ghsa-c5r9-rx53-q3gf
Vulnerability from github
Jenkins 2.318 and earlier, LTS 2.303.2 and earlier does not limit agent read/write access to the libs/
directory inside build directories when using the FilePath
APIs. This directory is used by the Pipeline: Shared Groovy Libraries Plugin to store copies of shared libraries.
This allows attackers in control of agent processes to replace the code of a trusted library with a modified variant, resulting in unsandboxed code execution in the Jenkins controller process.
Jenkins 2.319, LTS 2.303.3 prohibits agent read/write access to the libs/
directory inside build directories.
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.
It is not easily possible to customize the file access rules to prohibit access to the libs/
directory specifically, as built-in rules (granting access to <BUILDDIR>
contents) would take precedence over a custom rule prohibiting access.
{ "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-2021-21696" ], "database_specific": { "cwe_ids": [ "CWE-693" ], "github_reviewed": true, "github_reviewed_at": "2022-06-23T06:47:00Z", "nvd_published_at": "2021-11-04T17:15:00Z", "severity": "HIGH" }, "details": "Jenkins 2.318 and earlier, LTS 2.303.2 and earlier does not limit agent read/write access to the `libs/` directory inside build directories when using the `FilePath` APIs. This directory is used by the Pipeline: Shared Groovy Libraries Plugin to store copies of shared libraries.\n\nThis allows attackers in control of agent processes to replace the code of a trusted library with a modified variant, resulting in unsandboxed code execution in the Jenkins controller process.\n\nJenkins 2.319, LTS 2.303.3 prohibits agent read/write access to the `libs/` directory inside build directories.\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.\n\nIt is not easily possible to [customize the file access rules](https://www.jenkins.io/doc/book/security/controller-isolation/agent-to-controller/#file-access-rules) to prohibit access to the `libs/` directory specifically, as built-in rules (granting access to `\u003cBUILDDIR\u003e` contents) would take precedence over a custom rule prohibiting access.", "id": "GHSA-c5r9-rx53-q3gf", "modified": "2022-12-16T20:43:58Z", "published": "2022-05-24T19:19:43Z", "references": [ { "type": "ADVISORY", "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-21696" }, { "type": "WEB", "url": "https://github.com/jenkinsci/jenkins/commit/93451e20c20cfd84badeb0f37c38d4c0c7a5dad3" }, { "type": "PACKAGE", "url": "https://github.com/jenkinsci/jenkins" }, { "type": "WEB", "url": "https://www.jenkins.io/security/advisory/2021-11-04/#SECURITY-2423" }, { "type": "WEB", "url": "http://www.openwall.com/lists/oss-security/2021/11/04/3" } ], "schema_version": "1.4.0", "severity": [ { "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "type": "CVSS_V3" } ], "summary": "Agent-to-controller access control allowed writing to sensitive directory used by Jenkins Pipeline: Shared Groovy Libraries Plugin" }
Sightings
Author | Source | Type | Date |
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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.