GHSA-Q6VM-XQC9-V3FF

Vulnerability from github – Published: 2026-07-28 20:16 – Updated: 2026-07-28 20:16
VLAI
Summary
Fission: Zip Slip in pkg/utils/zip.go:Unarchive allows fetcher to write outside the destination directory
Details

Unarchive in pkg/utils/zip.go joined each archive entry name with the destination directory via filepath.Join and wrote the result without checking whether the resolved path stayed under the destination. A zip entry named ../../tmp/evil therefore landed at /tmp/evil. An attacker who could control a Package.Spec.Source.URL or Deployment.URL archive could induce the fetcher (running as the per-environment pod's fission-fetcher sidecar) to write files anywhere that process could reach: into other tenants' /packages/<ns>/ directories, into mounted secret/config volumes, or into the fetcher's own binary.

### Affected

  • Project: github.com/fission/fission
  • Versions: all up to and including v1.24.0
  • Audited commit: 647c141
  • Component: pkg/utils/zip.go (Unarchive)
  • Configuration: default; triggered when the fetcher downloads and extracts a zip archive

Fix section (paste into the Fix / Patches field)

Fixed in v1.25.0 by:

  • PR #3444 (commit 55704aca) — Unarchive now opens an os.Root on the destination, validates each archive entry name (rejects absolute paths and .. traversal), and refuses symlink entries up front. The os.Root confines every mkdir / create to the destination in the kernel.

Regression coverage: TestUnarchiveZipSlip in pkg/utils/zip_test.go exercises parent-traversal, absolute-path, and symlink entries.

Severity
7.7 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N
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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 1.24.0"
      },
      "package": {
        "ecosystem": "Go",
        "name": "github.com/fission/fission"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.25.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-50567"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-22"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-28T20:16:52Z",
    "nvd_published_at": "2026-06-10T18:17:13Z",
    "severity": "HIGH"
  },
  "details": "`Unarchive` in `pkg/utils/zip.go` joined each archive entry name with the destination directory via `filepath.Join` and wrote the result without checking whether the resolved path stayed under the destination. A zip entry named\n  `../../tmp/evil` therefore landed at `/tmp/evil`. An attacker who could control a `Package.Spec.Source.URL` or `Deployment.URL` archive could induce the fetcher (running as the per-environment pod\u0027s `fission-fetcher` sidecar) to write\n  files anywhere that process could reach: into other tenants\u0027 `/packages/\u003cns\u003e/` directories, into mounted secret/config volumes, or into the fetcher\u0027s own binary.\n\n  ### Affected\n\n  - Project: `github.com/fission/fission`\n  - Versions: all up to and including v1.24.0\n  - Audited commit: `647c141`\n  - Component: `pkg/utils/zip.go` (`Unarchive`)\n  - Configuration: default; triggered when the fetcher downloads and extracts a zip archive\n\n  Fix section (paste into the Fix / Patches field)\n\n  Fixed in [v1.25.0](https://github.com/fission/fission/releases/tag/v1.25.0) by:\n\n  - [PR #3444](https://github.com/fission/fission/pull/3444) (commit [`55704aca`](https://github.com/fission/fission/commit/55704aca1b8d6f45bc7c7c2e4805c7e14875ec0f)) \u2014 `Unarchive` now opens an `os.Root` on the destination, validates each\n  archive entry name (rejects absolute paths and `..` traversal), and refuses symlink entries up front. The `os.Root` confines every `mkdir` / `create` to the destination in the kernel.\n\n  Regression coverage: `TestUnarchiveZipSlip` in `pkg/utils/zip_test.go` exercises parent-traversal, absolute-path, and symlink entries.",
  "id": "GHSA-q6vm-xqc9-v3ff",
  "modified": "2026-07-28T20:16:52Z",
  "published": "2026-07-28T20:16:52Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/fission/fission/security/advisories/GHSA-q6vm-xqc9-v3ff"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-50567"
    },
    {
      "type": "WEB",
      "url": "https://github.com/fission/fission/pull/3444"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/fission/fission"
    },
    {
      "type": "WEB",
      "url": "https://github.com/fission/fission/releases/tag/v1.25.0"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": " Fission: Zip Slip in pkg/utils/zip.go:Unarchive allows fetcher to write outside the destination directory"
}



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