CVE-2006-0736 in Linux Desktop
Summary
by MITRE
Stack-based buffer overflow in the pam_micasa PAM authentication module in CASA on Novell Linux Desktop 9 and Open Enterprise Server 1 allows remote attackers to execute arbitrary code via unspecified vectors.
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Analysis
by VulDB Data Team • 09/04/2019
The vulnerability identified as CVE-2006-0736 represents a critical stack-based buffer overflow within the pam_micasa Pluggable Authentication Module (PAM) component of the Central Authentication System (CASA) infrastructure. This flaw exists specifically within the Novell Linux Desktop 9 and Open Enterprise Server 1 platforms, where the PAM module responsible for authentication processing contains insufficient input validation mechanisms. The buffer overflow vulnerability occurs when the pam_micasa module processes authentication requests without adequate bounds checking on input data, creating an exploitable condition that can be leveraged by remote attackers to gain unauthorized system access.
The technical implementation of this vulnerability stems from improper memory management within the PAM authentication framework, where the pam_micasa module fails to validate the length of incoming data before copying it into fixed-size stack buffers. This classic buffer overflow condition allows attackers to overwrite adjacent memory locations including return addresses and control data, potentially enabling arbitrary code execution with elevated privileges. The vulnerability is classified under CWE-121 Stack-based Buffer Overflow, which specifically addresses buffer overflows occurring in stack memory regions where insufficient bounds checking permits data to overwrite adjacent memory locations. The attack vector is particularly concerning as it operates over remote network connections, eliminating the need for local system access and allowing exploitation from external networks.
The operational impact of this vulnerability extends beyond simple privilege escalation, as successful exploitation could lead to complete system compromise and unauthorized access to sensitive corporate data. Organizations relying on Novell Linux Desktop 9 and Open Enterprise Server 1 platforms face significant risk exposure, particularly in environments where these systems handle authentication for critical business applications and services. The vulnerability's remote exploitability means that attackers can target these systems from anywhere on the network without requiring physical access or prior system compromise, making it an attractive target for automated exploitation campaigns. This threat landscape aligns with ATT&CK technique T1548.003 Lateral Tool Transfer, as compromised systems could serve as launch points for further network infiltration.
Mitigation strategies for this vulnerability require immediate patch application from Novell, addressing the buffer overflow condition through proper input validation and memory boundary checks. System administrators should implement network segmentation and access controls to limit exposure of affected systems, while also monitoring for suspicious authentication attempts and network traffic patterns that may indicate exploitation attempts. The remediation process should include comprehensive vulnerability assessment across all Novell Linux Desktop 9 and Open Enterprise Server 1 installations to identify and isolate potentially compromised systems. Additionally, organizations should consider implementing intrusion detection systems to monitor for exploitation attempts targeting this specific vulnerability, as the attack patterns associated with stack-based buffer overflows typically exhibit characteristic network signatures that can be detected through proper monitoring protocols.