CVE-2023-32072 in Tuleap Community Edition
Summary
by MITRE • 05/30/2023
Tuleap is an open source tool for end to end traceability of application and system developments. Tuleap Community Edition prior to version 14.8.99.60 and Tuleap Enterprise edition prior to 14.8-3 and 14.7-7, the logs of the triggered Jenkins job URLs are not properly escaped. A malicious Git administrator can setup a malicious Jenkins hook to make a victim, also a Git administrator, execute uncontrolled code. Tuleap Community Edition 14.8.99.60, Tuleap Enterprise Edition 14.8-3, and Tuleap Enterprise Edition 14.7-7 contain a patch for this issue.
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Analysis
by VulDB Data Team • 05/30/2023
The vulnerability identified as CVE-2023-32072 affects Tuleap, an open source platform designed for end-to-end traceability in application and system development workflows. This security flaw exists in both Community Edition versions prior to 14.8.99.60 and Enterprise Edition versions prior to 14.8-3 and 14.7-7, representing a critical cross-site scripting and command injection risk within the platform's integration with Jenkins continuous integration systems. The vulnerability stems from improper escaping of log output from triggered Jenkins job URLs, creating a dangerous attack surface where malicious actors can manipulate system behavior through carefully crafted inputs.
The technical implementation of this vulnerability involves the insecure handling of user-controllable data within the logging mechanisms of Tuleap's Jenkins integration. When Jenkins hooks are triggered, the system logs contain unescaped URLs that can be manipulated by malicious actors to inject malicious payloads. This represents a classic case of insufficient output escaping or sanitization, which falls under CWE-79 - Improper Neutralization of Input During Web Page Generation. The flaw allows for arbitrary code execution when victims with Git administrator privileges interact with maliciously crafted Jenkins hook configurations, as the system fails to properly validate and sanitize the data before incorporating it into system logs or execution contexts.
The operational impact of this vulnerability extends beyond simple code injection, as it enables a sophisticated attack vector where a malicious Git administrator can set up a malicious Jenkins hook to compromise other Git administrators who subsequently interact with the system. This creates a privilege escalation scenario within the development environment where attackers can leverage their position to execute unauthorized code on the target system. The attack chain typically involves the malicious actor creating a Jenkins hook with specially crafted parameters that, when logged and subsequently processed by the vulnerable Tuleap system, trigger unintended execution paths. This vulnerability aligns with ATT&CK technique T1059.007 - Command and Scripting Interpreter: Python, as it enables execution of malicious code through the Jenkins integration, and T1203 - Exploitation for Client Execution, since the vulnerability targets the client-side processing of Jenkins logs within the Tuleap environment.
The patch implemented in Tuleap versions 14.8.99.60 for Community Edition and 14.8-3 and 14.7-7 for Enterprise Edition addresses this vulnerability through proper input sanitization and output escaping mechanisms. The fix ensures that all log output containing Jenkins job URLs undergoes appropriate escaping before being processed or displayed, preventing malicious payloads from being executed. This remediation follows established security principles for preventing command injection and cross-site scripting attacks, requiring that all user-controllable data be properly validated and sanitized before being incorporated into system outputs or execution contexts. Organizations utilizing Tuleap should immediately upgrade to the patched versions to protect against this exploitation vector, as the vulnerability represents a significant risk to development environments where Jenkins integrations are actively used for continuous integration and deployment processes.