CVE-2007-0978 in AIX
Summary
by MITRE
Buffer overflow in swcons in IBM AIX 5.3 allows local users to gain privileges via long input data.
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Analysis
by VulDB Data Team • 08/26/2019
The vulnerability identified as CVE-2007-0978 represents a critical buffer overflow flaw within the software console component of IBM AIX 5.3 operating system. This issue specifically affects the swcons module which handles console operations and input processing. The buffer overflow occurs when the system processes user input data that exceeds the allocated buffer space, creating an exploitable condition that can be leveraged by local attackers to escalate their privileges. The vulnerability exists in the kernel-level console handling mechanism, making it particularly dangerous as it operates at the core of system operations.
The technical implementation of this buffer overflow stems from inadequate input validation within the swcons module of AIX 5.3. When local users provide excessively long input data to console operations, the system fails to properly bounds-check the data before copying it into fixed-size buffers. This classic buffer overflow condition allows attackers to overwrite adjacent memory locations, potentially corrupting critical system data structures or injecting malicious code. The flaw resides in the software console subsystem that manages terminal input/output operations, making it accessible through normal user interaction with console interfaces. According to CWE standards, this vulnerability maps to CWE-121, which describes stack-based buffer overflow conditions that occur when insufficient bounds checking is performed.
The operational impact of CVE-2007-0978 is severe for systems running IBM AIX 5.3, as local attackers can exploit this condition to gain elevated privileges. Once successfully exploited, the vulnerability allows attackers to execute arbitrary code with the privileges of the target process, typically resulting in full system compromise. The attack vector requires local access to the system, meaning that an attacker must already have user-level access to the machine. However, the privilege escalation potential makes this vulnerability particularly dangerous for environments where local access might be obtained through various means such as legitimate user accounts, shared system access, or through other initial compromise vectors. This vulnerability directly maps to ATT&CK technique T1068, which covers privilege escalation through local exploits.
Mitigation strategies for this vulnerability include immediate application of IBM security patches and updates specifically designed to address the buffer overflow in the swcons module. System administrators should also implement strict input validation controls and monitor console operations for unusual input patterns. The recommended approach involves upgrading to patched versions of IBM AIX 5.3 or applying the relevant security fixes provided by IBM. Additionally, implementing proper access controls and limiting local user privileges can reduce the potential impact of such vulnerabilities. Organizations should also consider implementing intrusion detection systems that can identify suspicious console input patterns and monitor for exploitation attempts. Regular security assessments and vulnerability scanning should be conducted to identify similar buffer overflow conditions in other system components and ensure comprehensive protection against similar threats.