GHSA-8H9C-R582-MGGC

Vulnerability from github – Published: 2023-03-07 20:41 – Updated: 2024-10-07 21:17
VLAI
Summary
OWSLib vulnerable to XML External Entity (XXE) Injection
Details

Impact

OWSLib's XML parser (which supports both lxml and xml.etree) does not disable entity resolution for lxml, and could lead to arbitrary file reads from an attacker-controlled XML payload. This affects all XML parsing in the codebase.

Patches

  • Use only lxml for XML handling, adding resolve_entities=False to lxml's parser: https://github.com/geopython/OWSLib/pull/863

Workarounds

patch_well_known_namespaces(etree)
etree.set_default_parser(
    parser=etree.XMLParser(resolve_entities=False)
)

References

Severity
8.2 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:L
8.8 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:L/SC:N/SI:N/SA:N
Show details on source website
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "OWSLib"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.28.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2023-27476"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-611"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2023-03-07T20:41:36Z",
    "nvd_published_at": "2023-03-08T00:15:00Z",
    "severity": "HIGH"
  },
  "details": "### Impact\n\nOWSLib\u0027s XML parser (which supports both `lxml` and `xml.etree`) does not disable entity resolution for `lxml`, and could lead to arbitrary file reads from an attacker-controlled XML payload. This affects all XML parsing in the codebase.\n\n### Patches\n\n- Use only lxml for XML handling, adding `resolve_entities=False` to `lxml`\u0027s parser: https://github.com/geopython/OWSLib/pull/863\n\n### Workarounds\n\n```python\npatch_well_known_namespaces(etree)\netree.set_default_parser(\n    parser=etree.XMLParser(resolve_entities=False)\n)\n```\n\n### References\n\n- [`GHSL-2022-131`](https://securitylab.github.com/advisories/GHSL-2022-131_OWSLib/)\n",
  "id": "GHSA-8h9c-r582-mggc",
  "modified": "2024-10-07T21:17:55Z",
  "published": "2023-03-07T20:41:36Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/geopython/OWSLib/security/advisories/GHSA-8h9c-r582-mggc"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-27476"
    },
    {
      "type": "WEB",
      "url": "https://github.com/geopython/OWSLib/pull/863"
    },
    {
      "type": "WEB",
      "url": "https://github.com/geopython/OWSLib/pull/863/commits/b92687702be9576c0681bb11cad21eb631b9122f"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/geopython/OWSLib"
    },
    {
      "type": "WEB",
      "url": "https://github.com/geopython/OWSLib/releases/tag/0.28.1"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pypa/advisory-database/tree/main/vulns/owslib/PYSEC-2023-86.yaml"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2023/06/msg00032.html"
    },
    {
      "type": "ADVISORY",
      "url": "https://securitylab.github.com/advisories/GHSL-2022-131_owslib"
    },
    {
      "type": "WEB",
      "url": "https://www.debian.org/security/2023/dsa-5426"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:L",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:L/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "OWSLib vulnerable to XML External Entity (XXE) Injection"
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.