CVE-2020-7913 in YouTrack
Summary
by MITRE
JetBrains YouTrack 2019.2 before 2019.2.59309 was vulnerable to XSS via an issue description.
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Analysis
by VulDB Data Team • 01/31/2020
JetBrains YouTrack is a web-based issue tracking and project management platform that enables teams to manage bugs, tasks, and features through a centralized system. The vulnerability CVE-2020-7913 affects version 2019.2 before 2019.2.59309 and represents a cross-site scripting vulnerability in the issue description field. This flaw allows authenticated users to inject malicious scripts that execute in the context of other users' browsers when they view affected issue descriptions. The vulnerability stems from insufficient input validation and output encoding mechanisms within the application's web interface, specifically when processing user-provided content in issue description fields. Attackers can leverage this weakness to execute arbitrary JavaScript code, potentially leading to session hijacking, credential theft, or redirection to malicious websites. The issue manifests when users create or modify issue descriptions containing malicious script payloads that bypass the application's security filters. This vulnerability falls under CWE-79 which categorizes cross-site scripting flaws as weaknesses in web applications that allow attackers to inject client-side scripts into web pages viewed by other users. The operational impact of this vulnerability extends beyond simple script execution, as it can enable more sophisticated attacks such as those targeting the ATT&CK technique T1059.007 for Command and Scripting Interpreter. An attacker could craft malicious issue descriptions that, when viewed by administrators or other privileged users, could steal session cookies or perform unauthorized actions within the YouTrack environment. The vulnerability affects the integrity and confidentiality of data within the system since it allows unauthorized access to information that should remain protected. Organizations using JetBrains YouTrack versions prior to 2019.2.59309 are at risk of having their issue tracking systems compromised, potentially leading to unauthorized access to sensitive project data, user credentials, or internal system information. The exploitation requires minimal privileges since the vulnerability affects authenticated users and does not require special permissions to craft malicious payloads. Users with access to create or modify issue descriptions can potentially introduce malicious code that affects other users who view these descriptions. The fix for this vulnerability involves implementing proper input sanitization and output encoding for all user-provided content, particularly in fields that are rendered in web browsers. JetBrains addressed this issue in version 2019.2.59309 by strengthening the validation mechanisms and ensuring that user input is properly escaped before being rendered in the web interface. Organizations should immediately upgrade to the patched version and implement additional security measures such as content security policies to mitigate the risk of exploitation. The vulnerability demonstrates the critical importance of proper input validation in web applications and highlights the need for comprehensive security testing throughout the software development lifecycle. Security teams should monitor for potential exploitation attempts and review access controls to ensure that only authorized users can create or modify issue descriptions, thereby reducing the attack surface for this particular vulnerability.