Date: Wed, 29 Jan 2020 16:10:08 +0100 From: Daniel Beck <ml@...kweb.net> To: oss-security@...ts.openwall.com Subject: Multiple vulnerabilities in Jenkins and Jenkins plugins Jenkins is an open source automation server which enables developers around the world to reliably build, test, and deploy their software. The following releases contain fixes for security vulnerabilities: * Jenkins 2.219 * Jenkins LTS 2.204.2 * Code Coverage API Plugin 1.1.3 * Fortify Plugin 19.2.30 Additionally, we announce unresolved security issues in the following plugins: * WebSphere Deployer Plugin Summaries of the vulnerabilities are below. More details, severity, and attribution can be found here: https://jenkins.io/security/advisory/2020-01-29/ We provide advance notification for security updates on this mailing list: https://groups.google.com/d/forum/jenkinsci-advisories If you discover security vulnerabilities in Jenkins, please report them as described here: https://jenkins.io/security/#reporting-vulnerabilities --- SECURITY-1682 / CVE-2020-2099 Jenkins 2.213 and earlier, LTS 2.204.1 and earlier includes support for the Inbound TCP Agent Protocol/3 for communication between master and agents. While this protocol has been deprecated in 2018 and was recently removed from Jenkins in 2.214, it could still easily be enabled in Jenkins LTS 2.204.1, 2.213, and older. This protocol incorrectly reuses encryption parameters which allow an unauthenticated remote attacker to determine the connection secret. This secret can then be used to connect attacker-controlled Jenkins agents to the Jenkins master. SECURITY-1641 / CVE-2020-2100 Jenkins 2.218 and earlier, LTS 2.204.1 and earlier supports two network discovery services (UDP multicast/broadcast and DNS multicast) by default. The UDP multicast/broadcast service can be used in an amplification reflection attack, as very few bytes sent to the respective endpoint result in much larger responses: A single byte request to this service would respond with more than 100 bytes of Jenkins metadata which could be used in a DDoS attack on a Jenkins master. Within the same network, spoofed UDP packets could also be sent to make two Jenkins masters go into an infinite loop of replies to one another, thus causing a denial of service. SECURITY-1659 / CVE-2020-2101 Jenkins 2.218 and earlier, LTS 2.204.1 and earlier does not use a constant-time comparison validating the connection secret when an inbound TCP agent connection is initiated. This could potentially allow attackers to use statistical methods to obtain the connection secret. SECURITY-1660 / CVE-2020-2102 Jenkins 2.218 and earlier, LTS 2.204.1 and earlier does not use a constant-time comparison when checking whether two HMACs are equal. This could potentially allow attackers to use statistical methods to obtain a valid HMAC for an attacker-controlled input value. SECURITY-1695 / CVE-2020-2103 Jenkins shows various technical details about the current user on the `/whoAmI` page. In a previous fix, the `Cookie` header value containing the HTTP session ID was redacted. However, user metadata shown on this page could also include the HTTP session ID in Jenkins 2.218 and earlier, LTS 2.204.1 and earlier. This allows attackers able to exploit a cross-site scripting vulnerability to obtain the HTTP session ID value from this page. SECURITY-1650 / CVE-2020-2104 Jenkins includes a feature that shows a JVM memory usage chart for the Jenkins master. Access to the chart in Jenkins 2.218 and earlier, LTS 2.204.1 and earlier requires no permissions beyond the general Overall/Read, allowing users who are not administrators to view JVM memory usage data. SECURITY-1704 / CVE-2020-2105 Jenkins 2.218 and earlier, LTS 2.204.1 and earlier does not serve the `X-Frame-Options: deny` HTTP header on REST API responses to protect against clickjacking attacks. An attacker could exploit this by routing the victim through a specially crafted web page that embeds a REST API endpoint in an iframe and tricking the user into performing an action which would allow for the attacker to learn the content of that REST API endpoint. SECURITY-1680 / CVE-2020-2106 Code Coverage API Plugin 1.1.2 and earlier does not escape the filename of the coverage report used in its view. This results in a stored cross-site scripting vulnerability that can be exploited by users able to change the job configuration. SECURITY-1565 / CVE-2020-2107 Fortify Plugin 19.1.29 and earlier stored its proxy server password unencrypted in job `config.xml` files. This password could be read by users with the Extended Read permission. SECURITY-1719 / CVE-2020-2108 WebSphere Deployer Plugin 1.6.1 and earlier does not configure the XML parser to prevent XML external entity (XXE) attacks. This could be exploited by a user with Job/Configure permissions to upload a specially crafted war file containing a `WEB-INF/ibm-web-ext.xml` which is parsed by the plugin. As of publication of this advisory, there is no fix.
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