CWE-59

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  "details": "### Summary\nOnionShare CLI/Desktop 2.6.3 can follow symbolic links inside a selected Share or Website directory and serve the symlink target rather than limiting access to files physically contained in the selected directory. If a user shares a directory that contains attacker-supplied or otherwise untrusted symlinks, a remote recipient with access to the OnionShare service can read arbitrary local files readable by the OnionShare process that the symlink points to.\n\nThis affects the shipped `onionshare-cli` Python package and the desktop application because both call the same `onionshare_cli.web` file-indexing and streaming code.\n\n### Details\nTested repository: `https://github.com/onionshare/onionshare` at commit `8cc75e1d7e88bd31f7276733449d412bf71c8999`.\n\nAffected product evidence:\n- `cli/pyproject.toml` declares `onionshare_cli` version `2.6.3`.\n- `desktop/pyproject.toml` declares `onionshare` version `2.6.3` and depends on `onionshare_cli` from `../cli`.\n- `cli/setup.py` publishes `onionshare-cli` and includes `onionshare_cli.web` plus templates/static resources.\n- `desktop/setup.py` publishes `onionshare` and exposes both `onionshare` and `onionshare-cli` console scripts.\n\nReachable default/common paths:\n- CLI share mode is the default mode when no `--receive`, `--website`, or `--chat` flag is provided (`cli/onionshare_cli/__init__.py:234-241`) and accepts filesystem paths from CLI arguments (`cli/onionshare_cli/__init__.py:184-189`).\n- CLI website mode is exposed through `--website` (`cli/onionshare_cli/__init__.py:55-59`).\n- Desktop Website mode calls `self.web.website_mode.set_file_info(self.filenames)` before starting (`desktop/onionshare/tab/mode/website_mode/__init__.py:281-287`). Desktop Share mode calls `self.mode.web.share_mode.set_file_info(...)` before serving (`desktop/onionshare/tab/mode/share_mode/threads.py:42-49`).\n- Documentation describes Website mode as selecting files/folders and serving them over OnionShare (`docs/source/features.rst:109-115`).\n\nRoot cause:\n- `SendBaseModeWeb.set_file_info()` expands a single selected directory into immediate children and records `os.path.isfile()` entries without rejecting symlinks (`cli/onionshare_cli/web/send_base_mode.py:73-80`, `cli/onionshare_cli/web/send_base_mode.py:100-130`). On POSIX, `os.path.isfile()` follows a symlink to a regular file.\n- Website mode serves any mapped file path through `stream_individual_file()` (`cli/onionshare_cli/web/website_mode.py:71-97`). `stream_individual_file()` opens the mapped filesystem path directly (`cli/onionshare_cli/web/send_base_mode.py:199-313`, especially `open(file_to_download, \"rb\")` at line 237).\n- Share mode default `/download` can include a symlink target when a single selected folder is expanded into root entries and `ZipWriter.add_file()` calls `self.z.write(filename, ...)` without rejecting symlinks (`cli/onionshare_cli/web/share_mode.py:473-539`, `cli/onionshare_cli/web/share_mode.py:574-580`).\n- Share mode with `--no-autostop-sharing` enables individual file downloads (`cli/onionshare_cli/web/share_mode.py:122-125`) and reaches the same direct streaming sink (`cli/onionshare_cli/web/share_mode.py:430-447`).\n- A partial mitigation exists only for recursive ZIP directory traversal: `ZipWriter.add_dir()` skips `os.path.islink(full_filename)` (`cli/onionshare_cli/web/share_mode.py:582-600`). That mitigation does not cover Website mode, Share individual downloads, or Share ZIP generation for root-level symlinks after the single-folder expansion path.\n\nFalse-positive screening performed:\n- URL path traversal without a mapped entry returned 404; the issue is not raw `../` traversal but symlink following after a selected directory has been indexed.\n- Jinja/template escaping and CSP do not mitigate this because the sink is file read/streaming.\n- Share mode has a symlink skip in recursive ZIP addition, but local PoC confirmed sibling paths still dereference symlinks.\n- The default non-public onion service requires the recipient to know the onion address and private key unless the user opts into public mode; this limits exposure but does not prevent disclosure to an authorized recipient or to anyone with the URL/key.\n\nAffected versions / patched versions:\n- Affected versions: unknown; confirmed in version `2.6.3` at commit `8cc75e1d7e88bd31f7276733449d412bf71c8999`. Earlier versions were not tested during this audit.\n- Patched versions: 2.6.4\n\nSeverity:\n\n- Rationale: `AV:N` because the file is exposed over the OnionShare HTTP service; `AC:H` because exploitation requires the victim to share a directory containing an attacker-influenced or untrusted symlink to a sensitive local file; `PR:L` because the attacker generally needs the OnionShare URL/private key unless the user intentionally runs public mode; `UI:R` because the OnionShare user must select/start sharing the affected directory; `S:U` because the same local process reads and serves the file; `C:H` because the symlink can point at high-value readable local secrets; `I:N/A:N` because the confirmed impact is unintended read/disclosure.\n\n### PoC\nThe following safe local proof uses only temporary files and Flask\u0027s local test client. In this audit environment, several runtime dependencies were absent (`waitress`, `flask_compress`, `flask_socketio`, `unidecode`, `stem`, `qrcode`), so the harness stubbed those imports while executing the real `send_base_mode`, `website_mode`, and `share_mode` vulnerable code paths. No external network traffic was sent and no real secrets were read.\n\nMaintainer reproduction from a clean checkout with normal dependencies can omit the import stubs and run the same object/test-client setup, or can start OnionShare locally with a temporary directory containing the symlink.\n\nPositive setup and trigger:\n```python\nimport os, tempfile, shutil\nfrom onionshare_cli.common import Common\nfrom onionshare_cli.settings import Settings\nfrom onionshare_cli.mode_settings import ModeSettings\nfrom onionshare_cli.web import Web\n\nbase = tempfile.mkdtemp(prefix=\u0027os-symlink-final-poc-\u0027)\noutside = os.path.join(base, \u0027outside-secret.txt\u0027)\nroot = os.path.join(base, \u0027site\u0027)\nos.mkdir(root)\nopen(outside, \u0027w\u0027).write(\u0027OUTSIDE_SECRET_MARKER\u0027)\nos.symlink(outside, os.path.join(root, \u0027link.txt\u0027))\n\ncommon = Common()\ncommon.settings = Settings(common)\n\nw = Web(common, False, ModeSettings(common), \u0027website\u0027)\nw.app.testing = True\nw.website_mode.set_file_info([root])\nwith w.app.test_client() as c:\n    print(c.get(\u0027/link.txt\u0027).status_code)\n    print(c.get(\u0027/link.txt\u0027).get_data(as_text=True))\n\ns = Web(common, False, ModeSettings(common), \u0027share\u0027)\ns.app.testing = True\ns.share_mode.set_file_info([root])\nwith s.app.test_client() as c:\n    print(\u0027OUTSIDE_SECRET_MARKER\u0027 in c.get(\u0027/download\u0027).get_data(as_text=True))\n\ns2 = Web(common, False, ModeSettings(common), \u0027share\u0027)\ns2.app.testing = True\ns2.settings.set(\u0027share\u0027, \u0027autostop_sharing\u0027, False)\ns2.share_mode.set_file_info([root])\nwith s2.app.test_client() as c:\n    print(c.get(\u0027/link.txt\u0027).status_code)\n    print(c.get(\u0027/link.txt\u0027).get_data(as_text=True))\n\nshutil.rmtree(base)\n```\n\nObserved output from this environment after re-running the proof after drafting:\n```text\nwebsite_mapped_link_is_symlink: True\nwebsite_positive_status: 200\nwebsite_positive_body: OUTSIDE_SECRET_MARKER\nwebsite_control_status: 404\nwebsite_control_contains_secret: False\nshare_zip_status: 200\nshare_zip_contains_secret: True\nshare_individual_status: 200\nshare_individual_body: OUTSIDE_SECRET_MARKER\ncleanup_done: true\n```\n\nNegative/control case:\n- Requesting `/missing.txt` in Website mode returned HTTP 404 and did not contain `OUTSIDE_SECRET_MARKER`, showing the proof is not a general path traversal or test harness artifact.\n- Recursive ZIP traversal has a partial control mitigation in `ZipWriter.add_dir()` (`cli/onionshare_cli/web/share_mode.py:593-596`), but the proven variants bypass that sibling mitigation through root-level single-folder expansion and direct file streaming.\n\nCleanup:\n- The PoC deletes the temporary directory with `shutil.rmtree(base)`; the audit run printed `cleanup_done: true`.\n\n### Impact\nA remote recipient of an OnionShare Share or Website service can obtain files outside the selected shared directory if that directory contains a symlink to a readable local file. This can disclose SSH keys, browser profile data, wallet files, documents, or other local secrets readable by the OnionShare process.\n\nThe most realistic attack is a malicious archive/project/export supplied to the OnionShare user that contains a symlink to a sensitive path. If the user extracts or otherwise obtains that directory and shares it with OnionShare, the recipient can request the symlink path through Website mode, Share individual-file mode, or receive it inside the default Share ZIP in the single-folder root-symlink case.\n\nThe issue is especially surprising because one ZIP code path already tries to skip symlinks recursively, which suggests symlink dereference outside the shared tree is not intended.\n\n### Suggested remediation\nReject symlinks and enforce canonical containment both when building the file map and immediately before opening/streaming/zipping a file:\n\n- In `SendBaseModeWeb.set_file_info()`, do not add paths where `os.path.islink(path)` is true.\n- Track selected root directories as canonical `Path.resolve()` values and require every served/zipped file\u0027s resolved path to remain under one of those roots.\n- Re-check the resolved path immediately before `open()` in `stream_individual_file()` and before `ZipWriter.add_file()` / `ZipWriter.add_dir()` to avoid symlink-swap/TOCTOU surprises.\n- Add regression tests for:\n  - Website mode serving a root-level symlink.\n  - Website mode serving a nested symlink.\n  - Share default `/download` ZIP for a single selected folder containing a symlink.\n  - Share `--no-autostop-sharing` individual-file symlink download.\n  - Existing recursive ZIP symlink skip behavior.",
  "id": "GHSA-22p9-r2f5-22mf",
  "modified": "2026-07-31T16:31:37Z",
  "published": "2026-07-31T16:31:37Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/onionshare/onionshare/security/advisories/GHSA-22p9-r2f5-22mf"
    },
    {
      "type": "WEB",
      "url": "https://github.com/onionshare/onionshare/commit/48f31cfac077fcc9c04c67c2a6dbf87d956f5eec"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/onionshare/onionshare"
    },
    {
      "type": "WEB",
      "url": "https://github.com/onionshare/onionshare/releases/tag/v2.6.4"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "OnionShare follows symlinks in shared directories, allowing unintended disclosure of local files"
}

{
  "affected": [],
  "aliases": [
    "CVE-2018-19044"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-59"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2018-11-08T20:29:00Z",
    "severity": "MODERATE"
  },
  "details": "keepalived 2.0.8 didn\u0027t check for pathnames with symlinks when writing data to a temporary file upon a call to PrintData or PrintStats. This allowed local users to overwrite arbitrary files if fs.protected_symlinks is set to 0, as demonstrated by a symlink from /tmp/keepalived.data or /tmp/keepalived.stats to /etc/passwd.",
  "id": "GHSA-2357-m5j6-6jv3",
  "modified": "2022-05-14T00:54:45Z",
  "published": "2022-05-14T00:54:45Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2018-19044"
    },
    {
      "type": "WEB",
      "url": "https://github.com/acassen/keepalived/issues/1048"
    },
    {
      "type": "WEB",
      "url": "https://github.com/acassen/keepalived/commit/04f2d32871bb3b11d7dc024039952f2fe2750306"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2019:2285"
    },
    {
      "type": "WEB",
      "url": "https://bugzilla.suse.com/show_bug.cgi?id=1015141"
    },
    {
      "type": "WEB",
      "url": "https://security.gentoo.org/glsa/201903-01"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    }
  ]
}

{
  "affected": [
    {
      "package": {
        "ecosystem": "crates.io",
        "name": "tar"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.4.16"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2018-20990"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-59"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2021-08-19T21:24:12Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "When unpacking a tarball with the unpack_in-family of functions it\u0027s intended that only files within the specified directory are able to be written. Tarballs with hard links or symlinks, however, can be used to overwrite any file on the filesystem. Tarballs can contain multiple entries for the same file. A tarball which first contains an entry for a hard link or symlink pointing to any file on the filesystem will have the link created, and then afterwards if the same file is listed in the tarball the hard link will be rewritten and any file can be rewritten on the filesystem.",
  "id": "GHSA-2367-c296-3mp2",
  "modified": "2023-06-13T21:53:47Z",
  "published": "2021-08-25T20:43:54Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2018-20990"
    },
    {
      "type": "WEB",
      "url": "https://github.com/alexcrichton/tar-rs/pull/156"
    },
    {
      "type": "WEB",
      "url": "https://github.com/alexcrichton/tar-rs/commit/54651a87ae6ba7d81fcc72ffdee2ea7eca2c7e85"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/alexcrichton/tar-rs"
    },
    {
      "type": "WEB",
      "url": "https://rustsec.org/advisories/RUSTSEC-2018-0002.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Arbitrary file overwrite in tar-rs"
}