github - ghsa-hpv8-9rq5-hq7w

GHSA-HPV8-9RQ5-HQ7W

Vulnerability from github – Published: 2021-03-11 03:09 – Updated: 2022-10-25 20:35

Summary

Generated Code Contains Local Information Disclosure Vulnerability

Details

Impact

This vulnerability impacts generated code. If this code was generated as a one-off occasion, not as a part of an automated CI/CD process, this code will remain vulnerable until fixed manually!

On Unix-Like systems, the system temporary directory is shared between all local users. When files/directories are created, the default umask settings for the process are respected. As a result, by default, most processes/apis will create files/directories with the permissions -rw-r--r-- and drwxr-xr-x respectively, unless an API that explicitly sets safe file permissions is used.

Java Code

The method File.createTempFile from the JDK is vulnerable to this local information disclosure vulnerability.

https://github.com/swagger-api/swagger-codegen/blob/068b1ebcb7b04a48ad38f1cadd24bb3810c9f1ab/modules/swagger-codegen/src/main/resources/kotlin-client/infrastructure/ApiClient.kt.mustache#L209
https://github.com/swagger-api/swagger-codegen/blob/068b1ebcb7b04a48ad38f1cadd24bb3810c9f1ab/modules/swagger-codegen/src/main/resources/finch/api.mustache#L84
https://github.com/swagger-api/swagger-codegen/blob/068b1ebcb7b04a48ad38f1cadd24bb3810c9f1ab/modules/swagger-codegen/src/main/resources/Java/libraries/okhttp-gson/ApiClient.mustache#L831-L834
https://github.com/swagger-api/swagger-codegen/blob/068b1ebcb7b04a48ad38f1cadd24bb3810c9f1ab/modules/swagger-codegen/src/main/resources/Java/libraries/jersey2/ApiClient.mustache#L630-L633

Patches

Fix has been applied to the master branch with:

https://github.com/swagger-api/swagger-codegen/commit/35adbd552d5f99b3ff1e0e59da228becc85190f2

included in release: 2.4.19

Workarounds

Users can remediate the vulnerability in non patched version by manually (or programmatically e.g. in CI) updating the generated source code to use java.nio.files.Files temporary file creation instead of java.io.File, e.g. by changing


    if (tempFolderPath == null)
      return File.createTempFile(prefix, suffix);
    else
      return File.createTempFile(prefix, suffix, new File(tempFolderPath));


    if (tempFolderPath == null)
      return Files.createTempFile(prefix, suffix).toFile();
    else
      return Files.createTempFile(Paths.get(tempFolderPath), prefix, suffix).toFile();

or generally changing:


File.createTempFile(prefix, suffix);


Files.createTempFile(prefix, suffix).toFile();

References

For more information

If you have any questions or comments about this advisory:

Email us at security@swagger.io

Original vulnerability report

I'm performing OSS security research under the GitHub Security Lab Bug Bounty program. I've been using a custom CodeQL query to find local temporary directory vulnerabilities in OSS with three custom CodeQL queries.

https://github.com/github/codeql/pull/4388/files#diff-71d36c0f2bd0b08e32866f873f1c906cdc17277e0ad327c0c6cd2c882f30de4f

https://github.com/github/codeql/pull/4388/files#diff-1893a18a8bf43c011d61a7889d0139b998a5a78701a30fe7722eddd4c506aaac

https://github.com/github/codeql/pull/4473

The code generated by the Swagger Generator contains a local information disclosure vulnerability. The system temporary directory, on unix-like systems is shared between multiple users. Information written to this directory, or directories created under this directory that do not correctly set the posix standard permissions can have these directories read/modified by other users.

This code exists in the code generator, in the generated code.

In this case, I believe this is only a local information disclosure. IE. another user can read the information, not replace it.

In particular, the method File.createTempFile from the JDK is vulnerable to this local information disclosure vulnerability.

This is because File.createTempFile creates a file inside of the system temporary directory with the permissions: -rw-r--r--. Thus the contents of this file are viewable by all other users locally on the system.

https://github.com/swagger-api/swagger-codegen/blob/068b1ebcb7b04a48ad38f1cadd24bb3810c9f1ab/modules/swagger-codegen/src/main/resources/kotlin-client/infrastructure/ApiClient.kt.mustache#L209

https://github.com/swagger-api/swagger-codegen/blob/068b1ebcb7b04a48ad38f1cadd24bb3810c9f1ab/modules/swagger-codegen/src/main/resources/finch/api.mustache#L84

https://github.com/swagger-api/swagger-codegen/blob/068b1ebcb7b04a48ad38f1cadd24bb3810c9f1ab/modules/swagger-codegen/src/main/resources/Java/libraries/okhttp-gson/ApiClient.mustache#L831-L834

https://github.com/swagger-api/swagger-codegen/blob/068b1ebcb7b04a48ad38f1cadd24bb3810c9f1ab/modules/swagger-codegen/src/main/resources/Java/libraries/jersey2/ApiClient.mustache#L630-L633

The fix here is to switch to the Files API, instead of File as that appropriately sets the file permissions.

Severity ?

6.2 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Maven",
        "name": "io.swagger:swagger-codegen"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.4.19"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2021-21364"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-200",
      "CWE-378",
      "CWE-732"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2021-03-11T03:08:54Z",
    "nvd_published_at": "2021-03-11T03:15:00Z",
    "severity": "MODERATE"
  },
  "details": "### Impact\n\n**This vulnerability impacts generated code.** If this code was generated as a one-off occasion, not as a part of an automated CI/CD process, this code will remain vulnerable until fixed manually!\n\nOn Unix-Like systems, the system temporary directory is shared between all local users. When files/directories are created, the default `umask` settings for the process are respected. As a result, by default, most processes/apis will create files/directories with the permissions `-rw-r--r--` and `drwxr-xr-x` respectively, unless an API that explicitly sets safe file permissions is used.\n\n#### Java Code\n\nThe method `File.createTempFile` from the JDK is vulnerable to this local information disclosure vulnerability.\n\n- https://github.com/swagger-api/swagger-codegen/blob/068b1ebcb7b04a48ad38f1cadd24bb3810c9f1ab/modules/swagger-codegen/src/main/resources/kotlin-client/infrastructure/ApiClient.kt.mustache#L209\n- https://github.com/swagger-api/swagger-codegen/blob/068b1ebcb7b04a48ad38f1cadd24bb3810c9f1ab/modules/swagger-codegen/src/main/resources/finch/api.mustache#L84\n- https://github.com/swagger-api/swagger-codegen/blob/068b1ebcb7b04a48ad38f1cadd24bb3810c9f1ab/modules/swagger-codegen/src/main/resources/Java/libraries/okhttp-gson/ApiClient.mustache#L831-L834\n- https://github.com/swagger-api/swagger-codegen/blob/068b1ebcb7b04a48ad38f1cadd24bb3810c9f1ab/modules/swagger-codegen/src/main/resources/Java/libraries/jersey2/ApiClient.mustache#L630-L633\n\n### Patches\n\nFix has been applied to the master branch with:\n\n* https://github.com/swagger-api/swagger-codegen/commit/35adbd552d5f99b3ff1e0e59da228becc85190f2\n\nincluded in release: 2.4.19\n\n\n### Workarounds\n\nUsers can remediate the vulnerability in non patched version by manually (or programmatically e.g. in CI) updating the generated source code to use `java.nio.files.Files` temporary file creation instead of `java.io.File`, e.g. by changing\n\n```java\n\n    if (tempFolderPath == null)\n      return File.createTempFile(prefix, suffix);\n    else\n      return File.createTempFile(prefix, suffix, new File(tempFolderPath));\n\n```\n\nto \n\n```java\n\n    if (tempFolderPath == null)\n      return Files.createTempFile(prefix, suffix).toFile();\n    else\n      return Files.createTempFile(Paths.get(tempFolderPath), prefix, suffix).toFile();\n\n```\n\nor generally changing:\n\n```java\n\nFile.createTempFile(prefix, suffix);\n\n```\n\nto \n\n```java\n\nFiles.createTempFile(prefix, suffix).toFile();\n\n```\n\n### References\n\n* [CWE-378: Creation of Temporary File With Insecure Permissions](https://cwe.mitre.org/data/definitions/378.html)\n* [CWE-200: Exposure of Sensitive Information to an Unauthorized Actor](https://cwe.mitre.org/data/definitions/200.html)\n* [CWE-732: Incorrect Permission Assignment for Critical Resource](https://cwe.mitre.org/data/definitions/732.html)\n\n### For more information\nIf you have any questions or comments about this advisory:\n\n* Email us at [security@swagger.io](mailto:security@swagger.io)\n\n#### Original vulnerability report\n\n\u003e I\u0027m performing OSS security research under the GitHub Security Lab Bug Bounty program.\n\u003e I\u0027ve been using a custom CodeQL query to find local temporary directory vulnerabilities in OSS with three custom CodeQL queries.\n\u003e \n\u003e - https://github.com/github/codeql/pull/4388/files#diff-71d36c0f2bd0b08e32866f873f1c906cdc17277e0ad327c0c6cd2c882f30de4f\n\u003e - https://github.com/github/codeql/pull/4388/files#diff-1893a18a8bf43c011d61a7889d0139b998a5a78701a30fe7722eddd4c506aaac\n\u003e - https://github.com/github/codeql/pull/4473\n\u003e \n\u003e The code generated by the Swagger Generator contains a local information disclosure vulnerability. The system temporary directory, on unix-like systems is shared between multiple users. Information written to this directory, or directories created under this directory that do not correctly set the posix standard permissions can have these directories read/modified by other users.\n\u003e \n\u003e ---\n\u003e \n\u003e This code exists in the code generator, in the generated code.\n\u003e \n\u003e In this case, I believe this is only a local information disclosure. IE. another user can read the information, not replace it.\n\u003e \n\u003e In particular, the method `File.createTempFile` from the JDK is vulnerable to this local information disclosure vulnerability.\n\u003e \n\u003e This is because `File.createTempFile` creates a file inside of the system temporary directory with the permissions: `-rw-r--r--`. Thus the contents of this file are viewable by all other users locally on the system.\n\u003e \n\u003e - https://github.com/swagger-api/swagger-codegen/blob/068b1ebcb7b04a48ad38f1cadd24bb3810c9f1ab/modules/swagger-codegen/src/main/resources/kotlin-client/infrastructure/ApiClient.kt.mustache#L209\n\u003e - https://github.com/swagger-api/swagger-codegen/blob/068b1ebcb7b04a48ad38f1cadd24bb3810c9f1ab/modules/swagger-codegen/src/main/resources/finch/api.mustache#L84\n\u003e - https://github.com/swagger-api/swagger-codegen/blob/068b1ebcb7b04a48ad38f1cadd24bb3810c9f1ab/modules/swagger-codegen/src/main/resources/Java/libraries/okhttp-gson/ApiClient.mustache#L831-L834\n\u003e - https://github.com/swagger-api/swagger-codegen/blob/068b1ebcb7b04a48ad38f1cadd24bb3810c9f1ab/modules/swagger-codegen/src/main/resources/Java/libraries/jersey2/ApiClient.mustache#L630-L633\n\u003e \n\u003e The fix here is to switch to the `Files` API, instead of `File` as that appropriately sets the file permissions.\n\u003e ",
  "id": "GHSA-hpv8-9rq5-hq7w",
  "modified": "2022-10-25T20:35:54Z",
  "published": "2021-03-11T03:09:18Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/swagger-api/swagger-codegen/security/advisories/GHSA-hpv8-9rq5-hq7w"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-21364"
    },
    {
      "type": "WEB",
      "url": "https://github.com/swagger-api/swagger-codegen/commit/35adbd552d5f99b3ff1e0e59da228becc85190f2"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Generated Code Contains Local Information Disclosure Vulnerability"
}

CVE-2021-21364 (GCVE-0-2021-21364)

Vulnerability from cvelistv5 – Published: 2021-03-11 03:05 – Updated: 2024-08-03 18:09

Title

Generated Code Contains Local Information Disclosure Vulnerability

Summary

swagger-codegen is an open-source project which contains a template-driven engine to generate documentation, API clients and server stubs in different languages by parsing your OpenAPI / Swagger definition. In swagger-codegen before version 2.4.19, on Unix-Like systems, the system temporary directory is shared between all local users. When files/directories are created, the default `umask` settings for the process are respected. As a result, by default, most processes/apis will create files/directories with the permissions `-rw-r--r--` and `drwxr-xr-x` respectively, unless an API that explicitly sets safe file permissions is used. Because this vulnerability impacts generated code, the generated code will remain vulnerable until fixed manually! This vulnerability is fixed in version 2.4.19. Note this is a distinct vulnerability from CVE-2021-21363.

Severity ?

5.3 (Medium)


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

CWE

CWE-200 - Information Exposure
CWE-378 - Creation of Temporary File With Insecure Permissions
CWE-732 - Incorrect Permission Assignment for Critical Resource

Assigner

GitHub_M

References

URL

Tags

	https://github.com/swagger-api/swagger-codegen/se…	x_refsource_CONFIRM
	https://github.com/swagger-api/swagger-codegen/co…	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	swagger-api	swagger-codegen	Affected: < 2.4.19

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-03T18:09:15.938Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_refsource_CONFIRM",
              "x_transferred"
            ],
            "url": "https://github.com/swagger-api/swagger-codegen/security/advisories/GHSA-hpv8-9rq5-hq7w"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://github.com/swagger-api/swagger-codegen/commit/35adbd552d5f99b3ff1e0e59da228becc85190f2"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "swagger-codegen",
          "vendor": "swagger-api",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 2.4.19"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "swagger-codegen is an open-source project which contains a template-driven engine to generate documentation, API clients and server stubs in different languages by parsing your OpenAPI / Swagger definition. In swagger-codegen before version 2.4.19, on Unix-Like systems, the system temporary directory is shared between all local users. When files/directories are created, the default `umask` settings for the process are respected. As a result, by default, most processes/apis will create files/directories with the permissions `-rw-r--r--` and `drwxr-xr-x` respectively, unless an API that explicitly sets safe file permissions is used. Because this vulnerability impacts generated code, the generated code will remain vulnerable until fixed manually! This vulnerability is fixed in version 2.4.19. Note this is a distinct vulnerability from CVE-2021-21363."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "LOCAL",
            "availabilityImpact": "NONE",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "REQUIRED",
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      "problemTypes": [
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              "description": "CWE-200 Information Exposure",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-378",
              "description": "CWE-378: Creation of Temporary File With Insecure Permissions",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-732",
              "description": "CWE-732 Incorrect Permission Assignment for Critical Resource",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2021-03-11T03:05:16",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
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          ],
          "url": "https://github.com/swagger-api/swagger-codegen/security/advisories/GHSA-hpv8-9rq5-hq7w"
        },
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/swagger-api/swagger-codegen/commit/35adbd552d5f99b3ff1e0e59da228becc85190f2"
        }
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      "source": {
        "advisory": "GHSA-hpv8-9rq5-hq7w",
        "discovery": "UNKNOWN"
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      "title": "Generated Code Contains Local Information Disclosure Vulnerability",
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          "ASSIGNER": "security-advisories@github.com",
          "ID": "CVE-2021-21364",
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        },
        "affects": {
          "vendor": {
            "vendor_data": [
              {
                "product": {
                  "product_data": [
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                      "product_name": "swagger-codegen",
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                          {
                            "version_value": "\u003c 2.4.19"
                          }
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                      }
                    }
                  ]
                },
                "vendor_name": "swagger-api"
              }
            ]
          }
        },
        "data_format": "MITRE",
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        "description": {
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              "value": "swagger-codegen is an open-source project which contains a template-driven engine to generate documentation, API clients and server stubs in different languages by parsing your OpenAPI / Swagger definition. In swagger-codegen before version 2.4.19, on Unix-Like systems, the system temporary directory is shared between all local users. When files/directories are created, the default `umask` settings for the process are respected. As a result, by default, most processes/apis will create files/directories with the permissions `-rw-r--r--` and `drwxr-xr-x` respectively, unless an API that explicitly sets safe file permissions is used. Because this vulnerability impacts generated code, the generated code will remain vulnerable until fixed manually! This vulnerability is fixed in version 2.4.19. Note this is a distinct vulnerability from CVE-2021-21363."
            }
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        },
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            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:H/I:N/A:N",
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          "problemtype_data": [
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              "description": [
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                  "value": "CWE-378: Creation of Temporary File With Insecure Permissions"
                }
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            {
              "description": [
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                  "lang": "eng",
                  "value": "CWE-732 Incorrect Permission Assignment for Critical Resource"
                }
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        "references": {
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              "url": "https://github.com/swagger-api/swagger-codegen/security/advisories/GHSA-hpv8-9rq5-hq7w"
            },
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          "discovery": "UNKNOWN"
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    "datePublished": "2021-03-11T03:05:16",
    "dateReserved": "2020-12-22T00:00:00",
    "dateUpdated": "2024-08-03T18:09:15.938Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

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

GHSA-HPV8-9RQ5-HQ7W

Impact

Java Code

Patches

Workarounds

References

For more information

Original vulnerability report

CVE-2021-21364 (GCVE-0-2021-21364)

Tags

Sightings

Nomenclature