CWE-1389

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          "value": "Fedify is a TypeScript library for building federated server apps powered by ActivityPub. Fedify previously addressed SSRF/internal network access in GHSA-p9cg-vqcc-grcx by adding public URL validation before runtime document and media fetching. However, the IPv4 validation logic present starting in version 0.11.2 and prior to versions 1.9.12, 1.10.11, 2.0.19, 2.1.15, and 2.2.4 appears incomplete. The `validatePublicUrl()` protection relies on `isValidPublicIPv4Address()` to reject non-public IPv4 destinations. The function blocks common private and local ranges such as `10.0.0.0/8`, `127.0.0.0/8`, `169.254.0.0/16`, `172.16.0.0/12`, and `192.168.0.0/16`, but it still treats several special-use, reserved, multicast, benchmarking, and carrier-grade NAT IPv4 ranges as valid public destinations. Because this validation is used as an SSRF defense before outbound fetches, this appears to be an incomplete mitigation or bypass class for the previous SSRF issue. Versions 1.9.12, 1.10.11, 2.0.19, 2.1.15, and 2.2.4 contain an updated patch."
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          "value": "Vaultwarden is a Bitwarden-compatible server written in Rust. Prior to 1.36.0, Vaultwarden\u0027s /icons/{domain}/icon.png endpoint used src/http_client.rs checks including should_block_address() and post_resolve() that missed decimal, hexadecimal, and octal IP representations, allowing SSRF through the icon-fetching HTTP client for blind internal network or port discovery. This issue is fixed in version 1.36.0."
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      "title": "Vaultwarden: Server-side request forgery (SSRF) via Icon Endpoint Decimal/Hex/Octal IP Bypass"
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          "value": "An incorrect parsing of numbers with different radices vulnerability [CWE-1389] in FortiProxy version 7.4.3 and below, version 7.2.10 and below, version 7.0.17 and below and FortiOS version 7.4.3 and below, version 7.2.8 and below, version 7.0.15 and below IP address validation feature may permit an unauthenticated attacker to bypass the IP blocklist via crafted requests."
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              "value": "\u003cp\u003eIn \u003ca target=\"_blank\" rel=\"nofollow\" href=\"https://github.com/google/nftables\"\u003ehttps://github.com/google/nftables\u003c/a\u003e\u0026nbsp;IP addresses were encoded in the wrong byte order,\u0026nbsp;resulting in an nftables configuration which does not work as intended (might block or not block the desired addresses).\u003cbr\u003e\u003cbr\u003eThis issue affects:\u0026nbsp;\u003ca target=\"_blank\" rel=\"nofollow\" href=\"https://pkg.go.dev/github.com/google/nftables@v0.1.0\"\u003ehttps://pkg.go.dev/github.com/google/nftables@v0.1.0\u003c/a\u003e\u003cbr\u003e\u003cbr\u003eThe bug was fixed in the next released version:\u0026nbsp;\u003ca target=\"_blank\" rel=\"nofollow\" href=\"https://pkg.go.dev/github.com/google/nftables@v0.2.0\"\u003ehttps://pkg.go.dev/github.com/google/nftables@v0.2.0\u003c/a\u003e\u003c/p\u003e"
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  "details": "### Summary\n\nFedify previously addressed SSRF/internal network access in GHSA-p9cg-vqcc-grcx by adding public URL validation before runtime document and media fetching. However, the current IPv4 validation logic appears incomplete.\n\nThe `validatePublicUrl()` protection relies on `isValidPublicIPv4Address()` to reject non-public IPv4 destinations. The function blocks common private and local ranges such as `10.0.0.0/8`, `127.0.0.0/8`, `169.254.0.0/16`, `172.16.0.0/12`, and `192.168.0.0/16`, but it still treats several special-use, reserved, multicast, benchmarking, and carrier-grade NAT IPv4 ranges as valid public destinations.\n\nBecause this validation is used as an SSRF defense before outbound fetches, this appears to be an incomplete mitigation or bypass class for the previous SSRF issue.\n\nI tested this against the current repository code at unreleased version 2.3.0. I used `\u003e=0.11.2, \u003c=2.2.3` as the suspected affected range because 0.11.2 is listed as a patched version for GHSA-p9cg-vqcc-grcx, and this report concerns the post-fix validation logic. Maintainers may adjust the exact affected range.\n\n### Why this is not a duplicate of GHSA-p9cg-vqcc-grcx\n\nGHSA-p9cg-vqcc-grcx covered the original behavior where Fedify fetched ActivityPub object, activity, document, and media URLs without first ensuring that the resolved destination was public.\n\nThis report is about the post-fix validation logic. The current mitigation now performs public URL/IP validation, but the IPv4 classification is incomplete and still treats several special-use ranges as public. Therefore, this is a potential incomplete fix/bypass of the previous SSRF mitigation rather than a re-report of the original issue.\n\nThe affected behavior appears to exist in the patched/current code path, not only in versions listed as vulnerable in the original advisory.\n\n### Affected Code\n\nAffected file:\n\n`packages/vocab-runtime/src/url.ts`\n\nCurrent IPv4 validation logic:\n\n```ts\nexport function isValidPublicIPv4Address(address: string): boolean {\n  const parts = address.split(\".\");\n  const first = parseInt(parts[0]);\n  if (first === 0 || first === 10 || first === 127) return false;\n  const second = parseInt(parts[1]);\n  if (first === 169 \u0026\u0026 second === 254) return false;\n  if (first === 172 \u0026\u0026 second \u003e= 16 \u0026\u0026 second \u003c= 31) return false;\n  if (first === 192 \u0026\u0026 second === 168) return false;\n  return true;\n}\n```\n\nThe important point is that the bypass exists in the mitigation logic itself: the function responsible for deciding whether a destination is public returns true for address ranges that are not globally routable public internet destinations.\n\n### Proof of Concept\n\nI reproduced the IPv4 validation behavior using the same logic:\n\n```ts\nfunction isValidPublicIPv4Address(address) {\n  const parts = address.split(\".\");\n  const first = parseInt(parts[0], 10);\n  if (first === 0 || first === 10 || first === 127) return false;\n\n  const second = parseInt(parts[1], 10);\n  if (first === 169 \u0026\u0026 second === 254) return false;\n  if (first === 172 \u0026\u0026 second \u003e= 16 \u0026\u0026 second \u003c= 31) return false;\n  if (first === 192 \u0026\u0026 second === 168) return false;\n\n  return true;\n}\n\nconst tests = [\n  \"8.8.8.8\",\n  \"127.0.0.1\",\n  \"10.0.0.1\",\n  \"192.168.1.1\",\n  \"169.254.169.254\",\n  \"100.64.0.1\",\n  \"198.18.0.1\",\n  \"224.0.0.1\",\n  \"240.0.0.1\",\n  \"192.0.0.1\",\n  \"192.0.2.1\",\n  \"198.51.100.1\",\n  \"203.0.113.1\"\n];\n\nfor (const ip of tests) {\n  console.log(ip + \" =\u003e \" + isValidPublicIPv4Address(ip));\n}\n```\n\nObserved output:\n\n```\n8.8.8.8 =\u003e true\n127.0.0.1 =\u003e false\n10.0.0.1 =\u003e false\n192.168.1.1 =\u003e false\n169.254.169.254 =\u003e false\n100.64.0.1 =\u003e true\n198.18.0.1 =\u003e true\n224.0.0.1 =\u003e true\n240.0.0.1 =\u003e true\n192.0.0.1 =\u003e true\n192.0.2.1 =\u003e true\n198.51.100.1 =\u003e true\n203.0.113.1 =\u003e true\n```\n\nThe validator correctly blocks some common private and local ranges, but incorrectly allows multiple special-use ranges.\n\n### Examples of incorrectly allowed ranges\n\nImportant examples include:\n\n```\n100.64.0.0/10 Carrier-grade NAT\n198.18.0.0/15 Benchmarking / internal testing networks\n224.0.0.0/4 Multicast\n240.0.0.0/4 Reserved\n192.0.0.0/24 IETF protocol assignments\n```\n\nAdditional correctness examples:\n\n```\n192.0.2.0/24 Documentation range\n198.51.100.0/24 Documentation range\n203.0.113.0/24 Documentation range\n```\n\n## Security Impact\n\nAny Fedify feature that accepts or processes remote ActivityPub object, activity, document, or media URLs and relies on validatePublicUrl() as an SSRF protection boundary may incorrectly allow outbound requests to special-use IPv4 destinations that should not be treated as public internet resources.\n\nThis may allow an attacker-controlled ActivityPub object or media URL to cause a Fedify server to initiate requests to non-public or special-use network ranges, depending on the deployment environment and network routing.\n\nThis is best understood as an incomplete fix/bypass class for the previous SSRF/internal-network-access advisory GHSA-p9cg-vqcc-grcx.\n\n## Suggested Fix\n\nAvoid using a small manual denylist for public IP validation. Instead, validate that the resolved address is globally routable/public.\n\nAt minimum, IPv4 validation should reject all relevant special-use ranges, including:\n\n```\n0.0.0.0/8\n10.0.0.0/8\n100.64.0.0/10\n127.0.0.0/8\n169.254.0.0/16\n172.16.0.0/12\n192.0.0.0/24\n192.0.2.0/24\n192.168.0.0/16\n198.18.0.0/15\n198.51.100.0/24\n203.0.113.0/24\n224.0.0.0/4\n240.0.0.0/4\n```\n\nA safer long-term fix would be to use a maintained IP address classification library that explicitly supports security-sensitive public/global IP validation.\n\nPatch Idea\n\n```ts\nexport function isValidPublicIPv4Address(address: string): boolean {\n  const parts = address.split(\".\").map((part) =\u003e parseInt(part, 10));\n\n  if (\n    parts.length !== 4 ||\n    parts.some((part) =\u003e Number.isNaN(part) || part \u003c 0 || part \u003e 255)\n  ) {\n    return false;\n  }\n\n  const [a, b] = parts;\n\n  if (a === 0) return false;\n  if (a === 10) return false;\n  if (a === 100 \u0026\u0026 b \u003e= 64 \u0026\u0026 b \u003c= 127) return false;\n  if (a === 127) return false;\n  if (a === 169 \u0026\u0026 b === 254) return false;\n  if (a === 172 \u0026\u0026 b \u003e= 16 \u0026\u0026 b \u003c= 31) return false;\n  if (a === 192 \u0026\u0026 b === 0) return false;\n  if (a === 192 \u0026\u0026 b === 168) return false;\n  if (a === 198 \u0026\u0026 (b === 18 || b === 19)) return false;\n  if (a === 198 \u0026\u0026 b === 51) return false;\n  if (a === 203 \u0026\u0026 b === 0) return false;\n  if (a \u003e= 224) return false;\n\n  return true;\n}\n```\n\n\n## Advisory Classification Note\n\nI understand this may be classified either as a new advisory or as an update/incomplete fix for GHSA-p9cg-vqcc-grcx. Since the issue appears to affect the validation logic added after the original SSRF fix, and because the affected code is part of the current security boundary for outbound URL fetching, I wanted to report it privately for maintainer review.\n\n## Disclosure Note\n\nThis report does not attempt to access any real internal network service. The proof focuses on the validation decision itself: multiple non-public or special-use IPv4 ranges are accepted as public by the current SSRF protection logic.\n\n\n\n## Researcher\n\nReported by Chaitanya Garware.",
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    }
  ],
  "summary": "Fedify has an incomplete SSRF mitigation after GHSA-p9cg-vqcc-grcx: validatePublicUrl allows special-use IPv4 ranges"
}