pysec - pysec-2020-231

pysec-2020-231

Vulnerability from pysec

Published

2020-01-28 23:15

Modified

2021-08-27 03:22

Details

Feedgen (python feedgen) before 0.9.0 is susceptible to XML Denial of Service attacks. The feedgen library allows supplying XML as content for some of the available fields. This XML will be parsed and integrated into the existing XML tree. During this process, feedgen is vulnerable to XML Denial of Service Attacks (e.g. XML Bomb). This becomes a concern in particular if feedgen is used to include content from untrused sources and if XML (including XHTML) is directly included instead of providing plain tex content only. This problem has been fixed in feedgen 0.9.0 which disallows XML entity expansion and external resources.

Impacted products

Name	purl
feedgen	pkg:pypi/feedgen

Aliases

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "feedgen",
        "purl": "pkg:pypi/feedgen"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "f57a01b20fa4aaaeccfa417f28e66b4084b9d0cf"
            }
          ],
          "repo": "https://github.com/lkiesow/python-feedgen",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.9.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.1",
        "0.2",
        "0.2.1",
        "0.2.2",
        "0.2.2.1",
        "0.2.3",
        "0.2.4",
        "0.2.5",
        "0.2.6",
        "0.2.7",
        "0.2.8",
        "0.3.0",
        "0.3.1",
        "0.3.2",
        "0.4.0",
        "0.4.1",
        "0.5.0",
        "0.5.1",
        "0.6.0",
        "0.6.1",
        "0.7.0",
        "0.8.0"
      ]
    }
  ],
  "aliases": [
    "CVE-2020-5227",
    "GHSA-g8q7-xv52-hf9f"
  ],
  "details": "Feedgen (python feedgen) before 0.9.0 is susceptible to XML Denial of Service attacks. The *feedgen* library allows supplying XML as content for some of the available fields. This XML will be parsed and integrated into the existing XML tree. During this process, feedgen is vulnerable to XML Denial of Service Attacks (e.g. XML Bomb). This becomes a concern in particular if feedgen is used to include content from untrused sources and if XML (including XHTML) is directly included instead of providing plain tex content only. This problem has been fixed in feedgen 0.9.0 which disallows XML entity expansion and external resources.",
  "id": "PYSEC-2020-231",
  "modified": "2021-08-27T03:22:03.690780Z",
  "published": "2020-01-28T23:15:00Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/lkiesow/python-feedgen/security/advisories/GHSA-g8q7-xv52-hf9f"
    },
    {
      "type": "WEB",
      "url": "https://docs.microsoft.com/en-us/archive/msdn-magazine/2009/november/xml-denial-of-service-attacks-and-defenses"
    },
    {
      "type": "FIX",
      "url": "https://github.com/lkiesow/python-feedgen/commit/f57a01b20fa4aaaeccfa417f28e66b4084b9d0cf"
    },
    {
      "type": "WEB",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/T6I5ENUYGFNMIH6ZQ62FZ6VU2WD3SIOI/"
    }
  ]
}

ghsa-g8q7-xv52-hf9f

Vulnerability from github

Published

2020-01-28 22:37

Modified

2024-09-20 17:44

Severity ?

4.4 (Medium) - CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H
5.9 (Medium) - CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Summary

Feedgen Vulnerable to XML Denial of Service Attacks

Details

Impact

The feedgen library allows supplying XML as content for some of the available fields. This XML will be parsed and integrated into the existing XML tree. During this process, feedgen is vulnerable to XML Denial of Service Attacks (e.g. XML Bomb).

This becomes a concern in particular if feedgen is used to include content from untrused sources and if XML (including XHTML) is directly included instead of providing plain tex content only.

Patches

This problem has been fixed in feedgen 0.9.0 which disallows XML entity expansion and external resources.

Workarounds

Updating is strongly recommended and should not be problematic. Nevertheless, as a workaround, avoid providing XML directly to feedgen or ensure that no entity expansion is part of the XML.

References

For more information

If you have any questions or comments about this advisory: - Open an issue in lkiesow/python-feedgen - Send an email to security@lkiesow.de

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "feedgen"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.9.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2020-5227"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-776"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2020-01-28T22:34:51Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "### Impact\n\nThe *feedgen* library allows supplying XML as content for some of the available fields. This XML will be parsed and integrated into the existing XML tree. During this process, feedgen is vulnerable to [XML Denial of Service Attacks](https://docs.microsoft.com/en-us/archive/msdn-magazine/2009/november/xml-denial-of-service-attacks-and-defenses) (e.g. XML Bomb).\n\nThis becomes a concern in particular if feedgen is used to include content from untrused sources and if XML (including XHTML) is directly included instead of providing plain tex content only.\n\n### Patches\n\nThis problem has been fixed in feedgen 0.9.0 which disallows XML entity expansion and external resources.\n\n### Workarounds\n\nUpdating is strongly recommended and should not be problematic. Nevertheless, as a workaround, avoid providing XML directly to feedgen or ensure that no entity expansion is part of the XML. \n\n### References\n\n- [Security Briefs - XML Denial of Service Attacks and Defenses](https://docs.microsoft.com/en-us/archive/msdn-magazine/2009/november/xml-denial-of-service-attacks-and-defenses)\n- [Billion laughs attack](https://en.wikipedia.org/wiki/Billion_laughs_attack#cite_note-2)\n\n### For more information\n\nIf you have any questions or comments about this advisory:\n- Open an issue in [lkiesow/python-feedgen](https://github.com/lkiesow/python-feedgen/issues)\n- Send an email to security@lkiesow.de",
  "id": "GHSA-g8q7-xv52-hf9f",
  "modified": "2024-09-20T17:44:21Z",
  "published": "2020-01-28T22:37:50Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/lkiesow/python-feedgen/security/advisories/GHSA-g8q7-xv52-hf9f"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-5227"
    },
    {
      "type": "WEB",
      "url": "https://github.com/lkiesow/python-feedgen/commit/f57a01b20fa4aaaeccfa417f28e66b4084b9d0cf"
    },
    {
      "type": "WEB",
      "url": "https://docs.microsoft.com/en-us/archive/msdn-magazine/2009/november/xml-denial-of-service-attacks-and-defenses"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/lkiesow/python-feedgen"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pypa/advisory-database/tree/main/vulns/feedgen/PYSEC-2020-231.yaml"
    },
    {
      "type": "WEB",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/T6I5ENUYGFNMIH6ZQ62FZ6VU2WD3SIOI"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Feedgen Vulnerable to XML Denial of Service Attacks"
}

CVE-2020-5227 (GCVE-0-2020-5227)

Vulnerability from cvelistv5

Published

2020-01-28 22:40

Modified

2024-08-04 08:22

Severity ?

4.4 (Medium) - CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H

CWE

CWE-776 - Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion')

Summary

Feedgen (python feedgen) before 0.9.0 is susceptible to XML Denial of Service attacks. The *feedgen* library allows supplying XML as content for some of the available fields. This XML will be parsed and integrated into the existing XML tree. During this process, feedgen is vulnerable to XML Denial of Service Attacks (e.g. XML Bomb). This becomes a concern in particular if feedgen is used to include content from untrused sources and if XML (including XHTML) is directly included instead of providing plain tex content only. This problem has been fixed in feedgen 0.9.0 which disallows XML entity expansion and external resources.

References

►

URL

Tags

	https://github.com/lkiesow/python-feedgen/security/advisories/GHSA-g8q7-xv52-hf9f	x_refsource_CONFIRM
	https://docs.microsoft.com/en-us/archive/msdn-magazine/2009/november/xml-denial-of-service-attacks-and-defenses	x_refsource_MISC
	https://github.com/lkiesow/python-feedgen/commit/f57a01b20fa4aaaeccfa417f28e66b4084b9d0cf	x_refsource_MISC
	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/T6I5ENUYGFNMIH6ZQ62FZ6VU2WD3SIOI/	vendor-advisory, x_refsource_FEDORA

Impacted products

	Vendor	Product	Version
	lkiesow	python-feedgen	Version: < 0.9.0

Show details on NVD website

JSON

To clipboard

{
  "containers": {
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          "dateUpdated": "2024-08-04T08:22:08.917Z",
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          },
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            ],
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          },
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            ],
            "url": "https://github.com/lkiesow/python-feedgen/commit/f57a01b20fa4aaaeccfa417f28e66b4084b9d0cf"
          },
          {
            "name": "FEDORA-2020-8493201e90",
            "tags": [
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          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
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        {
          "product": "python-feedgen",
          "vendor": "lkiesow",
          "versions": [
            {
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        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 4.4,
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        {
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}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
Confirmed: The vulnerability is confirmed from an analyst perspective.
Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
Patched: This vulnerability was successfully patched by the user reporting the sighting.
Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
Not confirmed: The user expresses doubt about the veracity of the vulnerability.
Not patched: This vulnerability was not successfully patched by the user reporting the sighting.

Action not permitted

pysec-2020-231

Vulnerability from pysec

ghsa-g8q7-xv52-hf9f

Vulnerability from github

Impact

Patches

Workarounds

References

For more information

CVE-2020-5227 (GCVE-0-2020-5227)

Vulnerability from cvelistv5

Tags

Sightings

Nomenclature