pysec - pysec-2019-136

pysec-2019-136

Vulnerability from pysec

Published

2019-12-20 23:15

Modified

2020-02-25 17:15

Details

Waitress through version 1.3.1 implemented a "MAY" part of the RFC7230 which states: "Although the line terminator for the start-line and header fields is the sequence CRLF, a recipient MAY recognize a single LF as a line terminator and ignore any preceding CR." Unfortunately if a front-end server does not parse header fields with an LF the same way as it does those with a CRLF it can lead to the front-end and the back-end server parsing the same HTTP message in two different ways. This can lead to a potential for HTTP request smuggling/splitting whereby Waitress may see two requests while the front-end server only sees a single HTTP message. This issue is fixed in Waitress 1.4.0.

Aliases

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "waitress",
        "purl": "pkg:pypi/waitress"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "8eba394ad75deaf9e5cd15b78a3d16b12e6b0eba"
            }
          ],
          "repo": "https://github.com/Pylons/waitress",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.4.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.1",
        "0.2",
        "0.3",
        "0.4",
        "0.5",
        "0.6",
        "0.6.1",
        "0.7",
        "0.8",
        "0.8.1",
        "0.8.2",
        "0.8.3",
        "0.8.4",
        "0.8.5",
        "0.8.6",
        "0.8.7",
        "0.8.8",
        "0.8.9",
        "0.8.10",
        "0.8.11b0",
        "0.9.0b0",
        "0.9.0b1",
        "0.9.0",
        "1.0a1",
        "1.0a2",
        "1.0.0",
        "1.0.1",
        "1.0.2",
        "1.1.0",
        "1.2.0b1",
        "1.2.0b2",
        "1.2.0b3",
        "1.2.0",
        "1.2.1",
        "1.3.0b0",
        "1.3.0",
        "1.3.1"
      ]
    }
  ],
  "aliases": [
    "CVE-2019-16785",
    "GHSA-pg36-wpm5-g57p"
  ],
  "details": "Waitress through version 1.3.1 implemented a \"MAY\" part of the RFC7230 which states: \"Although the line terminator for the start-line and header fields is the sequence CRLF, a recipient MAY recognize a single LF as a line terminator and ignore any preceding CR.\" Unfortunately if a front-end server does not parse header fields with an LF the same way as it does those with a CRLF it can lead to the front-end and the back-end server parsing the same HTTP message in two different ways. This can lead to a potential for HTTP request smuggling/splitting whereby Waitress may see two requests while the front-end server only sees a single HTTP message. This issue is fixed in Waitress 1.4.0.",
  "id": "PYSEC-2019-136",
  "modified": "2020-02-25T17:15:00Z",
  "published": "2019-12-20T23:15:00Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/Pylons/waitress/security/advisories/GHSA-pg36-wpm5-g57p"
    },
    {
      "type": "FIX",
      "url": "https://github.com/Pylons/waitress/commit/8eba394ad75deaf9e5cd15b78a3d16b12e6b0eba"
    },
    {
      "type": "WEB",
      "url": "https://docs.pylonsproject.org/projects/waitress/en/latest/#security-fixes"
    },
    {
      "type": "WEB",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GVDHR2DNKCNQ7YQXISJ45NT4IQDX3LJ7/"
    },
    {
      "type": "WEB",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/LYEOTGWJZVKPRXX2HBNVIYWCX73QYPM5/"
    },
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2020:0720"
    }
  ]
}

ghsa-pg36-wpm5-g57p

Vulnerability from github

Published

2019-12-20 23:03

Modified

2024-11-19 13:55

Severity ?

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

Summary

HTTP Request Smuggling: LF vs CRLF handling in Waitress

Details

Impact

Waitress implemented a "MAY" part of the RFC7230 (https://tools.ietf.org/html/rfc7230#section-3.5) which states:

  Although the line terminator for the start-line and header fields is
  the sequence CRLF, a recipient MAY recognize a single LF as a line
  terminator and ignore any preceding CR.

Unfortunately if a front-end server does not parse header fields with an LF the same way as it does those with a CRLF it can lead to the front-end and the back-end server parsing the same HTTP message in two different ways. This can lead to a potential for HTTP request smuggling/splitting whereby Waitress may see two requests while the front-end server only sees a single HTTP message.

Example:

Content-Length: 100[CRLF] X-Header: x[LF]Content-Length: 0[CRLF]

Would get treated by Waitress as if it were:

Content-Length: 100 X-Header: x Content-Length: 0

This could potentially get used by attackers to split the HTTP request and smuggle a second request in the body of the first.

Patches

This issue is fixed in Waitress 1.4.0. This brings a range of changes to harden Waitress against potential HTTP request confusions, and may change the behaviour of Waitress behind non-conformist proxies.

Waitress no longer implements the MAY part of the specification and instead requires that all lines are terminated correctly with CRLF. If any lines are found with a bare CR or LF a 400 Bad Request is sent back to the requesting entity.

The Pylons Project recommends upgrading as soon as possible, while validating that the changes in Waitress don't cause any changes in behavior.

Workarounds

Various reverse proxies may have protections against sending potentially bad HTTP requests to the backend, and or hardening against potential issues like this. If the reverse proxy doesn't use HTTP/1.1 for connecting to the backend issues are also somewhat mitigated, as HTTP pipelining does not exist in HTTP/1.0 and Waitress will close the connection after every single request (unless the Keep Alive header is explicitly sent... so this is not a fool proof security method)

Issues/more security issues:

open an issue at https://github.com/Pylons/waitress/issues (if not sensitive or security related)
email the Pylons Security mailing list: pylons-project-security@googlegroups.com (if security related)

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "waitress"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.4.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2019-16785"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-444"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2019-12-20T23:01:44Z",
    "nvd_published_at": "2019-12-20T23:15:00Z",
    "severity": "MODERATE"
  },
  "details": "### Impact\n\nWaitress implemented a \u0026amp;quot;MAY\u0026amp;quot; part of the RFC7230 (https://tools.ietf.org/html/rfc7230#section-3.5) which states:\n\n      Although the line terminator for the start-line and header fields is\n      the sequence CRLF, a recipient MAY recognize a single LF as a line\n      terminator and ignore any preceding CR.\n\nUnfortunately if a front-end server does not parse header fields with an LF the same way as it does those with a CRLF it can lead to the front-end and the back-end server parsing the same HTTP message in two different ways. This can lead to a potential for HTTP request smuggling/splitting whereby Waitress may see two requests while the front-end server only sees a single HTTP message.\n\nExample:\n\n```\nContent-Length: 100[CRLF]\nX-Header: x[LF]Content-Length: 0[CRLF]\n```\n\nWould get treated by Waitress as if it were:\n\n```\nContent-Length: 100\nX-Header: x\nContent-Length: 0\n```\n\nThis could potentially get used by attackers to split the HTTP request and smuggle a second request in the body of the first.\n\n\n### Patches\n\nThis issue is fixed in Waitress 1.4.0. This brings a range of changes to harden Waitress against potential HTTP request confusions, and may change the behaviour of Waitress behind non-conformist proxies. \n\nWaitress no longer implements the MAY part of the specification and instead requires that all lines are terminated correctly with CRLF. If any lines are found with a bare CR or LF a 400 Bad Request is sent back to the requesting entity.\n\nThe Pylons Project recommends upgrading as soon as possible, while validating that the changes in Waitress don\u0026amp;#39;t cause any changes in behavior.\n\n### Workarounds\n\nVarious reverse proxies may have protections against sending potentially bad HTTP requests to the backend, and or hardening against potential issues like this. If the reverse proxy doesn\u0026amp;#39;t use HTTP/1.1 for connecting to the backend issues are also somewhat mitigated, as HTTP pipelining does not exist in HTTP/1.0 and Waitress will close the connection after every single request (unless the Keep Alive header is explicitly sent... so this is not a fool proof security method)\n\n### Issues/more security issues:\n\n* open an issue at https://github.com/Pylons/waitress/issues (if not sensitive or security related)\n* email the Pylons Security mailing list: pylons-project-security@googlegroups.com (if security related)",
  "id": "GHSA-pg36-wpm5-g57p",
  "modified": "2024-11-19T13:55:58Z",
  "published": "2019-12-20T23:03:57Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/Pylons/waitress/security/advisories/GHSA-pg36-wpm5-g57p"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2019-16785"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Pylons/waitress/commit/8eba394ad75deaf9e5cd15b78a3d16b12e6b0eba"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2020:0720"
    },
    {
      "type": "WEB",
      "url": "https://docs.pylonsproject.org/projects/waitress/en/latest/#security-fixes"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/Pylons/waitress"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pypa/advisory-database/tree/main/vulns/waitress/PYSEC-2019-136.yaml"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2022/05/msg00011.html"
    },
    {
      "type": "WEB",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GVDHR2DNKCNQ7YQXISJ45NT4IQDX3LJ7"
    },
    {
      "type": "WEB",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/LYEOTGWJZVKPRXX2HBNVIYWCX73QYPM5"
    },
    {
      "type": "WEB",
      "url": "https://www.oracle.com/security-alerts/cpuapr2022.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:L/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "HTTP Request Smuggling: LF vs CRLF handling in Waitress"
}

cve-2019-16785

Vulnerability from cvelistv5

Published

2019-12-20 23:00

Modified

2024-08-05 01:24

Severity ?

7.1 (High) - CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N

Summary

HTTP Request Smuggling: LF vs CRLF handling in Waitress

References

▼	URL	Tags
	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GVDHR2DNKCNQ7YQXISJ45NT4IQDX3LJ7/	vendor-advisory, x_refsource_FEDORA
	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LYEOTGWJZVKPRXX2HBNVIYWCX73QYPM5/	vendor-advisory, x_refsource_FEDORA
	https://access.redhat.com/errata/RHSA-2020:0720	vendor-advisory, x_refsource_REDHAT
	https://www.oracle.com/security-alerts/cpuapr2022.html	x_refsource_MISC
	https://docs.pylonsproject.org/projects/waitress/en/latest/#security-fixes	x_refsource_MISC
	https://github.com/Pylons/waitress/security/advisories/GHSA-pg36-wpm5-g57p	x_refsource_CONFIRM
	https://github.com/Pylons/waitress/commit/8eba394ad75deaf9e5cd15b78a3d16b12e6b0eba	x_refsource_MISC
	https://lists.debian.org/debian-lts-announce/2022/05/msg00011.html	mailing-list, x_refsource_MLIST

Impacted products

▼	Vendor	Product
	Pylons	Waitress

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-05T01:24:47.876Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
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          {
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              "x_transferred"
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          },
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          {
            "name": "RHSA-2020:0720",
            "tags": [
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              "x_refsource_REDHAT",
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            "url": "https://access.redhat.com/errata/RHSA-2020:0720"
          },
          {
            "tags": [
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            "url": "https://www.oracle.com/security-alerts/cpuapr2022.html"
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              "x_refsource_MISC",
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          },
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    ],
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      "metrics": [
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            "attackComplexity": "HIGH",
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          "tags": [
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          "url": "https://www.oracle.com/security-alerts/cpuapr2022.html"
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          "url": "https://docs.pylonsproject.org/projects/waitress/en/latest/#security-fixes"
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          "url": "https://github.com/Pylons/waitress/security/advisories/GHSA-pg36-wpm5-g57p"
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          "tags": [
            "mailing-list",
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          "url": "https://lists.debian.org/debian-lts-announce/2022/05/msg00011.html"
        }
      ],
      "source": {
        "advisory": "GHSA-pg36-wpm5-g57p",
        "discovery": "UNKNOWN"
      },
      "title": "HTTP Request Smuggling: LF vs CRLF handling in Waitress",
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              "name": "RHSA-2020:0720",
              "refsource": "REDHAT",
              "url": "https://access.redhat.com/errata/RHSA-2020:0720"
            },
            {
              "name": "https://www.oracle.com/security-alerts/cpuapr2022.html",
              "refsource": "MISC",
              "url": "https://www.oracle.com/security-alerts/cpuapr2022.html"
            },
            {
              "name": "https://docs.pylonsproject.org/projects/waitress/en/latest/#security-fixes",
              "refsource": "MISC",
              "url": "https://docs.pylonsproject.org/projects/waitress/en/latest/#security-fixes"
            },
            {
              "name": "https://github.com/Pylons/waitress/security/advisories/GHSA-pg36-wpm5-g57p",
              "refsource": "CONFIRM",
              "url": "https://github.com/Pylons/waitress/security/advisories/GHSA-pg36-wpm5-g57p"
            },
            {
              "name": "https://github.com/Pylons/waitress/commit/8eba394ad75deaf9e5cd15b78a3d16b12e6b0eba",
              "refsource": "MISC",
              "url": "https://github.com/Pylons/waitress/commit/8eba394ad75deaf9e5cd15b78a3d16b12e6b0eba"
            },
            {
              "name": "[debian-lts-announce] 20220512 [SECURITY] [DLA 3000-1] waitress security update",
              "refsource": "MLIST",
              "url": "https://lists.debian.org/debian-lts-announce/2022/05/msg00011.html"
            }
          ]
        },
        "source": {
          "advisory": "GHSA-pg36-wpm5-g57p",
          "discovery": "UNKNOWN"
        }
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2019-16785",
    "datePublished": "2019-12-20T23:00:25",
    "dateReserved": "2019-09-24T00:00:00",
    "dateUpdated": "2024-08-05T01:24:47.876Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

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-2019-136

Vulnerability from pysec

ghsa-pg36-wpm5-g57p

Vulnerability from github

Impact

Patches

Workarounds

Issues/more security issues:

cve-2019-16785

Vulnerability from cvelistv5

Tags

Sightings

Nomenclature