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GHSA-55rj-x2vc-4whqmedium4.6

Symfony: Twilio SMS Notifier allows unauthenticated webhook injection due to missing X-Twilio-Signature verification

Check your stack

The advisory, in context

Description

The Twilio SMS notifier bridge ships a webhook request parser used to authenticate and decode the status callbacks Twilio POSTs to an application's webhook endpoint. Its doParse(Request $request, #[\SensitiveParameter] string $secret) method receives the configured webhook secret but never reads it; it decodes and returns the payload unconditionally, ignoring the X-Twilio-Signature HMAC header Twilio sends with each request.

As a result, an application that wires up the Twilio webhook endpoint accepts any POST to that URL, even when a signing secret is configured (the recommended setup). An attacker who knows the endpoint exists can submit forged status payloads, fake delivered / failed / undelivered events, leading to delivery-metrics fraud, downstream automation triggers, etc.

Resolution

TwilioRequestParser::doParse() now requires and verifies the X-Twilio-Signature header (HMAC-SHA1 over the full request URL concatenated with the alphabetically-sorted POST parameters, base64-encoded, keyed with the Twilio account auth token) before further processing, using a constant-time comparison.

When no secret is configured the behaviour is unchanged: signature verification remains opt-in, but it is now actually enforced once opted in.

Applications behind a TLS-terminating reverse proxy must configure framework.trusted_proxies and framework.trusted_headers so that Request::getUri() returns the public URL Twilio signed.

The patch for this issue is available here for branch 6.4.

Credits

Symfony would like to thank Himanshu Anand for reporting the issue and Nicolas Grekas for providing the fix.

Affected packages

Start with the recorded fix for your release branch. Check your installed version and test compatibility before upgrading. Fixing this advisory does not rule out other vulnerabilities in the release.

Ecosystem versions

From 6.4.0 before 6.4.40

Fixed in 6.4.40

40 explicitly affected versions

v6.4.0, v6.4.1, v6.4.10, v6.4.11, v6.4.12, v6.4.13, v6.4.14, v6.4.15, v6.4.16, v6.4.17, v6.4.18, v6.4.19, v6.4.2, v6.4.20, v6.4.21, v6.4.22, v6.4.23, v6.4.24, v6.4.25, v6.4.26, v6.4.27, v6.4.28, v6.4.29, v6.4.3, v6.4.30, v6.4.31, v6.4.32, v6.4.33, v6.4.34, v6.4.35, v6.4.36, v6.4.37, v6.4.38, v6.4.39, v6.4.4, v6.4.5, v6.4.6, v6.4.7, v6.4.8, v6.4.9

View affected-version evidence
{
  "ranges": [
    {
      "events": [
        {
          "introduced": "6.4.0"
        },
        {
          "fixed": "6.4.40"
        }
      ],
      "type": "ECOSYSTEM"
    }
  ],
  "versions": [
    "v6.4.0",
    "v6.4.1",
    "v6.4.10",
    "v6.4.11",
    "v6.4.12",
    "v6.4.13",
    "v6.4.14",
    "v6.4.15",
    "v6.4.16",
    "v6.4.17",
    "v6.4.18",
    "v6.4.19",
    "v6.4.2",
    "v6.4.20",
    "v6.4.21",
    "v6.4.22",
    "v6.4.23",
    "v6.4.24",
    "v6.4.25",
    "v6.4.26",
    "v6.4.27",
    "v6.4.28",
    "v6.4.29",
    "v6.4.3",
    "v6.4.30",
    "v6.4.31",
    "v6.4.32",
    "v6.4.33",
    "v6.4.34",
    "v6.4.35",
    "v6.4.36",
    "v6.4.37",
    "v6.4.38",
    "v6.4.39",
    "v6.4.4",
    "v6.4.5",
    "v6.4.6",
    "v6.4.7",
    "v6.4.8",
    "v6.4.9"
  ]
}
Ecosystem versions

From 7.0.0 before 7.4.12

Fixed in 7.4.12

70 explicitly affected versions

v7.0.0, v7.0.1, v7.0.10, v7.0.2, v7.0.3, v7.0.4, v7.0.5, v7.0.6, v7.0.7, v7.0.8, v7.0.9, v7.1.0, v7.1.0-BETA1, v7.1.0-RC1, v7.1.1, v7.1.10, v7.1.11, v7.1.2, v7.1.3, v7.1.4, v7.1.5, v7.1.6, v7.1.7, v7.1.8, v7.1.9, v7.2.0, v7.2.0-BETA1, v7.2.0-BETA2, v7.2.0-RC1, v7.2.1, v7.2.2, v7.2.3, v7.2.4, v7.2.5, v7.2.6, v7.2.7, v7.2.8, v7.2.9, v7.3.0, v7.3.0-BETA1, v7.3.0-BETA2, v7.3.0-RC1, v7.3.1, v7.3.10, v7.3.11, v7.3.2, v7.3.3, v7.3.4, v7.3.5, v7.3.6, v7.3.7, v7.3.8, v7.3.9, v7.4.0, v7.4.0-BETA1, v7.4.0-BETA2, v7.4.0-RC1, v7.4.0-RC2, v7.4.0-RC3, v7.4.1, v7.4.10, v7.4.11, v7.4.2, v7.4.3, v7.4.4, v7.4.5, v7.4.6, v7.4.7, v7.4.8, v7.4.9

View affected-version evidence
{
  "ranges": [
    {
      "events": [
        {
          "introduced": "7.0.0"
        },
        {
          "fixed": "7.4.12"
        }
      ],
      "type": "ECOSYSTEM"
    }
  ],
  "versions": [
    "v7.0.0",
    "v7.0.1",
    "v7.0.10",
    "v7.0.2",
    "v7.0.3",
    "v7.0.4",
    "v7.0.5",
    "v7.0.6",
    "v7.0.7",
    "v7.0.8",
    "v7.0.9",
    "v7.1.0",
    "v7.1.0-BETA1",
    "v7.1.0-RC1",
    "v7.1.1",
    "v7.1.10",
    "v7.1.11",
    "v7.1.2",
    "v7.1.3",
    "v7.1.4",
    "v7.1.5",
    "v7.1.6",
    "v7.1.7",
    "v7.1.8",
    "v7.1.9",
    "v7.2.0",
    "v7.2.0-BETA1",
    "v7.2.0-BETA2",
    "v7.2.0-RC1",
    "v7.2.1",
    "v7.2.2",
    "v7.2.3",
    "v7.2.4",
    "v7.2.5",
    "v7.2.6",
    "v7.2.7",
    "v7.2.8",
    "v7.2.9",
    "v7.3.0",
    "v7.3.0-BETA1",
    "v7.3.0-BETA2",
    "v7.3.0-RC1",
    "v7.3.1",
    "v7.3.10",
    "v7.3.11",
    "v7.3.2",
    "v7.3.3",
    "v7.3.4",
    "v7.3.5",
    "v7.3.6",
    "v7.3.7",
    "v7.3.8",
    "v7.3.9",
    "v7.4.0",
    "v7.4.0-BETA1",
    "v7.4.0-BETA2",
    "v7.4.0-RC1",
    "v7.4.0-RC2",
    "v7.4.0-RC3",
    "v7.4.1",
    "v7.4.10",
    "v7.4.11",
    "v7.4.2",
    "v7.4.3",
    "v7.4.4",
    "v7.4.5",
    "v7.4.6",
    "v7.4.7",
    "v7.4.8",
    "v7.4.9"
  ]
}
Ecosystem versions

From 8.0.0 before 8.0.12

Fixed in 8.0.12

12 explicitly affected versions

v8.0.0, v8.0.1, v8.0.10, v8.0.11, v8.0.2, v8.0.3, v8.0.4, v8.0.5, v8.0.6, v8.0.7, v8.0.8, v8.0.9

View affected-version evidence
{
  "ranges": [
    {
      "events": [
        {
          "introduced": "8.0.0"
        },
        {
          "fixed": "8.0.12"
        }
      ],
      "type": "ECOSYSTEM"
    }
  ],
  "versions": [
    "v8.0.0",
    "v8.0.1",
    "v8.0.10",
    "v8.0.11",
    "v8.0.2",
    "v8.0.3",
    "v8.0.4",
    "v8.0.5",
    "v8.0.6",
    "v8.0.7",
    "v8.0.8",
    "v8.0.9"
  ]
}
Ecosystem versions

From 6.4.0 before 6.4.40

Fixed in 6.4.40

7 explicitly affected versions

v6.4.0, v6.4.13, v6.4.24, v6.4.3, v6.4.32, v6.4.7, v6.4.8

View affected-version evidence
{
  "ranges": [
    {
      "events": [
        {
          "introduced": "6.4.0"
        },
        {
          "fixed": "6.4.40"
        }
      ],
      "type": "ECOSYSTEM"
    }
  ],
  "versions": [
    "v6.4.0",
    "v6.4.13",
    "v6.4.24",
    "v6.4.3",
    "v6.4.32",
    "v6.4.7",
    "v6.4.8"
  ]
}
Ecosystem versions

From 7.0.0 before 7.4.12

Fixed in 7.4.12

20 explicitly affected versions

v7.0.0, v7.0.3, v7.0.7, v7.0.8, v7.1.0, v7.1.0-BETA1, v7.1.0-RC1, v7.1.1, v7.1.6, v7.2.0, v7.2.0-BETA1, v7.2.0-RC1, v7.3.0, v7.3.0-BETA1, v7.3.0-RC1, v7.3.10, v7.4.0, v7.4.0-BETA1, v7.4.0-RC1, v7.4.4

View affected-version evidence
{
  "ranges": [
    {
      "events": [
        {
          "introduced": "7.0.0"
        },
        {
          "fixed": "7.4.12"
        }
      ],
      "type": "ECOSYSTEM"
    }
  ],
  "versions": [
    "v7.0.0",
    "v7.0.3",
    "v7.0.7",
    "v7.0.8",
    "v7.1.0",
    "v7.1.0-BETA1",
    "v7.1.0-RC1",
    "v7.1.1",
    "v7.1.6",
    "v7.2.0",
    "v7.2.0-BETA1",
    "v7.2.0-RC1",
    "v7.3.0",
    "v7.3.0-BETA1",
    "v7.3.0-RC1",
    "v7.3.10",
    "v7.4.0",
    "v7.4.0-BETA1",
    "v7.4.0-RC1",
    "v7.4.4"
  ]
}
Ecosystem versions

From 8.0.0 before 8.0.12

Fixed in 8.0.12

2 explicitly affected versions

v8.0.0, v8.0.4

View affected-version evidence
{
  "ranges": [
    {
      "events": [
        {
          "introduced": "8.0.0"
        },
        {
          "fixed": "8.0.12"
        }
      ],
      "type": "ECOSYSTEM"
    }
  ],
  "versions": [
    "v8.0.0",
    "v8.0.4"
  ]
}

References