ghsa-pgj6-jmj5-wqfx
Vulnerability from github
Published
2022-05-24 19:19
Modified
2022-12-16 20:40
Severity ?
9.0 (Critical) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
Summary
Multiple vulnerabilities allow bypassing path filtering of agent-to-controller access control in Jenkins
Details

The agent-to-controller security subsystem limits which files on the Jenkins controller can be accessed by agent processes.

Multiple vulnerabilities in the file path filtering implementation of Jenkins 2.318 and earlier, LTS 2.303.2 and earlier allow agent processes to read and write arbitrary files on the Jenkins controller file system, and obtain some information about Jenkins controller file systems.

SECURITY-2541 / CVE-2021-21694: FilePath#toURI, FilePath#hasSymlink, FilePath#absolutize, FilePath#isDescendant, and FilePath#get*DiskSpace do not check any permissions.

We expect that most of these vulnerabilities have been present since SECURITY-144 was addressed in the 2014-10-30 security advisory.

Jenkins 2.319, LTS 2.303.3 addresses these security vulnerabilities.

SECURITY-2541 / CVE-2021-21694: FilePath#toURI, FilePath#hasSymlink, FilePath#absolutize, FilePath#isDescendant check stat permission. FilePath#get*DiskSpace methods are no longer allowed to be executed by an agent.

As some common operations are now newly subject to access control, it is expected that plugins sending commands from agents to the controller may start failing. Additionally, the newly introduced path canonicalization means that instances using a custom builds directory (Java system property jenkins.model.Jenkins.buildsDir) or partitioning JENKINS_HOME using symbolic links may fail access control checks. See the documentation for how to customize the configuration in case of problems.

If you are unable to immediately upgrade to Jenkins 2.319, LTS 2.303.3, you can install the Remoting Security Workaround Plugin. It will prevent all agent-to-controller file access using FilePath APIs. Because it is more restrictive than Jenkins 2.319, LTS 2.303.3, more plugins are incompatible with it. Make sure to read the plugin documentation before installing it.

Show details on source website

To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 2.303.2"
      },
      "package": {
        "ecosystem": "Maven",
        "name": "org.jenkins-ci.main:jenkins-core"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.303.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 2.318"
      },
      "package": {
        "ecosystem": "Maven",
        "name": "org.jenkins-ci.main:jenkins-core"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.304"
            },
            {
              "fixed": "2.319"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2021-21694"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-862"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2022-06-24T00:50:59Z",
    "nvd_published_at": "2021-11-04T17:15:00Z",
    "severity": "CRITICAL"
  },
  "details": "The agent-to-controller security subsystem limits which files on the Jenkins controller can be accessed by agent processes.\n\nMultiple vulnerabilities in the file path filtering implementation of Jenkins 2.318 and earlier, LTS 2.303.2 and earlier allow agent processes to read and write arbitrary files on the Jenkins controller file system, and obtain some information about Jenkins controller file systems.\n\nSECURITY-2541 / CVE-2021-21694: `FilePath#toURI`, `FilePath#hasSymlink`, `FilePath#absolutize`, `FilePath#isDescendant`, and `FilePath#get*DiskSpace` do not check any permissions.\n\nWe expect that most of these vulnerabilities have been present since [SECURITY-144 was addressed in the 2014-10-30 security advisory](https://www.jenkins.io/security/advisory/2014-10-30/).\n\nJenkins 2.319, LTS 2.303.3 addresses these security vulnerabilities.\n\nSECURITY-2541 / CVE-2021-21694: `FilePath#toURI`, `FilePath#hasSymlink`, `FilePath#absolutize`, `FilePath#isDescendant` check stat permission. `FilePath#get*DiskSpace` methods are no longer allowed to be executed by an agent.\n\nAs some common operations are now newly subject to access control, it is expected that plugins sending commands from agents to the controller may start failing. Additionally, the newly introduced path canonicalization means that instances using a custom builds directory ([Java system property jenkins.model.Jenkins.buildsDir](https://www.jenkins.io/doc/book/managing/system-properties/#jenkins-model-jenkins-buildsdir)) or partitioning `JENKINS_HOME` using symbolic links may fail access control checks. See [the documentation](https://www.jenkins.io/doc/book/security/controller-isolation/agent-to-controller/#file-access-rules) for how to customize the configuration in case of problems.\n\nIf you are unable to immediately upgrade to Jenkins 2.319, LTS 2.303.3, you can install the [Remoting Security Workaround Plugin](https://www.jenkins.io/redirect/remoting-security-workaround/). It will prevent all agent-to-controller file access using `FilePath` APIs. Because it is more restrictive than Jenkins 2.319, LTS 2.303.3, more plugins are incompatible with it. Make sure to read the plugin documentation before installing it.",
  "id": "GHSA-pgj6-jmj5-wqfx",
  "modified": "2022-12-16T20:40:24Z",
  "published": "2022-05-24T19:19:44Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-21694"
    },
    {
      "type": "WEB",
      "url": "https://github.com/jenkinsci/jenkins/commit/104c751d907919dd53f5090f84d53c671a66457b"
    },
    {
      "type": "WEB",
      "url": "https://github.com/jenkinsci/jenkins/commit/5a245e42979abe4a26d41727c839521e36cedd74"
    },
    {
      "type": "WEB",
      "url": "https://github.com/jenkinsci/jenkins/commit/63cde2daadc705edf086f2213b48c8c547f98358"
    },
    {
      "type": "WEB",
      "url": "https://www.jenkins.io/security/advisory/2021-11-04/#SECURITY-2455"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Multiple vulnerabilities allow bypassing path filtering of agent-to-controller access control in Jenkins"
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




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.