github - ghsa-g8r4-p96j-xfxc

ghsa-g8r4-p96j-xfxc

Vulnerability from github

Published

2021-04-16 19:53

Modified

2022-08-11 00:01

Severity ?

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

Summary

Grav's Twig processing allowing dangerous PHP functions by default

Details

Impact

Twig processing of static pages can be enabled in the front matter by any administrative user allowed to create or edit pages. As the Twig processor runs unsandboxed, this behavior can be used to gain arbitrary code execution and elevate privileges on the instance.

Patches

The issue was addressed by preventing dangerous functions from being called in Twig templates. A configuration option has been added to manually allow arbitrary PHP functions (system.twig.safe_functions) and filters (system.twig.safe_filters).

Futures major versions of Grav may disable this functionality by default.

Workarounds

Blocking access to the /admin path from untrusted sources will reduce the probability of exploitation.

References

https://portswigger.net/research/server-side-template-injection
https://blog.sonarsource.com/grav-cms-code-execution-vulnerabilities

For more information

If you have any questions or comments about this advisory, you can contact: - The original reporters, by sending an email to vulnerability.research [at] sonarsource.com; - The maintainers, by opening an issue on this repository.

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 1.7.10"
      },
      "package": {
        "ecosystem": "Packagist",
        "name": "getgrav/grav"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.7.11"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2021-29440"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-94"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2021-04-13T19:55:46Z",
    "nvd_published_at": "2021-04-13T20:15:00Z",
    "severity": "HIGH"
  },
  "details": "### Impact\n\nTwig processing of static pages can be enabled in the front matter by any administrative user allowed to create or edit pages. \nAs the Twig processor runs unsandboxed, this behavior can be used to gain arbitrary code execution and elevate privileges on the instance.\n\n### Patches\n\nThe issue was addressed by preventing dangerous functions from being called in Twig templates. A configuration option has been added to manually allow arbitrary PHP functions (`system.twig.safe_functions`) and filters (`system.twig.safe_filters`). \n\nFutures major versions of Grav may disable this functionality by default. \n\n### Workarounds\n\nBlocking access to the `/admin` path from untrusted sources will reduce the probability of exploitation. \n\n### References\n\n- https://portswigger.net/research/server-side-template-injection\n- https://blog.sonarsource.com/grav-cms-code-execution-vulnerabilities\n\n### For more information\n\nIf you have any questions or comments about this advisory, you can contact:\n  - The original reporters, by sending an email to vulnerability.research [at] sonarsource.com;\n  - The maintainers, by opening an issue on this repository.",
  "id": "GHSA-g8r4-p96j-xfxc",
  "modified": "2022-08-11T00:01:25Z",
  "published": "2021-04-16T19:53:12Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/getgrav/grav/security/advisories/GHSA-g8r4-p96j-xfxc"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-29440"
    },
    {
      "type": "WEB",
      "url": "https://blog.sonarsource.com/grav-cms-code-execution-vulnerabilities"
    },
    {
      "type": "WEB",
      "url": "https://packagist.org/packages/getgrav/grav"
    },
    {
      "type": "WEB",
      "url": "http://packetstormsecurity.com/files/162987/Grav-CMS-1.7.10-Server-Side-Template-Injection.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Grav\u0027s Twig processing allowing dangerous PHP functions by default"
}

CVE-2021-29440 (GCVE-0-2021-29440)

Vulnerability from cvelistv5

Published

2021-04-13 19:55

Modified

2024-08-03 22:02

Severity ?

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

CWE

CWE-94 - {"":"Improper Control of Generation of Code ('Code Injection')"}

Summary

Grav is a file based Web-platform. Twig processing of static pages can be enabled in the front matter by any administrative user allowed to create or edit pages. As the Twig processor runs unsandboxed, this behavior can be used to gain arbitrary code execution and elevate privileges on the instance. The issue was addressed in version 1.7.11.

References

►

URL

Tags

	https://github.com/getgrav/grav/security/advisories/GHSA-g8r4-p96j-xfxc	x_refsource_CONFIRM
	https://packagist.org/packages/getgrav/grav	x_refsource_MISC
	http://packetstormsecurity.com/files/162987/Grav-CMS-1.7.10-Server-Side-Template-Injection.html	x_refsource_MISC
	https://blog.sonarsource.com/grav-cms-code-execution-vulnerabilities	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	getgrav	grav	Version: < 1.7.11

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-03T22:02:51.882Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_refsource_CONFIRM",
              "x_transferred"
            ],
            "url": "https://github.com/getgrav/grav/security/advisories/GHSA-g8r4-p96j-xfxc"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://packagist.org/packages/getgrav/grav"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "http://packetstormsecurity.com/files/162987/Grav-CMS-1.7.10-Server-Side-Template-Injection.html"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://blog.sonarsource.com/grav-cms-code-execution-vulnerabilities"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "grav",
          "vendor": "getgrav",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.7.11"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Grav is a file based Web-platform. Twig processing of static pages can be enabled in the front matter by any administrative user allowed to create or edit pages. As the Twig processor runs unsandboxed, this behavior can be used to gain arbitrary code execution and elevate privileges on the instance. The issue was addressed in version 1.7.11."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.4,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "HIGH",
            "scope": "CHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-94",
              "description": "{\"CWE-94\":\"Improper Control of Generation of Code (\u0027Code Injection\u0027)\"}",
              "lang": "en",
              "type": "CWE"
            }
          ]
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      ],
      "providerMetadata": {
        "dateUpdated": "2022-08-02T15:09:46",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/getgrav/grav/security/advisories/GHSA-g8r4-p96j-xfxc"
        },
        {
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          ],
          "url": "https://packagist.org/packages/getgrav/grav"
        },
        {
          "tags": [
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          "url": "http://packetstormsecurity.com/files/162987/Grav-CMS-1.7.10-Server-Side-Template-Injection.html"
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          "url": "https://blog.sonarsource.com/grav-cms-code-execution-vulnerabilities"
        }
      ],
      "source": {
        "advisory": "GHSA-g8r4-p96j-xfxc",
        "discovery": "UNKNOWN"
      },
      "title": "Twig allowing dangerous PHP functions by default",
      "x_legacyV4Record": {
        "CVE_data_meta": {
          "ASSIGNER": "security-advisories@github.com",
          "ID": "CVE-2021-29440",
          "STATE": "PUBLIC",
          "TITLE": "Twig allowing dangerous PHP functions by default"
        },
        "affects": {
          "vendor": {
            "vendor_data": [
              {
                "product": {
                  "product_data": [
                    {
                      "product_name": "grav",
                      "version": {
                        "version_data": [
                          {
                            "version_value": "\u003c 1.7.11"
                          }
                        ]
                      }
                    }
                  ]
                },
                "vendor_name": "getgrav"
              }
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            }
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        },
        "impact": {
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            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
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            "baseScore": 8.4,
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                }
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        },
        "references": {
          "reference_data": [
            {
              "name": "https://github.com/getgrav/grav/security/advisories/GHSA-g8r4-p96j-xfxc",
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            },
            {
              "name": "https://packagist.org/packages/getgrav/grav",
              "refsource": "MISC",
              "url": "https://packagist.org/packages/getgrav/grav"
            },
            {
              "name": "http://packetstormsecurity.com/files/162987/Grav-CMS-1.7.10-Server-Side-Template-Injection.html",
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              "url": "http://packetstormsecurity.com/files/162987/Grav-CMS-1.7.10-Server-Side-Template-Injection.html"
            },
            {
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  },
  "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

ghsa-g8r4-p96j-xfxc

Vulnerability from github

Impact

Patches

Workarounds

References

For more information

CVE-2021-29440 (GCVE-0-2021-29440)

Vulnerability from cvelistv5

Tags

Sightings

Nomenclature