CVE-2009-0779 in AIX
Summary
by MITRE
Buffer overflow in pppdial in IBM AIX 5.3 and 6.1 allows local users to gain privileges via a long "input string."
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Analysis
by VulDB Data Team • 08/28/2019
The vulnerability identified as CVE-2009-0779 represents a critical buffer overflow flaw within the pppdial component of IBM AIX operating systems version 5.3 and 6.1. This issue resides in the Point-to-Point Protocol daemon implementation that handles dialing operations, creating a potential pathway for privilege escalation attacks. The vulnerability specifically manifests when the system processes an excessively long input string during the pppdial execution process, leading to memory corruption that can be exploited by local attackers.
The technical nature of this buffer overflow stems from inadequate input validation within the pppdial utility's string handling mechanisms. When a local user provides an overly long input string, the program fails to properly bounds-check the data before copying it into a fixed-size buffer. This classic programming error allows the attacker to overwrite adjacent memory locations, potentially corrupting the stack frame or executable code segments. The vulnerability is classified under CWE-121 as a stack-based buffer overflow, which directly enables attackers to manipulate program execution flow through memory corruption.
From an operational perspective, this vulnerability presents a significant risk to IBM AIX systems as it requires only local user access to exploit, eliminating the need for network-based reconnaissance or complex remote attack vectors. Local privilege escalation capabilities mean that an attacker with basic user credentials can potentially elevate their privileges to root level access, thereby gaining complete control over the affected system. The impact extends beyond individual system compromise, as successful exploitation could enable attackers to establish persistent backdoors, access sensitive data, or use the compromised system as a launch point for further attacks within the network infrastructure.
The exploitation of this vulnerability aligns with several ATT&CK techniques including privilege escalation and execution through command and scripting interpreter. The attack surface is particularly concerning in enterprise environments where AIX systems may host critical business applications and sensitive data repositories. Organizations running these vulnerable versions of IBM AIX should prioritize immediate patching and implementation of additional security controls such as privilege separation, input validation enforcement, and monitoring for anomalous process behavior. System administrators should also consider implementing mandatory access controls and regular security audits to detect potential exploitation attempts and maintain overall system integrity.
Mitigation strategies should include applying the official IBM security patches that address the buffer overflow in pppdial, implementing input length restrictions within the application, and conducting thorough code reviews for similar vulnerabilities in other system components. Additionally, organizations should establish robust monitoring procedures to detect unusual string processing patterns and implement network segmentation to limit the potential impact of successful exploitation. The vulnerability serves as a reminder of the critical importance of input validation and proper memory management in system security, particularly in enterprise operating systems where privilege escalation risks can have severe consequences for overall organizational security posture.