CloudBees Security Advisory 2022-06-22

This advisory announces vulnerabilities in CloudBees CI, CloudBees Jenkins Platform and Jenkins

Encrypt JGroups HA network messages

BEE-16793

Before this fix the communication between HA nodes regarding the election of the primary node was not encrypted.

With this fix all the underlying JGroups communication is encrypted.

Upgrade notes:

The keystore used for encryption is automatically generated on startup, so there is a risk of multiple HA nodes trying to create the file at the same time if they are all restarted together.To avoid this, restart one of the HA nodes (any node is acceptable) and then restart the others.
If a custom `jgroups.xml` file is in use, then the following snippet can be added to it to get message encryption:
<SYM_ENCRYPT sym_algorithm="AES" keystore_name="${JENKINS_HOME}/jgroups_sym_encrypt.keystore" store_password="changeit" alias="jgroupsKey" />

Multiple XSS vulnerabilities

SECURITY-2781 / CVE-2022-34170 (SECURITY-2779), CVE-2022-34171 (SECURITY-2761), CVE-2022-34172 (SECURITY-2776), CVE-2022-34173 (SECURITY-2780)

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:

SECURITY-2779 (CVE-2022-34170): Since Jenkins 2.320 and LTS 2.332.1, help icon tooltips no longer escape the feature name, effectively undoing the fix for SECURITY-1955.
SECURITY-2761 (CVE-2022-34171): Since Jenkins 2.321 and LTS 2.332.1, the HTML output generated for new symbol-based SVG icons includes the title attribute of l:ionicon until Jenkins 2.334 and alt attribute of l:icon since Jenkins 2.335 without further escaping.
SECURITY-2776 (CVE-2022-34172): Since Jenkins 2.340, symbol-based icons unescape previously escaped values of tooltip parameters.
SECURITY-2780 (CVE-2022-34173): Since Jenkins 2.340, the tooltip of the build button in list views supports HTML without escaping the job display name.

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:

SECURITY-2779: The feature name in help icon tooltips is now escaped.
SECURITY-2761: The title attribute of l:ionicon (Jenkins LTS 2.332.4) and alt attribute of l:icon (Jenkins 2.356 and LTS 2.346.1) are escaped in the generated HTML output.
SECURITY-2776: Symbol-based icons no longer unescape values of tooltip parameters.
SECURITY-2780: The tooltip of the build button in list views is now escaped.

Note: No Jenkins LTS release is affected by SECURITY-2776 or SECURITY-2780, as these were not present in Jenkins 2.332.x and fixed in the 2.346.x line before 2.346.1.

Observable timing discrepancy allows determining username validity

SECURITY-2566 / CVE-2022-34174

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.

Unauthorized view fragment access

SECURITY-2777 / CVE-2022-34175

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.

Note: As of publication, the Jenkins security team is unaware of any vulnerable view fragment across the Jenkins plugin ecosystem.

Jenkins 2.356 restores the protection for affected views.

Stored XSS vulnerability in JUnit Plugin

SECURITY-2760 / CVE-2022-34176

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.

Arbitrary file write vulnerability in Pipeline: Input Step Plugin

SECURITY-2705 / CVE-2022-34177

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.

Reflected XSS vulnerability in Embeddable Build Status Plugin

SECURITY-2567 / CVE-2022-34178

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.

Path traversal vulnerability in Embeddable Build Status Plugin

SECURITY-2792 / CVE-2022-34179

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.

Improper authorization in Embeddable Build Status Plugin bypasses ViewStatus permission requirement

SECURITY-2794 / CVE-2022-34180

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.

Agent-to-controller security bypass in xUnit Plugin

SECURITY-2549 / CVE-2022-34181

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.

Reflected XSS vulnerability in Nested View Plugin

SECURITY-2768 / CVE-2022-34182

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.

Stored XSS vulnerabilities in multiple plugins providing additional parameter types

SECURITY-2784 / CVE-2022-34183 (Agent Server Parameter), CVE-2022-34184 (CRX Content Package Deployer), CVE-2022-34185 (Date Parameter), CVE-2022-34186 (Dynamic Extended Choice Parameter), CVE-2022-34187 (Filesystem List Parameter), CVE-2022-34188 (Hidden Parameter), CVE-2022-34189 (Image Tag Parameter), CVE-2022-34190 (Maven Metadata for CI server), CVE-2022-34191 (NS-ND Integration Performance Publisher), CVE-2022-34192 (ontrack Jenkins), CVE-2022-34193 (Package Version), CVE-2022-34194 (Readonly Parameter), CVE-2022-34195 (Repository Connector), CVE-2022-34196 (REST List Parameter), CVE-2022-34197 (Sauce OnDemand), CVE-2022-34198 (Stash Branch Parameter)

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

Agent Server Parameter 1.1 and earlier (SECURITY-2731 / CVE-2022-34183)
CRX Content Package Deployer 1.9 and earlier (SECURITY-2727 / CVE-2022-34184)
Date Parameter Plugin 0.0.4 and earlier (SECURITY-2711 / CVE-2022-34185)
Dynamic Extended Choice Parameter 1.0.1 and earlier (SECURITY-2712 / CVE-2022-34186)
Filesystem List Parameter 0.0.7 and earlier (SECURITY-2716 / CVE-2022-34187)
Hidden Parameter Plugin 0.0.4 and earlier (SECURITY-2755 / CVE-2022-34188)
Image Tag Parameter 1.10 and earlier (SECURITY-2721 / CVE-2022-34189)
Maven Metadata for CI server 2.1 and earlier (SECURITY-2714 / CVE-2022-34190)
NS-ND Integration Performance Publisher 4.8.0.77 and earlier (SECURITY-2736 / CVE-2022-34191)
ontrack Jenkins 4.0.0 and earlier (SECURITY-2733 / CVE-2022-34192)
Package Version 1.0.1 and earlier (SECURITY-2735 / CVE-2022-34193)
Readonly Parameter 1.0.0 and earlier (SECURITY-2719 / CVE-2022-34194)
Repository Connector 2.2.0 and earlier (SECURITY-2666 / CVE-2022-34195)
REST List Parameter Plugin 1.5.2 and earlier (SECURITY-2730 / CVE-2022-34196)
Sauce OnDemand 1.204 and earlier (SECURITY-2724 / CVE-2022-34197)
Stash Branch Parameter 0.3.0 and earlier (SECURITY-2725 / CVE-2022-34198)

This results in stored cross-site scripting (XSS) vulnerabilites 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:

REST List Parameter Plugin 1.6.0
Hidden Parameter Plugin 0.0.5

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

Agent Server Parameter 1.1 and earlier (SECURITY-2731 / CVE-2022-34183)
CRX Content Package Deployer 1.9 and earlier (SECURITY-2727 / CVE-2022-34184)
Date Parameter Plugin 0.0.4 and earlier (SECURITY-2711 / CVE-2022-34185)
Dynamic Extended Choice Parameter 1.0.1 and earlier (SECURITY-2712 / CVE-2022-34186)
Filesystem List Parameter 0.0.7 and earlier (SECURITY-2716 / CVE-2022-34187)
Image Tag Parameter 1.10 and earlier (SECURITY-2721 / CVE-2022-34189)
Maven Metadata for CI server 2.1 and earlier (SECURITY-2714 / CVE-2022-34190)
NS-ND Integration Performance Publisher 4.8.0.77 and earlier (SECURITY-2736 / CVE-2022-34191)
ontrack Jenkins 4.0.0 and earlier (SECURITY-2733 / CVE-2022-34192)
Package Version 1.0.1 and earlier (SECURITY-2735 / CVE-2022-34193)
Readonly Parameter 1.0.0 and earlier (SECURITY-2719 / CVE-2022-34194)
Repository Connector 2.2.0 and earlier (SECURITY-2666 / CVE-2022-34195)
Sauce OnDemand 1.204 and earlier (SECURITY-2724 / CVE-2022-34197)
Stash Branch Parameter 0.3.0 and earlier (SECURITY-2725 / CVE-2022-34198)

Passwords stored in plain text by Convertigo Mobile Platform Plugin

SECURITY-2064 / CVE-2022-34199

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.