pysec - pysec-2020-175

pysec-2020-175

Vulnerability from pysec

Published

2020-01-14 20:15

Modified

2020-10-09 13:40

Details

In PyInstaller before version 3.6, only on Windows, a local privilege escalation vulnerability is present in this particular case: If a software using PyInstaller in "onefile" mode is launched by a privileged user (at least more than the current one) which have his "TempPath" resolving to a world writable directory. This is the case for example if the software is launched as a service or as a scheduled task using a system account (TempPath will be C:\Windows\Temp). In order to be exploitable the software has to be (re)started after the attacker launch the exploit program, so for a service launched at startup, a service restart is needed (e.g. after a crash or an upgrade).

Impacted products

Name	purl
pyinstaller	pkg:pypi/pyinstaller

Aliases

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "pyinstaller",
        "purl": "pkg:pypi/pyinstaller"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.5",
        "1.5.1",
        "2.0",
        "2.1",
        "3.0",
        "3.1",
        "3.1.1",
        "3.2",
        "3.2.1",
        "3.3",
        "3.3.1",
        "3.4",
        "3.5"
      ]
    }
  ],
  "aliases": [
    "CVE-2019-16784",
    "GHSA-7fcj-pq9j-wh2r"
  ],
  "details": "In PyInstaller before version 3.6, only on Windows, a local privilege escalation vulnerability is present in this particular case: If a software using PyInstaller in \"onefile\" mode is launched by a privileged user (at least more than the current one) which have his \"TempPath\" resolving to a world writable directory. This is the case for example if the software is launched as a service or as a scheduled task using a system account (TempPath will be C:\\Windows\\Temp). In order to be exploitable the software has to be (re)started after the attacker launch the exploit program, so for a service launched at startup, a service restart is needed (e.g. after a crash or an upgrade).",
  "id": "PYSEC-2020-175",
  "modified": "2020-10-09T13:40:00Z",
  "published": "2020-01-14T20:15:00Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/pyinstaller/pyinstaller/security/advisories/GHSA-7fcj-pq9j-wh2r"
    }
  ]
}

ghsa-7fcj-pq9j-wh2r

Vulnerability from github

Published

2020-01-16 22:18

Modified

2024-10-23 15:54

Severity ?

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

Summary

Local Privilege Escalation in PyInstaller

Details

Impact

Local Privilege Escalation in all Windows software frozen by PyInstaller in "onefile" mode.

The vulnerability is present only on Windows and in this particular case: If a software frozen by PyInstaller in "onefile" mode is launched by a (privileged) user who has his/her "TempPath" resolving to a world writable directory. This is the case e.g. if the software is launched as a service or as a scheduled task using a system account (in which case TempPath will default to C:\Windows\Temp).

In order to be exploitable the software has to be (re)started after the attacker has launched the exploit program. So for a service launched at startup, a service restart is needed (e.g. after a crash or an upgrade).

While PyInstaller itself was not vulnerable, all Windows software frozen by PyInstaller in "onefile" mode is vulnerable.

CVSSv3 score 7.0 (High) CVSSv3 vector CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected - all Windows software frozen by PyInstaller in "onefile" mode

No affected - PyInstaller itself (except if frozen by PyInstaller in "onefile" mode on Windows) - software frozen in "onedir" mode - other platforms (GNU/Linux, OS X, BSD, etc.)

Patches

The problem is patched in commits 42a67148b3bdf9211fda8499fdc5b63acdd7e6cc (fixed code) and be948cf0954707671aa499da17b10c86b6fa5e5c (recompiled bootloaders). Users should upgrade to PyInstaller version 3.6 and rebuild their software.

Workarounds

There is no known workaround. Users using PyInstaller to freeze their Windows software using "onefile" mode should upgrade PyInstaller and rebuild their software.

Credits

This vulnerability was discovered and reported by Farid AYOUJIL (@faridtsl), David HA, Florent LE NIGER and Yann GASCUEL (@lnv42) from Alter Solutions (@AlterSolutions) and fixed in collaboration with Hartmut Goebel (@htgoebel, maintainer of PyInstaller).

Funding Development

PyInstaller is in urgent need of funding to make future security fixes happen, see https://github.com/pyinstaller/pyinstaller/issues/4404 for details.

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "PyInstaller"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2019-16784"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-250"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2020-01-14T20:09:51Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "### Impact\n\nLocal Privilege Escalation in all Windows software frozen by PyInstaller in \"onefile\" mode.\n\nThe vulnerability is present only on Windows and in this particular case: If a **software frozen by PyInstaller in \"onefile\" mode** is launched by a (privileged) user who has **his/her \"TempPath\" resolving to a world writable directory**. This is the case e.g. if the software is launched as a service or as a scheduled task using a system account (in which case TempPath will default to C:\\Windows\\Temp).\n\nIn order to be exploitable the software has to be (re)started after the attacker has launched the exploit program. So for a service launched at startup, a service restart is needed (e.g. after a crash or an upgrade).\n\nWhile PyInstaller itself was not vulnerable, all Windows software frozen by PyInstaller in \"onefile\" mode is vulnerable.\n\nCVSSv3 score 7.0 (High)\nCVSSv3 vector CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H\n\nAffected\n- all Windows software frozen by PyInstaller in \"onefile\" mode\n\nNo affected\n- PyInstaller itself (except if frozen by PyInstaller in \"onefile\" mode on Windows)\n- software frozen in \"one*dir*\" mode\n- other platforms (GNU/Linux, OS X, BSD, etc.)\n\n### Patches\nThe problem is patched in commits 42a67148b3bdf9211fda8499fdc5b63acdd7e6cc (fixed code) and be948cf0954707671aa499da17b10c86b6fa5e5c (recompiled bootloaders). Users should upgrade to PyInstaller version 3.6 and rebuild their software.\n\n### Workarounds\nThere is no known workaround. Users using PyInstaller to freeze their Windows software using \"onefile\" mode should upgrade PyInstaller and rebuild their software.\n\n### Credits\nThis vulnerability was discovered and reported by Farid AYOUJIL (@faridtsl), David HA, Florent LE NIGER and Yann GASCUEL (@lnv42) from Alter Solutions (@AlterSolutions) and fixed in collaboration with\nHartmut Goebel (@htgoebel, maintainer of PyInstaller).\n\n### Funding Development\n\nPyInstaller is in urgent need of funding to make future security fixes happen, see \u003chttps://github.com/pyinstaller/pyinstaller/issues/4404\u003e for details.",
  "id": "GHSA-7fcj-pq9j-wh2r",
  "modified": "2024-10-23T15:54:56Z",
  "published": "2020-01-16T22:18:27Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/pyinstaller/pyinstaller/security/advisories/GHSA-7fcj-pq9j-wh2r"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2019-16784"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pyinstaller/pyinstaller/commit/42a67148b3bdf9211fda8499fdc5b63acdd7e6cc"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pyinstaller/pyinstaller/commit/be948cf0954707671aa499da17b10c86b6fa5e5c"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/pyinstaller/pyinstaller"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pypa/advisory-database/tree/main/vulns/pyinstaller/PYSEC-2020-175.yaml"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Local Privilege Escalation in PyInstaller"
}

CVE-2019-16784 (GCVE-0-2019-16784)

Vulnerability from cvelistv5

Published

2020-01-14 20:10

Modified

2024-08-05 01:24

Severity ?

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

CWE

CWE-250 - Execution with Unnecessary Privileges

Summary

References

URL

Tags

https://github.com/pyinstaller/pyinstaller/security/advisories/GHSA-7fcj-pq9j-wh2r

x_refsource_CONFIRM

Impacted products

	Vendor	Product	Version
	PyInstaller	PyInstaller	Version: < 3.6

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-05T01:24:48.332Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_refsource_CONFIRM",
              "x_transferred"
            ],
            "url": "https://github.com/pyinstaller/pyinstaller/security/advisories/GHSA-7fcj-pq9j-wh2r"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "platforms": [
            "windows"
          ],
          "product": "PyInstaller",
          "vendor": "PyInstaller",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 3.6"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "This vulnerability was discovered and reported by Farid AYOUJIL (@faridtsl), David HA, Florent LE NIGER and Yann GASCUEL (@lnv42) from Alter Solutions (@AlterSolutions) and fixed in collaboration with Hartmut Goebel (@htgoebel)."
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In PyInstaller before version 3.6, only on Windows, a local privilege escalation vulnerability is present in this particular case: If a software using PyInstaller in \"onefile\" mode is launched by a privileged user (at least more than the current one) which have his \"TempPath\" resolving to a world writable directory. This is the case for example if the software is launched as a service or as a scheduled task using a system account (TempPath will be C:\\Windows\\Temp). In order to be exploitable the software has to be (re)started after the attacker launch the exploit program, so for a service launched at startup, a service restart is needed (e.g. after a crash or an upgrade)."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 7,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-250",
              "description": "CWE-250 Execution with Unnecessary Privileges",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2020-01-14T20:10:12",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/pyinstaller/pyinstaller/security/advisories/GHSA-7fcj-pq9j-wh2r"
        }
      ],
      "source": {
        "advisory": "GHSA-7fcj-pq9j-wh2r",
        "discovery": "UNKNOWN"
      },
      "title": "Local Privilege Escalation present only on the Windows version of PyInstaller",
      "x_legacyV4Record": {
        "CVE_data_meta": {
          "ASSIGNER": "security-advisories@github.com",
          "ID": "CVE-2019-16784",
          "STATE": "PUBLIC",
          "TITLE": "Local Privilege Escalation present only on the Windows version of PyInstaller"
        },
        "affects": {
          "vendor": {
            "vendor_data": [
              {
                "product": {
                  "product_data": [
                    {
                      "product_name": "PyInstaller",
                      "version": {
                        "version_data": [
                          {
                            "platform": "windows",
                            "version_value": "\u003c 3.6"
                          }
                        ]
                      }
                    }
                  ]
                },
                "vendor_name": "PyInstaller"
              }
            ]
          }
        },
        "credit": [
          {
            "lang": "eng",
            "value": "This vulnerability was discovered and reported by Farid AYOUJIL (@faridtsl), David HA, Florent LE NIGER and Yann GASCUEL (@lnv42) from Alter Solutions (@AlterSolutions) and fixed in collaboration with Hartmut Goebel (@htgoebel)."
          }
        ],
        "data_format": "MITRE",
        "data_type": "CVE",
        "data_version": "4.0",
        "description": {
          "description_data": [
            {
              "lang": "eng",
              "value": "In PyInstaller before version 3.6, only on Windows, a local privilege escalation vulnerability is present in this particular case: If a software using PyInstaller in \"onefile\" mode is launched by a privileged user (at least more than the current one) which have his \"TempPath\" resolving to a world writable directory. This is the case for example if the software is launched as a service or as a scheduled task using a system account (TempPath will be C:\\Windows\\Temp). In order to be exploitable the software has to be (re)started after the attacker launch the exploit program, so for a service launched at startup, a service restart is needed (e.g. after a crash or an upgrade)."
            }
          ]
        },
        "impact": {
          "cvss": {
            "attackComplexity": "HIGH",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 7,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          }
        },
        "problemtype": {
          "problemtype_data": [
            {
              "description": [
                {
                  "lang": "eng",
                  "value": "CWE-250 Execution with Unnecessary Privileges"
                }
              ]
            }
          ]
        },
        "references": {
          "reference_data": [
            {
              "name": "https://github.com/pyinstaller/pyinstaller/security/advisories/GHSA-7fcj-pq9j-wh2r",
              "refsource": "CONFIRM",
              "url": "https://github.com/pyinstaller/pyinstaller/security/advisories/GHSA-7fcj-pq9j-wh2r"
            }
          ]
        },
        "source": {
          "advisory": "GHSA-7fcj-pq9j-wh2r",
          "discovery": "UNKNOWN"
        }
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2019-16784",
    "datePublished": "2020-01-14T20:10:12",
    "dateReserved": "2019-09-24T00:00:00",
    "dateUpdated": "2024-08-05T01:24:48.332Z",
    "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.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
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-2020-175

Vulnerability from pysec

ghsa-7fcj-pq9j-wh2r

Vulnerability from github

Impact

Patches

Workarounds

Credits

Funding Development

CVE-2019-16784 (GCVE-0-2019-16784)

Vulnerability from cvelistv5

Tags

Sightings

Nomenclature