CVE-2012-4109 in Unified Computing System
Summary
by MITRE
The clear sshkey command in the fabric-interconnect component in Cisco Unified Computing System (UCS) allows local users to gain privileges by embedding commands in an unspecified parameter, aka Bug ID CSCtq86559.
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Analysis
by VulDB Data Team • 03/01/2019
The vulnerability identified as CVE-2012-4109 resides within the fabric-interconnect component of Cisco Unified Computing System UCS, specifically affecting the clear sshkey command functionality. This issue represents a privilege escalation vulnerability that enables local attackers to execute arbitrary commands through manipulation of an unspecified parameter within the sshkey clearing mechanism. The vulnerability stems from inadequate input validation and sanitization within the command processing pipeline, creating a potential vector for malicious code execution with elevated privileges.
The technical flaw manifests when local users exploit the clear sshkey command by embedding malicious commands within an unspecified parameter, which then gets processed without proper sanitization. This vulnerability operates under CWE-77 and CWE-78 categories, representing command injection flaws that allow attackers to execute arbitrary commands on the system. The underlying issue involves insufficient validation of user-supplied input, allowing crafted payloads to bypass normal security controls and execute with the privileges of the affected service or user. The vulnerability is particularly concerning because it operates at the local user level, meaning an attacker who has already gained access to a system can escalate their privileges further.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it can enable attackers to execute arbitrary code with elevated privileges, potentially compromising the entire fabric-interconnect component. This component serves as a critical management interface for UCS systems, making it a prime target for attackers seeking persistent access or system compromise. The vulnerability affects the integrity and confidentiality of the entire UCS infrastructure, as successful exploitation could lead to unauthorized access to network configurations, user credentials, and system management functions. Attackers could leverage this vulnerability to establish backdoors, modify system configurations, or exfiltrate sensitive data from the unified computing environment.
Mitigation strategies for CVE-2012-4109 should focus on implementing proper input validation and sanitization within the fabric-interconnect component's command processing functions. Cisco recommends applying the latest security patches and updates to address the vulnerability, while network administrators should implement least privilege principles to limit local user access to system components. The vulnerability aligns with ATT&CK technique T1068, which covers privilege escalation through local commands, and T1059, covering command and scripting interpreters. Organizations should also consider implementing monitoring solutions to detect anomalous command execution patterns and establish robust access controls to prevent unauthorized local system access. Regular security assessments and vulnerability scanning should be conducted to identify similar issues within the UCS infrastructure and ensure comprehensive protection against command injection attacks.