CVE-2023-32681 (GCVE-0-2023-32681)

Vulnerability from cvelistv5 – Published: 2023-05-26 17:02 – Updated: 2025-02-13 16:54
VLAI
Title
Unintended leak of Proxy-Authorization header in requests
Summary
Requests is a HTTP library. Since Requests 2.3.0, Requests has been leaking Proxy-Authorization headers to destination servers when redirected to an HTTPS endpoint. This is a product of how we use `rebuild_proxies` to reattach the `Proxy-Authorization` header to requests. For HTTP connections sent through the tunnel, the proxy will identify the header in the request itself and remove it prior to forwarding to the destination server. However when sent over HTTPS, the `Proxy-Authorization` header must be sent in the CONNECT request as the proxy has no visibility into the tunneled request. This results in Requests forwarding proxy credentials to the destination server unintentionally, allowing a malicious actor to potentially exfiltrate sensitive information. This issue has been patched in version 2.31.0.
Severity
6.1 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:N/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-01-14 19:35 UTC
CWE
  • CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor
Assigner
References
Impacted products
Vendor Product Version CPE status
psf requests Affected: >= 2.3.0, < 2.31.0
guessed Create a notification for this product.
Show details on NVD website
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              "value": "Requests is a HTTP library. Since Requests 2.3.0, Requests has been leaking Proxy-Authorization headers to destination servers when redirected to an HTTPS endpoint. This is a product of how we use `rebuild_proxies` to reattach the `Proxy-Authorization` header to requests. For HTTP connections sent through the tunnel, the proxy will identify the header in the request itself and remove it prior to forwarding to the destination server. However when sent over HTTPS, the `Proxy-Authorization` header must be sent in the CONNECT request as the proxy has no visibility into the tunneled request. This results in Requests forwarding proxy credentials to the destination server unintentionally, allowing a malicious actor to potentially exfiltrate sensitive information. This issue has been patched in version 2.31.0."
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "attackComplexity": "HIGH",
                "attackVector": "NETWORK",
                "availabilityImpact": "NONE",
                "baseScore": 6.1,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "NONE",
                "privilegesRequired": "NONE",
                "scope": "CHANGED",
                "userInteraction": "REQUIRED",
                "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:N/A:N",
                "version": "3.1"
              }
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-200",
                  "description": "CWE-200: Exposure of Sensitive Information to an Unauthorized Actor",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2023-09-17T08:07:02.389Z",
            "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
            "shortName": "GitHub_M"
          },
          "references": [
            {
              "name": "https://github.com/psf/requests/security/advisories/GHSA-j8r2-6x86-q33q",
              "tags": [
                "x_refsource_CONFIRM"
              ],
              "url": "https://github.com/psf/requests/security/advisories/GHSA-j8r2-6x86-q33q"
            },
            {
              "name": "https://github.com/psf/requests/commit/74ea7cf7a6a27a4eeb2ae24e162bcc942a6706d5",
              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://github.com/psf/requests/commit/74ea7cf7a6a27a4eeb2ae24e162bcc942a6706d5"
            },
            {
              "name": "https://github.com/psf/requests/releases/tag/v2.31.0",
              "tags": [
                "x_refsource_MISC"
              ],
              "url": "https://github.com/psf/requests/releases/tag/v2.31.0"
            },
            {
              "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/AW7HNFGYP44RT3DUDQXG2QT3OEV2PJ7Y/"
            },
            {
              "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/KOYASTZDGQG2BWLSNBPL3TQRL2G7QYNZ/"
            },
            {
              "url": "https://lists.debian.org/debian-lts-announce/2023/06/msg00018.html"
            },
            {
              "url": "https://security.gentoo.org/glsa/202309-08"
            }
          ],
          "source": {
            "advisory": "GHSA-j8r2-6x86-q33q",
            "discovery": "UNKNOWN"
          },
          "title": "Unintended leak of Proxy-Authorization header in requests"
        }
      },
      "cveMetadata": {
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "assignerShortName": "GitHub_M",
        "cveId": "CVE-2023-32681",
        "datePublished": "2023-05-26T17:02:52.899Z",
        "dateReserved": "2023-05-11T16:33:45.731Z",
        "dateUpdated": "2025-02-13T16:54:56.639Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}



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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.

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Nomenclature

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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • 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.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.