GHSA-RXRH-4J9H-XGG9

Vulnerability from github – Published: 2026-07-02 20:32 – Updated: 2026-07-02 20:32
VLAI
Summary
Steeltoe: TLS private keys written to /tmp with default permissions, never deleted
Details

Summary

When MySQL or PostgreSQL service bindings from VCAP_SERVICES include TLS client credentials, the Connectors library writes those credentials to temporary files in Path.GetTempPath() using File.CreateText. On Linux, File.CreateText creates files with mode 0644 (world-readable) under the process umask, and the files are never deleted. The same key material is protected at mode 0400 in /proc/<pid>/environ.

Impact

Any process co-located in the container that runs as a different UID can read the TLS client private key from /tmp and use it to impersonate the application when connecting to the backing database over mutual TLS.

Affected configuration

  • Application is deployed on Cloud Foundry or another environment that populates VCAP_SERVICES with a MySQL or PostgreSQL service binding that includes sslKey credentials.
  • A process running as a different UID shares the container's filesystem.

Mitigations

If an immediate upgrade is not possible, prevent other processes from running in the container under a different UID with access to /tmp.

Severity
4.7 (Medium)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
Show details on source website
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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 4.1.0"
      },
      "package": {
        "ecosystem": "NuGet",
        "name": "Steeltoe.Configuration.Abstractions"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.0.0"
            },
            {
              "fixed": "4.2.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-50267"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-312",
      "CWE-732"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-02T20:32:09Z",
    "nvd_published_at": "2026-06-17T23:17:04Z",
    "severity": "MODERATE"
  },
  "details": "### Summary\n\nWhen MySQL or PostgreSQL service bindings from `VCAP_SERVICES` include TLS client credentials, the Connectors library writes those credentials to temporary files in `Path.GetTempPath()` using `File.CreateText`. On Linux, `File.CreateText` creates files with mode `0644` (world-readable) under the process umask, and the files are never deleted. The same key material is protected at mode `0400` in `/proc/\u003cpid\u003e/environ`.\n\n### Impact\n\nAny process co-located in the container that runs as a different UID can read the TLS client private key from `/tmp` and use it to impersonate the application when connecting to the backing database over mutual TLS.\n\n### Affected configuration\n\n- Application is deployed on Cloud Foundry or another environment that populates `VCAP_SERVICES` with a MySQL or PostgreSQL service binding that includes `sslKey` credentials.\n- A process running as a different UID shares the container\u0027s filesystem.\n\n### Mitigations\n\nIf an immediate upgrade is not possible, prevent other processes from running in the container under a different UID with access to `/tmp`.",
  "id": "GHSA-rxrh-4j9h-xgg9",
  "modified": "2026-07-02T20:32:09Z",
  "published": "2026-07-02T20:32:09Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/SteeltoeOSS/security-advisories/security/advisories/GHSA-rxrh-4j9h-xgg9"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-50267"
    },
    {
      "type": "WEB",
      "url": "https://github.com/SteeltoeOSS/Steeltoe/commit/8dd97cc6c4b184121a4bd1f92f9ac16918433471"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/SteeltoeOSS/security-advisories"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Steeltoe: TLS private keys written to /tmp with default permissions, never deleted"
}



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