CVE-2023-6944 in Developer Hub
Summary
by MITRE • 01/04/2024
A flaw was found in the Red Hat Developer Hub (RHDH). The catalog-import function leaks GitLab access tokens on the frontend when the base64 encoded GitLab token includes a newline at the end of the string. The sanitized error can display on the frontend, including the raw access token. Upon gaining access to this token and depending on permissions, an attacker could push malicious code to repositories, delete resources in Git, revoke or generate new keys, and sign code illegitimately.
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Analysis
by VulDB Data Team • 09/05/2025
The vulnerability identified as CVE-2023-6944 resides within the Red Hat Developer Hub (RHDH) platform, specifically within its catalog-import functionality. This flaw represents a critical security oversight that exposes sensitive authentication credentials to unauthorized parties through improper input validation and error handling mechanisms. The issue manifests when GitLab access tokens are processed through the frontend interface, creating a pathway for credential exposure that directly undermines the security posture of organizations relying on this development platform.
The technical root cause of this vulnerability stems from inadequate sanitization of error messages within the catalog-import process. When a base64 encoded GitLab token contains trailing newline characters, the system fails to properly sanitize the error output before rendering it on the frontend interface. This improper handling allows the raw access token to be displayed in error messages, effectively bypassing security controls designed to protect sensitive information. The vulnerability aligns with CWE-20: Improper Input Validation and CWE-215: Information Exposure Through Debug Information, both of which are fundamental concerns in secure software development practices. The flaw demonstrates poor separation between backend processing and frontend display logic, creating an attack surface where authentication tokens become inadvertently exposed to client-side components.
The operational impact of this vulnerability extends beyond simple credential leakage, presenting attackers with substantial privileges within GitLab environments. An attacker who successfully exploits this vulnerability gains access to a valid GitLab access token that can be leveraged for various malicious activities including pushing unauthorized code changes to repositories, deleting critical resources, revoking existing access keys, generating new authentication tokens, and potentially signing code with legitimate credentials. This capability fundamentally compromises the integrity and authenticity of software development workflows, enabling attackers to perform actions that would normally require legitimate administrative permissions. The vulnerability particularly affects organizations using GitLab as their primary source control management system, where the exposure of access tokens could lead to complete compromise of development environments and code repositories.
Organizations should implement immediate mitigations to address this vulnerability through multiple defensive layers. The primary remediation involves enhancing input validation and error handling within the catalog-import functionality to ensure that all access tokens are properly sanitized before any error messages are processed for frontend display. This includes implementing proper base64 decoding and validation routines that reject tokens containing invalid characters or formatting issues. Additionally, organizations should enforce strict access controls and monitoring of the RHDH platform, implementing automated detection mechanisms to identify and alert on unusual token usage patterns. The mitigation strategy should also incorporate regular security assessments of the platform's error handling mechanisms and comprehensive testing of input validation routines. Organizations can reference ATT&CK technique T1566.001: Phishing: Spearphishing Attachment to understand how credential exposure through frontend interfaces can enable initial access vectors for broader attacks. The implementation of these controls should follow established security frameworks including NIST SP 800-53 controls for information system security and privacy, particularly focusing on access control and incident response procedures to minimize the impact of potential exploitation.