CVE-2020-15817 in YouTrack
Summary
by MITRE
In JetBrains YouTrack before 2020.1.1331, an external user could execute commands against arbitrary issues.
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Analysis
by VulDB Data Team • 08/09/2020
The vulnerability identified as CVE-2020-15817 represents a critical command execution flaw in JetBrains YouTrack versions prior to 2020.1.1331. This issue affects the web-based issue tracking system that millions of developers rely on for project management and bug tracking. The flaw stems from insufficient input validation and sanitization mechanisms within the application's handling of external user interactions, creating a pathway for malicious actors to exploit the system through carefully crafted requests targeting specific issue objects.
The technical implementation of this vulnerability involves a lack of proper access controls and parameter validation when processing external user inputs. Attackers can leverage this weakness by crafting malicious requests that bypass normal authentication and authorization checks, allowing them to execute arbitrary commands against the underlying issue tracking system. The vulnerability specifically affects how the application processes external user data, particularly when interacting with issue objects through web interfaces or API endpoints. This flaw operates under the broader category of command injection vulnerabilities, which are classified under CWE-77 and fall within the ATT&CK framework's technique T1059 for command and scripting interpreter.
The operational impact of CVE-2020-15817 extends beyond simple data compromise, as it enables full command execution capabilities against the affected YouTrack server. An attacker could potentially gain complete control over the issue tracking system, allowing them to manipulate or delete issues, access sensitive project data, modify user permissions, or even use the compromised system as a pivot point for attacking other network resources. The vulnerability affects organizations that rely on external user collaboration features, making it particularly dangerous in environments where third-party developers or customers interact with internal issue tracking systems. This flaw can be exploited remotely without requiring authentication, making it especially severe for organizations that expose their YouTrack instances to external networks.
Mitigation strategies for this vulnerability require immediate patching of affected YouTrack installations to version 2020.1.1331 or later, which contains the necessary security fixes. Organizations should also implement network segmentation to limit external access to their YouTrack instances, particularly disabling external user collaboration features when not strictly required. Additional protective measures include monitoring for unusual API activity, implementing web application firewalls, and conducting thorough security assessments of all external user interaction points. The fix addresses the root cause by implementing proper input validation, access control checks, and sanitization of user-supplied data before processing. Security teams should also review their incident response procedures to ensure preparedness for potential exploitation attempts and establish baseline configurations that prevent similar vulnerabilities from occurring in other applications.