CVE-2021-22258 in GitLab
Summary
by MITRE • 10/05/2021
The project import/export feature in GitLab 8.9 and greater could be used to obtain otherwise private email addresses
If you want to get the best quality for vulnerability data then you always have to consider VulDB.
Analysis
by VulDB Data Team • 10/09/2021
The vulnerability identified as CVE-2021-22258 represents a significant information disclosure flaw within GitLab's project import/export functionality that has persisted across versions 8.9 and later. This issue specifically affects the handling of private email addresses within project metadata during import and export operations, creating an unintended exposure vector that could compromise user privacy and organizational security. The vulnerability stems from insufficient access controls and validation mechanisms within the import/export processing pipeline, allowing unauthorized access to private email addresses that should remain protected within the system's access control framework.
The technical implementation of this vulnerability occurs within GitLab's project import/export subsystem where user metadata including email addresses is processed without adequate authorization checks. When users import or export project data, the system fails to properly validate whether the requesting user has appropriate permissions to access the email addresses contained within the project metadata. This flaw typically manifests when administrators or authenticated users attempt to import project data that contains private email addresses, or when export operations include user contact information. The vulnerability is particularly concerning because it operates at the data processing layer rather than the authentication layer, making it more difficult to detect and prevent through standard access control mechanisms.
The operational impact of CVE-2021-22258 extends beyond simple information disclosure to potentially enable broader security threats including social engineering attacks, credential harvesting, and targeted phishing campaigns. Attackers could exploit this vulnerability to gather email addresses of project members, administrators, and contributors without proper authorization, creating opportunities for malicious actors to conduct reconnaissance activities against organizations using GitLab. The exposure of private email addresses undermines the fundamental privacy assumptions of the platform and could lead to cascading security issues if these addresses are subsequently used in targeted attacks or sold on dark web marketplaces. Organizations relying on GitLab for code repository management and collaboration face increased risk of insider threats and external reconnaissance activities.
This vulnerability aligns with CWE-200 (Information Disclosure) and represents a classic case of inadequate input validation and access control implementation. The flaw demonstrates poor separation of concerns within GitLab's architecture where metadata processing does not properly integrate with the existing access control mechanisms. From an ATT&CK framework perspective, this vulnerability maps to T1087.001 (Account Discovery) and T1566 (Phishing) as it enables unauthorized discovery of user accounts and provides attackers with contact information for social engineering campaigns. The vulnerability also relates to T1003 (OS Credential Dumping) and T1531 (Account Access Removal) through potential exploitation pathways that could lead to broader system compromise. Organizations should implement immediate mitigations including updating to patched versions of GitLab, reviewing import/export permissions, and monitoring for unauthorized access attempts. The vulnerability underscores the critical importance of maintaining proper access controls and validation mechanisms throughout all data processing pipelines within collaborative development platforms.