PYSEC-2023-246

Vulnerability from pysec - Published: 2023-11-14 21:15 - Updated: 2023-11-22 23:23

Details

aiohttp is an asynchronous HTTP client/server framework for asyncio and Python. The HTTP parser in AIOHTTP has numerous problems with header parsing, which could lead to request smuggling. This parser is only used when AIOHTTP_NO_EXTENSIONS is enabled (or not using a prebuilt wheel). These bugs have been addressed in commit d5c12ba89 which has been included in release version 3.8.6. Users are advised to upgrade. There are no known workarounds for these issues.

Severity ?

7.5 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Impacted products

Name	purl
aiohttp	pkg:pypi/aiohttp

Aliases

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "aiohttp",
        "purl": "pkg:pypi/aiohttp"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "d5c12ba890557a575c313bb3017910d7616fce3d"
            }
          ],
          "repo": "https://github.com/aio-libs/aiohttp",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.8.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.1",
        "0.10.0",
        "0.10.1",
        "0.10.2",
        "0.11.0",
        "0.12.0",
        "0.13.0",
        "0.13.1",
        "0.14.0",
        "0.14.1",
        "0.14.2",
        "0.14.3",
        "0.14.4",
        "0.15.0",
        "0.15.1",
        "0.15.2",
        "0.15.3",
        "0.16.0",
        "0.16.1",
        "0.16.2",
        "0.16.3",
        "0.16.4",
        "0.16.5",
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        "0.17.0",
        "0.17.1",
        "0.17.2",
        "0.17.3",
        "0.17.4",
        "0.18.0",
        "0.18.1",
        "0.18.2",
        "0.18.3",
        "0.18.4",
        "0.19.0",
        "0.2",
        "0.20.0",
        "0.20.1",
        "0.20.2",
        "0.21.0",
        "0.21.1",
        "0.21.2",
        "0.21.4",
        "0.21.5",
        "0.21.6",
        "0.22.0",
        "0.22.0a0",
        "0.22.0b0",
        "0.22.0b1",
        "0.22.0b2",
        "0.22.0b3",
        "0.22.0b4",
        "0.22.0b5",
        "0.22.0b6",
        "0.22.1",
        "0.22.2",
        "0.22.3",
        "0.22.4",
        "0.22.5",
        "0.3",
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        "0.6.2",
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        "2.3.0a3",
        "2.3.0a4",
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        "3.3.1",
        "3.3.2",
        "3.3.2a0",
        "3.4.0",
        "3.4.0a0",
        "3.4.0a3",
        "3.4.0b1",
        "3.4.0b2",
        "3.4.1",
        "3.4.2",
        "3.4.3",
        "3.4.4",
        "3.5.0",
        "3.5.0a1",
        "3.5.0b1",
        "3.5.0b2",
        "3.5.0b3",
        "3.5.1",
        "3.5.2",
        "3.5.3",
        "3.5.4",
        "3.6.0",
        "3.6.0a0",
        "3.6.0a1",
        "3.6.0a11",
        "3.6.0a12",
        "3.6.0a2",
        "3.6.0a3",
        "3.6.0a4",
        "3.6.0a5",
        "3.6.0a6",
        "3.6.0a7",
        "3.6.0a8",
        "3.6.0a9",
        "3.6.0b0",
        "3.6.1",
        "3.6.1b3",
        "3.6.1b4",
        "3.6.2",
        "3.6.2a0",
        "3.6.2a1",
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        "3.7.4",
        "3.7.4.post0",
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        "3.8.1",
        "3.8.2",
        "3.8.3",
        "3.8.4",
        "3.8.5"
      ]
    }
  ],
  "aliases": [
    "CVE-2023-47627",
    "GHSA-gfw2-4jvh-wgfg"
  ],
  "details": "aiohttp is an asynchronous HTTP client/server framework for asyncio and Python. The HTTP parser in AIOHTTP has numerous problems with header parsing, which could lead to request smuggling. This parser is only used when AIOHTTP_NO_EXTENSIONS is enabled (or not using a prebuilt wheel). These bugs have been addressed in commit `d5c12ba89` which has been included in release version 3.8.6. Users are advised to upgrade. There are no known workarounds for these issues.",
  "id": "PYSEC-2023-246",
  "modified": "2023-11-22T23:23:57.547793+00:00",
  "published": "2023-11-14T21:15:00+00:00",
  "references": [
    {
      "type": "EVIDENCE",
      "url": "https://github.com/aio-libs/aiohttp/security/advisories/GHSA-gfw2-4jvh-wgfg"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/aio-libs/aiohttp/security/advisories/GHSA-gfw2-4jvh-wgfg"
    },
    {
      "type": "FIX",
      "url": "https://github.com/aio-libs/aiohttp/commit/d5c12ba890557a575c313bb3017910d7616fce3d"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-GFW2-4JVH-WGFG

Vulnerability from github – Published: 2023-11-14 22:20 – Updated: 2025-11-03 22:31

Summary

AIOHTTP has problems in HTTP parser (the python one, not llhttp)

Details

Summary

The HTTP parser in AIOHTTP has numerous problems with header parsing, which could lead to request smuggling. This parser is only used when AIOHTTP_NO_EXTENSIONS is enabled (or not using a prebuilt wheel).

Details

Bug 1: Bad parsing of `Content-Length` values

Description

RFC 9110 says this:

Content-Length = 1*DIGIT

AIOHTTP does not enforce this rule, presumably because of an incorrect usage of the builtin int constructor. Because the int constructor accepts + and - prefixes, and digit-separating underscores, using int to parse CL values leads AIOHTTP to significant misinterpretation.

Examples

GET / HTTP/1.1\r\n
Content-Length: -0\r\n
\r\n
X

GET / HTTP/1.1\r\n
Content-Length: +0_1\r\n
\r\n
X

Suggested action

Verify that a Content-Length value consists only of ASCII digits before parsing, as the standard requires.

Bug 2: Improper handling of NUL, CR, and LF in header values

Description

RFC 9110 says this:

Field values containing CR, LF, or NUL characters are invalid and dangerous, due to the varying ways that implementations might parse and interpret those characters; a recipient of CR, LF, or NUL within a field value MUST either reject the message or replace each of those characters with SP before further processing or forwarding of that message.

AIOHTTP's HTTP parser does not enforce this rule, and will happily process header values containing these three forbidden characters without replacing them with SP.

Examples

GET / HTTP/1.1\r\n
Header: v\x00alue\r\n
\r\n

GET / HTTP/1.1\r\n
Header: v\ralue\r\n
\r\n

GET / HTTP/1.1\r\n
Header: v\nalue\r\n
\r\n

Suggested action

Reject all messages with NUL, CR, or LF in a header value. The translation to space thing, while technically allowed, does not seem like a good idea to me.

Bug 3: Improper stripping of whitespace before colon in HTTP headers

Description

RFC 9112 says this:

No whitespace is allowed between the field name and colon. In the past, differences in the handling of such whitespace have led to security vulnerabilities in request routing and response handling. A server MUST reject, with a response status code of 400 (Bad Request), any received request message that contains whitespace between a header field name and colon.

AIOHTTP does not enforce this rule, and will simply strip any whitespace before the colon in an HTTP header.

Example

GET / HTTP/1.1\r\n
Content-Length : 1\r\n
\r\n
X

Suggested action

Reject all messages with whitespace before a colon in a header field, as the standard requires.

PoC

Example requests are embedded in the previous section. To reproduce these bugs, start an AIOHTTP server without llhttp (i.e. AIOHTTP_NO_EXTENSIONS=1) and send the requests given in the previous section. (e.g. by printfing into nc)

Impact

Each of these bugs can be used for request smuggling.

Severity ?

5.3 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

6.9 (Medium)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "aiohttp"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.8.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2023-47627"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-444"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2023-11-14T22:20:59Z",
    "nvd_published_at": "2023-11-14T21:15:12Z",
    "severity": "MODERATE"
  },
  "details": "# Summary\nThe HTTP parser in AIOHTTP has numerous problems with header parsing, which could lead to request smuggling.\nThis parser is only used when `AIOHTTP_NO_EXTENSIONS` is enabled (or not using a prebuilt wheel).\n \n# Details\n\n## Bug 1: Bad parsing of `Content-Length` values\n\n### Description\nRFC 9110 says this:\n\u003e `Content-Length = 1*DIGIT`\n\nAIOHTTP does not enforce this rule, presumably because of an incorrect usage of the builtin `int` constructor. Because the `int` constructor accepts `+` and `-` prefixes, and digit-separating underscores, using `int` to parse CL values leads AIOHTTP to significant misinterpretation.\n\n### Examples\n```\nGET / HTTP/1.1\\r\\n\nContent-Length: -0\\r\\n\n\\r\\n\nX\n```\n```\nGET / HTTP/1.1\\r\\n\nContent-Length: +0_1\\r\\n\n\\r\\n\nX\n```\n\n### Suggested action\nVerify that a `Content-Length` value consists only of ASCII digits before parsing, as the standard requires.\n\n## Bug 2: Improper handling of NUL, CR, and LF in header values\n\n### Description\nRFC 9110 says this:\n\u003e Field values containing CR, LF, or NUL characters are invalid and dangerous, due to the varying ways that implementations might parse and interpret those characters; a recipient of CR, LF, or NUL within a field value MUST either reject the message or replace each of those characters with SP before further processing or forwarding of that message.\n\nAIOHTTP\u0027s HTTP parser does not enforce this rule, and will happily process header values containing these three forbidden characters without replacing them with SP.\n### Examples\n```\nGET / HTTP/1.1\\r\\n\nHeader: v\\x00alue\\r\\n\n\\r\\n\n```\n```\nGET / HTTP/1.1\\r\\n\nHeader: v\\ralue\\r\\n\n\\r\\n\n```\n```\nGET / HTTP/1.1\\r\\n\nHeader: v\\nalue\\r\\n\n\\r\\n\n```\n### Suggested action\nReject all messages with NUL, CR, or LF in a header value. The translation to space thing, while technically allowed, does not seem like a good idea to me.\n\n## Bug 3: Improper stripping of whitespace before colon in HTTP headers\n\n### Description\nRFC 9112 says this:\n\u003e No whitespace is allowed between the field name and colon. In the past, differences in the handling of such whitespace have led to security vulnerabilities in request routing and response handling. A server MUST reject, with a response status code of 400 (Bad Request), any received request message that contains whitespace between a header field name and colon.\n\nAIOHTTP does not enforce this rule, and will simply strip any whitespace before the colon in an HTTP header.\n\n### Example\n```\nGET / HTTP/1.1\\r\\n\nContent-Length : 1\\r\\n\n\\r\\n\nX\n```\n\n### Suggested action\nReject all messages with whitespace before a colon in a header field, as the standard requires.\n\n# PoC\nExample requests are embedded in the previous section. To reproduce these bugs, start an AIOHTTP server without llhttp (i.e. `AIOHTTP_NO_EXTENSIONS=1`) and send the requests given in the previous section. (e.g. by `printf`ing into `nc`)\n\n# Impact\nEach of these bugs can be used for request smuggling.",
  "id": "GHSA-gfw2-4jvh-wgfg",
  "modified": "2025-11-03T22:31:22Z",
  "published": "2023-11-14T22:20:59Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/aio-libs/aiohttp/security/advisories/GHSA-gfw2-4jvh-wgfg"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-47627"
    },
    {
      "type": "WEB",
      "url": "https://github.com/aio-libs/aiohttp/commit/d5c12ba890557a575c313bb3017910d7616fce3d"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/aio-libs/aiohttp"
    },
    {
      "type": "WEB",
      "url": "https://github.com/aio-libs/aiohttp/releases/tag/v3.8.6"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pypa/advisory-database/tree/main/vulns/aiohttp/PYSEC-2023-246.yaml"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/02/msg00002.html"
    },
    {
      "type": "WEB",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/FUSJVQ7OQ55RWL4XAX2F5EZ73N4ZSH6U"
    },
    {
      "type": "WEB",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VDKQ6HM3KNDU4OQI476ZWT4O7DMSIT35"
    },
    {
      "type": "WEB",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WQYQL6WV535EEKSNH7KRARLLMOW5WXDM"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "AIOHTTP has problems in HTTP parser (the python one, not llhttp)"
}

CVE-2023-47627 (GCVE-0-2023-47627)

Vulnerability from cvelistv5 – Published: 2023-11-14 20:48 – Updated: 2025-11-03 20:36

Summary

aiohttp is an asynchronous HTTP client/server framework for asyncio and Python. The HTTP parser in AIOHTTP has numerous problems with header parsing, which could lead to request smuggling. This parser is only used when AIOHTTP_NO_EXTENSIONS is enabled (or not using a prebuilt wheel). These bugs have been addressed in commit `d5c12ba89` which has been included in release version 3.8.6. Users are advised to upgrade. There are no known workarounds for these issues.

Severity ?

5.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

CWE

CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

Assigner

GitHub_M

References

URL

Tags

	https://github.com/aio-libs/aiohttp/security/advi…	x_refsource_CONFIRM
	https://github.com/aio-libs/aiohttp/commit/d5c12b…	x_refsource_MISC
	https://lists.fedoraproject.org/archives/list/pac…
	https://lists.fedoraproject.org/archives/list/pac…
	https://lists.fedoraproject.org/archives/list/pac…

Impacted products

	Vendor	Product	Version
	aio-libs	aiohttp	Affected: < 3.8.6

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2025-11-03T20:36:06.806Z",
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            "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VDKQ6HM3KNDU4OQI476ZWT4O7DMSIT35/"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WQYQL6WV535EEKSNH7KRARLLMOW5WXDM/"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/FUSJVQ7OQ55RWL4XAX2F5EZ73N4ZSH6U/"
          },
          {
            "url": "https://lists.debian.org/debian-lts-announce/2025/02/msg00002.html"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2023-47627",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-01-10T19:22:18.504293Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-10-11T17:02:19.713Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "aiohttp",
          "vendor": "aio-libs",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 3.8.6"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "aiohttp is an asynchronous HTTP client/server framework for asyncio and Python. The HTTP parser in AIOHTTP has numerous problems with header parsing, which could lead to request smuggling. This parser is only used when AIOHTTP_NO_EXTENSIONS is enabled (or not using a prebuilt wheel). These bugs have been addressed in commit `d5c12ba89` which has been included in release version 3.8.6. Users are advised to upgrade. There are no known workarounds for these issues."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-444",
              "description": "CWE-444: Inconsistent Interpretation of HTTP Requests (\u0027HTTP Request/Response Smuggling\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2024-02-05T07:06:04.991Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/aio-libs/aiohttp/security/advisories/GHSA-gfw2-4jvh-wgfg",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/aio-libs/aiohttp/security/advisories/GHSA-gfw2-4jvh-wgfg"
        },
        {
          "name": "https://github.com/aio-libs/aiohttp/commit/d5c12ba890557a575c313bb3017910d7616fce3d",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/aio-libs/aiohttp/commit/d5c12ba890557a575c313bb3017910d7616fce3d"
        },
        {
          "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VDKQ6HM3KNDU4OQI476ZWT4O7DMSIT35/"
        },
        {
          "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WQYQL6WV535EEKSNH7KRARLLMOW5WXDM/"
        },
        {
          "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/FUSJVQ7OQ55RWL4XAX2F5EZ73N4ZSH6U/"
        }
      ],
      "source": {
        "advisory": "GHSA-gfw2-4jvh-wgfg",
        "discovery": "UNKNOWN"
      },
      "title": "Request smuggling in aiohttp"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2023-47627",
    "datePublished": "2023-11-14T20:48:48.076Z",
    "dateReserved": "2023-11-07T16:57:49.244Z",
    "dateUpdated": "2025-11-03T20:36:06.806Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date

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.

Action not permitted

PYSEC-2023-246

GHSA-GFW2-4JVH-WGFG

Summary

Details

Bug 1: Bad parsing of Content-Length values

Description

Examples

Suggested action

Bug 2: Improper handling of NUL, CR, and LF in header values

Description

Examples

Suggested action

Bug 3: Improper stripping of whitespace before colon in HTTP headers

Description

Example

Suggested action

PoC

Impact

CVE-2023-47627 (GCVE-0-2023-47627)

Tags

Sightings

Nomenclature

Bug 1: Bad parsing of `Content-Length` values