encoding, a bypass for CVE-2025-64765",
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"summary": "# Authentication Bypass via Double URL Encoding in Astro\n## Bypass for CVE-2025-64765 / GHSA-ggxq-hp9w-j794\n\n---\n\n### Summary\n\nA **double URL encoding bypass** allows any unauthenticated attacker to bypass path-based authentication checks in Astro middleware, granting unauthorized access to protected routes. While the original CVE-2025-64765 (single URL encoding) was fixed in v5.15.8, the fix is insufficient as it only decodes once. By using double-encoded URLs like `/%2561dmin` instead of `/%61dmin`, attackers can still bypass authentication and access protected resources such as `/admin`, `/api/internal`, or any route protected by middleware pathname checks.\n\n\n## Fix \n\nA more secure fix is just decoding once, then if the request has a %xx format, return a 400 error by using something like :\n\n```\nif (containsEncodedCharacters(pathname)) {\n // Multi-level encoding detected - reject request\n return new Response(\n 'Bad Request: Multi-level URL encoding is not allowed',\n {\n status: 400,\n headers: { 'Content-Type': 'text/plain' }\n }\n );\n }\n```",
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"published_at": "2025-12-08T16:26:43Z",
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"updated_at": "2026-02-04T02:27:12.689316Z",
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"severity": "low",
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"cvss_score": 3.1,
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"exploit_status": "unknown",
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"source_confidence": "official",
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"official_source_url": "https://github.com/withastro/astro/security/advisories/GHSA-ggxq-hp9w-j794",
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"secondary_source_urls": [
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"https://github.com/withastro/astro/security/advisories/GHSA-whqg-ppgf-wp8c",
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"https://nvd.nist.gov/vuln/detail/CVE-2025-64765",
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"https://nvd.nist.gov/vuln/detail/CVE-2025-66202",
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"https://github.com/withastro/astro/commit/6f800813516b07bbe12c666a92937525fddb58ce",
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"https://github.com/withastro/astro"
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],
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"aliases": [
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"CVE-2025-66202",
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"GHSA-whqg-ppgf-wp8c"
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],
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"cve_ids": [
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"CVE-2025-66202"
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],
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"ghsa_ids": [
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"GHSA-whqg-ppgf-wp8c"
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],
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"osv_ids": [
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"GHSA-whqg-ppgf-wp8c"
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],
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"affected_versions": [
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"introduced=0, fixed<5.15.8"
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],
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"fixed_versions": [
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"5.15.8"
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],
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"package_name": "astro",
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"render_markdown": true,
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"case_path": "07-framework-security/frameworks/astro/cases/astro-cve-2025-66202.md",
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"secure_code_topics": [
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"authz-server-side-recheck",
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"csp-trusted-types",
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"proxy-trust-boundary"
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],
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"status": "generated",
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"triage_reasons": [],
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"verification_status": "triage-manual",
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"verification_mode": "synthetic",
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"last_verified_at": null,
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"last_run_id": null,
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"evidence_bundle": null,
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"historical_status": null,
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"latest_status": null,
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"browser_evidence": {
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"required": false,
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"present": false,
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"refs": []
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},
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"repro_profile_id": "proxy-boundary-generic",
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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 Astro"
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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": 1
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}
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}
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