Jenkins Security Advisory 2022-06-22

Multiple cross-site scripting (XSS) vulnerabilities in Jenkins 2.355 and earlier, LTS 2.332.3 and earlier allow attackers to inject HTML and JavaScript into the Jenkins UI:

These vulnerabilities are known to be exploitable by attackers with Job/Configure permission.

Jenkins 2.356, LTS 2.332.4 and LTS 2.346.1 addresses these vulnerabilities:

In Jenkins 2.355 and earlier, LTS 2.332.3 and earlier, an observable timing discrepancy on the login form allows distinguishing between login attempts with an invalid username, and login attempts with a valid username and wrong password, when using the Jenkins user database security realm. This allows attackers to determine the validity of attacker-specified usernames.

Login attempts with an invalid username now validate a synthetic password to eliminate the timing discrepancy in Jenkins 2.356, LTS 2.332.4.

Jenkins uses the Stapler web framework to render its UI views. These views are frequently composed of several view fragments, enabling plugins to extend existing views with more content.

Before SECURITY-534 was fixed in Jenkins 2.186 and LTS 2.176.2, attackers could in some cases directly access a view fragment containing sensitive information, bypassing any permission checks in the corresponding view.

In Jenkins 2.335 through 2.355 (both inclusive), the protection added for SECURITY-534 is disabled for some views. As a result, attackers could in very limited cases directly access a view fragment containing sensitive information, bypassing any permission checks in the corresponding view.

Jenkins 2.356 restores the protection for affected views.

JUnit Plugin 1119.va_a_5e9068da_d7 and earlier does not escape descriptions of test results.

This results in a stored cross-site scripting (XSS) vulnerability exploitable by attackers with Run/Update permission.

JUnit Plugin 1119.1121.vc43d0fc45561 applies the configured markup formatter to descriptions of test results.

Pipeline: Input Step Plugin 448.v37cea_9a_10a_70 and earlier allows Pipeline authors to specify file parameters for Pipeline input steps even though they are unsupported. Although the uploaded file is not copied to the workspace, Jenkins archives the file on the controller as part of build metadata using the parameter name without sanitization as a relative path inside a build-related directory.

This allows attackers able to configure Pipelines to create or replace arbitrary files on the Jenkins controller file system with attacker-specified content.

Pipeline: Input Step Plugin 449.v77f0e8b_845c4 prohibits use of file parameters for Pipeline input steps. Attempts to use them will fail Pipeline execution.

Embeddable Build Status Plugin 2.0.3 allows specifying a link query parameter that build status badges will link to, without restricting possible values.

This results in a reflected cross-site scripting (XSS) vulnerability.

Embeddable Build Status Plugin 2.0.4 limits URLs to http and https protocols and correctly escapes the provided value.

Embeddable Build Status Plugin 2.0.3 and earlier allows specifying a style query parameter that is used to choose a different SVG image style without restricting possible values.

This results in a relative path traversal vulnerability, allowing attackers without Overall/Read permission to specify paths to other SVG images on the Jenkins controller file system.

Embeddable Build Status Plugin 2.0.4 restricts the style query parameter to one of the three legal values.

Embeddable Build Status Plugin 2.0.3 and earlier does not correctly perform the ViewStatus permission check in the HTTP endpoint it provides for "unprotected" status badge access.

This allows attackers without any permissions to obtain the build status badge icon for any attacker-specified job and/or build.

Embeddable Build Status Plugin 2.0.4 requires ViewStatus permission to obtain the build status badge icon.

xUnit Plugin 3.0.8 and earlier implements an agent-to-controller message that creates a user-specified directory if it doesn’t exist, and parsing files inside it as test results.

This allows attackers able to control agent processes to create an arbitrary directory on the Jenkins controller or to obtain test results from existing files in an attacker-specified directory.

xUnit Plugin 3.1.0 changes the message type from agent-to-controller to controller-to-agent, preventing execution on the controller.

Nested View Plugin 1.20 through 1.25 (both inclusive) does not escape search parameters.

This results in a reflected cross-site scripting (XSS) vulnerability.

Nested View Plugin 1.26 escapes search parameters.

Multiple plugins do not escape the name and description of the parameter types they provide:

This results in stored cross-site scripting (XSS) vulnerabilities exploitable by attackers with Item/Configure permission.

Exploitation of these vulnerabilities requires that parameters are listed on another page, like the "Build With Parameters" and "Parameters" pages provided by Jenkins (core), and that those pages are not hardened to prevent exploitation. Jenkins (core) has prevented exploitation of vulnerabilities of this kind on the "Build With Parameters" and "Parameters" pages since 2.44 and LTS 2.32.2 as part of the SECURITY-353 / CVE-2017-2601 fix. Additionally, several plugins have previously been updated to list parameters in a way that prevents exploitation by default, see SECURITY-2617 in the 2022-04-12 security advisory for a list.

The following plugins have been updated to escape the name and description of the parameter types they provide in the versions specified:

As of publication of this advisory, there is no fix available for the following plugins:

Convertigo Mobile Platform Plugin 1.1 and earlier stores passwords unencrypted in job config.xml files on the Jenkins controller as part of its configuration.

These passwords can be viewed by users with Item/Extended Read permission or access to the Jenkins controller file system.

As of publication of this advisory, there is no fix.

Convertigo Mobile Platform Plugin 1.1 and earlier does not perform a permission check in a method implementing form validation.

This allows attackers with Overall/Read permission to connect to an attacker-specified URL.

Additionally, this form validation method does not require POST requests, resulting in a cross-site request forgery (CSRF) vulnerability.

As of publication of this advisory, there is no fix.

EasyQA Plugin 1.0 and earlier stores user passwords unencrypted in its global configuration file EasyQAPluginProperties.xml on the Jenkins controller as part of its configuration.

These passwords can be viewed by users with access to the Jenkins controller file system.

As of publication of this advisory, there is no fix.

EasyQA Plugin 1.0 and earlier does not perform a permission check in a method implementing form validation.

This allows attackers with Overall/Read permission to connect to an attacker-specified HTTP server.

Additionally, this form validation method does not require POST requests, resulting in a cross-site request forgery (CSRF) vulnerability.

As of publication of this advisory, there is no fix.

Jianliao Notification Plugin 1.1 and earlier does not perform a permission check in a method implementing form validation.

This allows attackers with Overall/Read permission to send HTTP POST requests to an attacker-specified URL.

Additionally, this form validation method does not require POST requests, resulting in a cross-site request forgery (CSRF) vulnerability.

As of publication of this advisory, there is no fix.

Beaker builder Plugin 1.10 and earlier does not perform a permission check in a method implementing form validation.

This allows attackers with Overall/Read permission to connect to an attacker-specified URL.

Additionally, this form validation method does not require POST requests, resulting in a cross-site request forgery (CSRF) vulnerability.

As of publication of this advisory, there is no fix.

ThreadFix Plugin 1.5.4 and earlier does not perform a permission check in a method implementing form validation.

This allows attackers with Overall/Read permission to connect to an attacker-specified URL.

Additionally, this form validation method does not require POST requests, resulting in a cross-site request forgery (CSRF) vulnerability.

As of publication of this advisory, there is no fix.

vRealize Orchestrator Plugin 3.0 and earlier does not perform a permission check in an HTTP endpoint.

This allows attackers with Overall/Read permission to send an HTTP POST request to an attacker-specified URL.

Additionally, this HTTP endpoint does not require POST requests, resulting in a cross-site request forgery (CSRF) vulnerability.

As of publication of this advisory, there is no fix.

Squash TM Publisher (Squash4Jenkins) Plugin 1.0.0 and earlier stores passwords unencrypted in its global configuration file org.jenkinsci.squashtm.core.SquashTMPublisher.xml on the Jenkins controller as part of its configuration.

These passwords can be viewed by users with access to the Jenkins controller file system.

As of publication of this advisory, there is no fix.