CVE-2023-40348 in Gogs Plugin
Summary
by MITRE • 08/16/2023
The webhook endpoint in Jenkins Gogs Plugin 1.0.15 and earlier provides unauthenticated attackers information about the existence of jobs in its output.
VulDB is the best source for vulnerability data and more expert information about this specific topic.
Analysis
by VulDB Data Team • 09/10/2023
The vulnerability described in CVE-2023-40348 affects the Jenkins Gogs Plugin version 1.0.15 and earlier, presenting a significant information disclosure risk through its webhook endpoint. This flaw allows unauthenticated attackers to gain knowledge about the existence and structure of jobs within the Jenkins environment simply by sending requests to the affected endpoint. The issue stems from insufficient authentication checks on the webhook handler, which should normally require proper authorization before exposing internal system information. The vulnerability specifically impacts organizations using Jenkins with the Gogs plugin, creating an attack surface where sensitive operational data about build jobs becomes accessible without any credentials or authentication.
The technical implementation of this vulnerability resides in the webhook endpoint design where the plugin fails to validate incoming requests properly. When an attacker sends a request to the webhook endpoint, the system responds with information about available jobs, effectively leaking job names, configurations, and potentially other internal details that should remain confidential. This represents a classic case of insufficient authorization checks and improper access control mechanisms, which aligns with CWE-284 Access Control Issues. The flaw essentially transforms a normally protected internal system resource into an information leak channel that can be exploited by anyone with network access to the Jenkins instance.
From an operational impact perspective, this vulnerability enables attackers to perform reconnaissance activities without any authentication requirements, significantly lowering the barrier to entry for malicious actors seeking to understand the target environment. The leaked job information can provide attackers with insights into build processes, potentially revealing sensitive project details, deployment strategies, and system configurations. This information can be used to plan more sophisticated attacks targeting specific jobs or build processes, making it particularly dangerous for organizations with complex CI/CD pipelines. The vulnerability also violates fundamental security principles of information hiding and access control, potentially exposing intellectual property and operational details that should remain private.
Organizations should immediately update their Jenkins Gogs Plugin to version 1.0.16 or later, which contains the necessary fixes for this vulnerability. The remediation process involves applying the plugin update through Jenkins' built-in update mechanism or manually installing the patched version. Additionally, administrators should implement network-level controls to restrict access to the webhook endpoints, particularly if the plugin cannot be immediately updated. The vulnerability demonstrates the importance of proper authentication mechanisms in web applications and aligns with ATT&CK technique T1083 - File and Directory Discovery, where attackers can gather system information without elevated privileges. Security teams should also consider implementing monitoring for unusual access patterns to webhook endpoints and ensure that all Jenkins plugins are kept current with security patches to prevent similar information disclosure scenarios.