SB2018072609 - Multiple vulnerabilities in Jenkins
Published: July 26, 2018
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 7 secuirty vulnerabilities.
1) Cross-site scripting (CVE-ID: CVE-2018-1999005)
The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.
The vulnerability exists due to the build timeline widget shown on URLs like /view/…/builds did not properly escape display names of items. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in user's browser in context of vulnerable website.
Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.
2) Cross-site scripting (CVE-ID: CVE-2018-1999007)
The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.
The vulnerability exists due to the build timeline widget shown on URLs like /view/…/builds did not properly escape display names of items. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in user's browser in context of vulnerable website.
Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.
3) Information disclosure (CVE-ID: CVE-2018-1999006)
The disclosed vulnerability allows a remote attacker to obtain potentially sensitive information.
The vulnerability exists due to exposure of sensitive information in Plugin.jav. A remote attacker can determine the date and time when a plugin HPI/JPI file was last extracted, which typically is the date of the most recent installation/upgrade.
4) Unauthorized modification of configuration (CVE-ID: CVE-2018-1999001)
The vulnerability allows a remote attacker to bypass security restrictions.
The vulnerability exists due to unauthorized modification of configuration in User.java. A remote attacker can provide crafted login credentials and cause Jenkins to move the config.xml file from the Jenkins home directory. If Jenkins is started without this file present, it will revert to the legacy defaults of granting administrator access to anonymous users.
5) Arbitrary file read (CVE-ID: CVE-2018-1999002)
The disclosed vulnerability allows a remote attacker to obtain potentially sensitive information.
The vulnerability exists due to arbitrary file read in the Stapler web framework's org/kohsuke/stapler/Stapler.java. A remote attacker can send specially crafted HTTP requests and return the contents of any file on the Jenkins master file system that the Jenkins master has access to.
6) Improper authorization (CVE-ID: CVE-2018-1999003)
The vulnerability allows a remote attacker to bypass authorization.
The vulnerability exists due to improper authorization in Queue.java. A remote attacker with Overall/Read permission can bypass authorization and cancel queued builds.
7) Improper authorization (CVE-ID: CVE-2018-1999004)
The vulnerability allows a remote attacker to bypass authorization.
The vulnerability exists due to improper authorization in SlaveComputer.java. A remote attacker with Overall/Read permission can bypass authorization to initiate agent launches, and abort in-progress agent launches.
Remediation
Install update from vendor's website.