CVE-2023-7080 Arbitrary remote code execution within wrangler dev Workers sandbox

2023-12-2911:58:36

CWE-269

cloudflare

www.cve.org

cve-2023-7080

arbitrary code execution

wrangler dev

workers sandbox

v8 inspector

ssrf vulnerability

origin/host headers

local network access

debugging

CVSS3

8.5

Attack Vector

ADJACENT

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

CHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

NONE

CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N

AI Score

8.5

Confidence

High

EPSS

0.001

Percentile

21.0%

JSON

The V8 inspector intentionally allows arbitrary code execution within the Workers sandbox for debugging. wrangler dev would previously start an inspector server listening on all network interfaces. This would allow an attacker on the local network to connect to the inspector and run arbitrary code. Additionally, the inspector server did not validate Origin/Host headers, granting an attacker that can trick any user on the local network into opening a malicious website the ability to run code. If wrangler dev --remote was being used, an attacker could access production resources if they were bound to the worker.

This issue was fixed in [email protected] and [email protected]. Whilst wrangler dev’s inspector server listens on local interfaces by default as of [email protected], an SSRF vulnerability in miniflare https://github.com/cloudflare/workers-sdk/security/advisories/GHSA-fwvg-2739-22v7 (CVE-2023-7078) allowed access from the local network until [email protected]. [email protected] and [email protected] introduced validation for the Origin/Host headers.

CNA Affected

[
  {
    "defaultStatus": "unaffected",
    "packageName": "wrangler",
    "platforms": [
      "Windows",
      "MacOS",
      "Linux"
    ],
    "product": "wrangler",
    "repo": "https://github.com/cloudflare/workers-sdk",
    "vendor": "Cloudflare",
    "versions": [
      {
        "changes": [
          {
            "at": "3.19.0",
            "status": "unaffected"
          }
        ],
        "lessThanOrEqual": "3.0.0",
        "status": "affected",
        "version": "0",
        "versionType": "patch"
      },
      {
        "changes": [
          {
            "at": "3.19.0",
            "status": "unaffected"
          }
        ],
        "lessThan": "3.19.0",
        "status": "affected",
        "version": "0",
        "versionType": "patch"
      },
      {
        "changes": [
          {
            "at": "2.20.2",
            "status": "unaffected"
          }
        ],
        "lessThanOrEqual": "2.0.0",
        "status": "affected",
        "version": "0",
        "versionType": "patch"
      },
      {
        "changes": [
          {
            "at": "2.20.2",
            "status": "unaffected"
          }
        ],
        "lessThan": "2.20.2",
        "status": "affected",
        "version": "0",
        "versionType": "patch"
      }
    ]
  }
]