CVE-2003-0697 in AIX
Summary
by MITRE
Format string vulnerability in lpd in the bos.rte.printers fileset for AIX 4.3 through 5.2, with debug enabled, allows local users to cause a denial of service (crash) or gain root privileges.
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Analysis
by VulDB Data Team • 03/08/2021
The vulnerability described in CVE-2003-0697 represents a critical format string flaw within the line printer daemon lpd component of IBM AIX operating systems. This issue specifically affects the bos.rte.printers fileset and manifests when debug functionality is enabled, creating a pathway for malicious exploitation that can result in either system crashes or privilege escalation. The lpd service, which handles print job processing and queue management, becomes a vector for attackers to manipulate memory structures through improper handling of format strings. This vulnerability operates at the core of system security infrastructure, as print services are often running with elevated privileges to manage printer access and job processing.
The technical mechanism behind this flaw involves the improper use of user-supplied input in format string functions without proper validation or sanitization. When debug mode is active, the lpd daemon processes print requests that contain format specifiers which are then passed directly to functions like printf or sprintf without adequate protection. Attackers can craft malicious print jobs containing format string specifiers that overwrite memory locations, potentially leading to arbitrary code execution or system termination. The vulnerability stems from CWE-134, which specifically addresses format string vulnerabilities where format strings are constructed from user inputs, and aligns with ATT&CK technique T1068 which covers the exploitation of system privileges through local attacks.
The operational impact of this vulnerability extends beyond simple denial of service scenarios, as it provides local attackers with the capability to escalate privileges to root level access. This privilege escalation occurs because the lpd service typically runs with elevated permissions to manage printer resources and access system files. Successful exploitation can result in complete system compromise, allowing attackers to execute arbitrary commands, modify system configurations, or establish persistent access. The vulnerability affects AIX versions 4.3 through 5.2, representing a significant security gap in IBM's print service implementation that could be exploited by attackers with local access to the system. Organizations running these affected versions face potential exposure to both denial of service attacks and privilege escalation attempts, making this vulnerability particularly dangerous in environments where local system access might be compromised.
Mitigation strategies for CVE-2003-0697 should focus on immediate remediation through patching the affected bos.rte.printers fileset or disabling debug functionality in the lpd service. System administrators should disable debug mode in the lpd configuration and ensure that print services are not running with unnecessary elevated privileges. Additionally, implementing proper input validation and sanitization for all format string operations within the lpd service would prevent exploitation. Network segmentation and access controls should be enforced to limit local system access, while regular security audits should verify that debug features are disabled in production environments. The vulnerability highlights the importance of following secure coding practices as outlined in CWE guidelines and demonstrates how seemingly minor configuration options can create significant security risks. Organizations should also consider implementing intrusion detection systems to monitor for suspicious print job patterns that might indicate exploitation attempts, and maintain updated security patches to address similar vulnerabilities in other system components.