pysec - pysec-2021-13

pysec-2021-13

Vulnerability from pysec

Published

2021-05-13 23:15

Modified

2023-07-25 00:34

Details

Aliases

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{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "flask-caching",
        "purl": "pkg:pypi/flask-caching"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.0.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.0.0",
        "1.0.1",
        "1.1.0",
        "1.1.1",
        "1.2.0",
        "1.3.0",
        "1.3.1",
        "1.3.2",
        "1.3.3",
        "1.4.0",
        "1.5.0",
        "1.6.0",
        "1.7.0",
        "1.7.1",
        "1.7.2",
        "1.8.0",
        "1.9.0",
        "1.10.0",
        "1.10.1",
        "1.11.0",
        "1.11.1",
        "2.0.0",
        "2.0.1",
        "2.0.2"
      ]
    }
  ],
  "aliases": [
    "CVE-2021-33026",
    "GHSA-656c-6cxf-hvcv"
  ],
  "details": "The Flask-Caching extension through 1.10.1 for Flask relies on Pickle for serialization, which may lead to remote code execution or local privilege escalation. If an attacker gains access to cache storage (e.g., filesystem, Memcached, Redis, etc.), they can construct a crafted payload, poison the cache, and execute Python code.",
  "id": "PYSEC-2021-13",
  "modified": "2023-07-25T00:34:15.721702Z",
  "published": "2021-05-13T23:15:00Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/sh4nks/flask-caching/pull/209"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-656c-6cxf-hvcv"
    }
  ],
  "withdrawn": "2023-07-25T12:32:00Z"
}

ghsa-656c-6cxf-hvcv

Vulnerability from github

Published

2021-06-18 18:33

Modified

2022-09-20 13:31

Severity ?

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

Summary

Deserialization of Untrusted Data in Flask-Caching

Details

Flask-Cache adds easy cache support to Flask. The Flask-Caching extension through 1.10.1 for Flask relies on Pickle for serialization, which may lead to remote code execution or local privilege escalation. If an attacker gains access to cache storage (e.g., filesystem, Memcached, Redis, etc.), they can construct a crafted payload, poison the cache, and execute Python code.

However, this is not a high-severity issue, as for an attack like this to work, an attacker must:

Be able to write arbitrary values to the cache
Be able to generate a cache key that will collide with a value being read by the application
Cause the application to read a maliciously-injected value

Any situation where all 3 of those is true is a situation where the application has larger problems; for example, if someone's able to inject malicious cached rendered pages into a Flask app's cache, then they can make the website say literally anything they want, regardless of whether it involves the execution of remote code. Basically, the Pickle vulnerability follows from a website already being extremely vulnerable (due to conditions 1 and 2 being met).

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "Flask-Caching"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "1.10.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2021-33026"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-269",
      "CWE-502"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2021-05-17T17:25:38Z",
    "nvd_published_at": "2021-05-13T23:15:00Z",
    "severity": "MODERATE"
  },
  "details": "Flask-Cache adds easy cache support to Flask. The Flask-Caching extension through 1.10.1 for Flask relies on Pickle for serialization, which may lead to remote code execution or local privilege escalation. If an attacker gains access to cache storage (e.g., filesystem, Memcached, Redis, etc.), they can construct a crafted payload, poison the cache, and execute Python code.\n\nHowever, this is not a high-severity issue, as for an attack like this to work, an attacker must:\n\n1. Be able to write arbitrary values to the cache\n2. Be able to generate a cache key that will collide with a value being read by the application\n3. Cause the application to read a maliciously-injected value\n\nAny situation where all 3 of those is true is a situation where the application has larger problems; for example, if someone\u0027s able to inject malicious cached rendered pages into a Flask app\u0027s cache, then they can make the website say literally anything they want, regardless of whether it involves the execution of remote code. Basically, the Pickle vulnerability follows from a website already being extremely vulnerable (due to conditions 1 and 2 being met).",
  "id": "GHSA-656c-6cxf-hvcv",
  "modified": "2022-09-20T13:31:06Z",
  "published": "2021-06-18T18:33:40Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-33026"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pallets-eco/flask-caching/pull/209#issuecomment-1136397937"
    },
    {
      "type": "WEB",
      "url": "https://github.com/sh4nks/flask-caching/pull/209"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-656c-6cxf-hvcv"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pypa/advisory-database/tree/main/vulns/flask-caching/PYSEC-2021-13.yaml"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/sh4nks/flask-caching"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Deserialization of Untrusted Data in Flask-Caching"
}

cve-2021-33026

Vulnerability from cvelistv5

Published

2021-05-13 22:51

Modified

2024-08-03 23:42

Severity ?

9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Summary

The Flask-Caching extension through 1.10.1 for Flask relies on Pickle for serialization, which may lead to remote code execution or local privilege escalation. If an attacker gains access to cache storage (e.g., filesystem, Memcached, Redis, etc.), they can construct a crafted payload, poison the cache, and execute Python code. NOTE: a third party indicates that exploitation is extremely unlikely unless the machine is already compromised; in other cases, the attacker would be unable to write their payload to the cache and generate the required collision

References

▼	URL	Tags
	https://github.com/sh4nks/flask-caching/pull/209	x_refsource_MISC
	https://github.com/pallets-eco/flask-caching/pull/209#issuecomment-1136397937	x_refsource_MISC

Impacted products

Vendor

Product

Version

▼

n/a

Version: n/a

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "affected": [
          {
            "cpes": [
              "cpe:2.3:a:flask-caching_project:flask-caching:*:*:*:*:*:flask:*:*"
            ],
            "defaultStatus": "unknown",
            "product": "flask-caching",
            "vendor": "flask-caching_project",
            "versions": [
              {
                "lessThanOrEqual": "1.10.1",
                "status": "affected",
                "version": "0",
                "versionType": "custom"
              }
            ]
          }
        ],
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "HIGH",
              "baseScore": 9.8,
              "baseSeverity": "CRITICAL",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "HIGH",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2021-33026",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-07-19T18:22:56.685627Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-502",
                "description": "CWE-502 Deserialization of Untrusted Data",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-07-19T18:25:49.436Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      },
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-03T23:42:19.075Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://github.com/sh4nks/flask-caching/pull/209"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://github.com/pallets-eco/flask-caching/pull/209#issuecomment-1136397937"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "n/a",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "The Flask-Caching extension through 1.10.1 for Flask relies on Pickle for serialization, which may lead to remote code execution or local privilege escalation. If an attacker gains access to cache storage (e.g., filesystem, Memcached, Redis, etc.), they can construct a crafted payload, poison the cache, and execute Python code. NOTE: a third party indicates that exploitation is extremely unlikely unless the machine is already compromised; in other cases, the attacker would be unable to write their payload to the cache and generate the required collision"
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "n/a",
              "lang": "en",
              "type": "text"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2022-09-16T22:55:27",
        "orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
        "shortName": "mitre"
      },
      "references": [
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/sh4nks/flask-caching/pull/209"
        },
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/pallets-eco/flask-caching/pull/209#issuecomment-1136397937"
        }
      ],
      "tags": [
        "disputed"
      ],
      "x_legacyV4Record": {
        "CVE_data_meta": {
          "ASSIGNER": "cve@mitre.org",
          "ID": "CVE-2021-33026",
          "STATE": "PUBLIC"
        },
        "affects": {
          "vendor": {
            "vendor_data": [
              {
                "product": {
                  "product_data": [
                    {
                      "product_name": "n/a",
                      "version": {
                        "version_data": [
                          {
                            "version_value": "n/a"
                          }
                        ]
                      }
                    }
                  ]
                },
                "vendor_name": "n/a"
              }
            ]
          }
        },
        "data_format": "MITRE",
        "data_type": "CVE",
        "data_version": "4.0",
        "description": {
          "description_data": [
            {
              "lang": "eng",
              "value": "** DISPUTED ** The Flask-Caching extension through 1.10.1 for Flask relies on Pickle for serialization, which may lead to remote code execution or local privilege escalation. If an attacker gains access to cache storage (e.g., filesystem, Memcached, Redis, etc.), they can construct a crafted payload, poison the cache, and execute Python code. NOTE: a third party indicates that exploitation is extremely unlikely unless the machine is already compromised; in other cases, the attacker would be unable to write their payload to the cache and generate the required collision."
            }
          ]
        },
        "problemtype": {
          "problemtype_data": [
            {
              "description": [
                {
                  "lang": "eng",
                  "value": "n/a"
                }
              ]
            }
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        },
        "references": {
          "reference_data": [
            {
              "name": "https://github.com/sh4nks/flask-caching/pull/209",
              "refsource": "MISC",
              "url": "https://github.com/sh4nks/flask-caching/pull/209"
            },
            {
              "name": "https://github.com/pallets-eco/flask-caching/pull/209#issuecomment-1136397937",
              "refsource": "MISC",
              "url": "https://github.com/pallets-eco/flask-caching/pull/209#issuecomment-1136397937"
            }
          ]
        }
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
    "assignerShortName": "mitre",
    "cveId": "CVE-2021-33026",
    "datePublished": "2021-05-13T22:51:20",
    "dateReserved": "2021-05-13T00:00:00",
    "dateUpdated": "2024-08-03T23:42:19.075Z",
    "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-2021-13

Vulnerability from pysec

ghsa-656c-6cxf-hvcv

Vulnerability from github

cve-2021-33026

Vulnerability from cvelistv5

Tags

Sightings

Nomenclature