CVE-2013-0454 in Samba
Summary
by MITRE
The SMB2 implementation in Samba 3.6.x before 3.6.6, as used on the IBM Storwize V7000 Unified 1.3 before 1.3.2.3 and 1.4 before 1.4.0.1 and possibly other products, does not properly enforce CIFS share attributes, which allows remote authenticated users to (1) write to a read-only share; (2) trigger data-integrity problems related to the oplock, locking, coherency, or leases attribute; or (3) have an unspecified impact by leveraging incorrect handling of the browseable or "hide unreadable" parameter.
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Analysis
by VulDB Data Team • 12/28/2024
The vulnerability identified as CVE-2013-0454 represents a critical flaw in the Server Message Block version 2 implementation within Samba software, specifically affecting versions 3.6.x prior to 3.6.6. This issue manifests in IBM Storwize V7000 Unified storage systems running affected Samba versions, where the implementation fails to properly enforce CIFS share attributes that are fundamental to network file sharing security. The flaw exists in the core protocol handling mechanism that governs how file shares are accessed and managed across networked storage environments, creating a significant security gap that undermines the integrity of shared file systems.
The technical root cause of this vulnerability lies in the improper enforcement of CIFS share attributes within the SMB2 protocol implementation. When users authenticate to network shares through the affected Samba versions, the system fails to correctly validate and enforce the read-only permissions that should be applied to specific shares. This misconfiguration allows authenticated remote attackers to bypass intended access controls and perform write operations on shares that should only be accessible for reading. The vulnerability extends beyond simple permission bypass to include critical data integrity issues related to oplock (opportunistic locking) handling, file locking mechanisms, coherency protocols, and lease management, all of which are essential for maintaining consistent file access across distributed storage systems.
The operational impact of CVE-2013-0454 is substantial and multifaceted, affecting both data integrity and system availability within enterprise storage environments. Remote authenticated users can exploit this vulnerability to modify data within read-only shares, potentially leading to unauthorized data corruption or manipulation of critical business information. The oplock and locking issues create potential for data coherency problems that can result in file corruption, inconsistent data states, and potential system crashes when multiple clients attempt to access the same files simultaneously. Additionally, the incorrect handling of browseable and "hide unreadable" parameters can expose sensitive directory structures and file information to unauthorized users, creating information disclosure vulnerabilities that may reveal organizational data patterns and file hierarchies.
From a cybersecurity perspective, this vulnerability maps directly to CWE-284 (Improper Access Control) and CWE-120 (Buffer Overflow) categories, representing a failure in access control enforcement and potential for data integrity compromise. The attack surface is particularly concerning given that the vulnerability affects storage systems where data integrity is paramount, making it a prime target for attackers seeking to manipulate critical business data. The impact aligns with ATT&CK technique T1074.001 (Data Staged) and T1566.002 (Phishing: Spearphishing Attachment), as the vulnerability could be exploited through authenticated network access to stage malicious data or gain unauthorized access to sensitive storage resources. Organizations using affected IBM Storwize systems face potential data loss, regulatory compliance violations, and operational disruption that could affect business continuity and customer trust.
The recommended mitigations for CVE-2013-0454 include immediate patching of Samba implementations to versions 3.6.6 or later, where the vulnerability has been addressed through proper enforcement of CIFS share attributes. System administrators should also implement network segmentation and access controls to limit authenticated user access to only necessary shares, while monitoring for unauthorized write attempts on read-only shares. Additionally, organizations should review and validate their existing share permissions and access control lists to ensure that proper segregation of duties is maintained. Regular vulnerability assessments and security audits of storage infrastructure are essential to identify similar implementation flaws that may exist in other network services or protocols, ensuring comprehensive protection against similar vulnerabilities that could compromise data integrity and system security.