CVE-1999-1552 in AIX
Summary
by MITRE
dpsexec (DPS Server) when running under XDM in IBM AIX 3.2.5 and earlier does not properly check privileges, which allows local users to overwrite arbitrary files and gain privileges.
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Analysis
by VulDB Data Team • 04/16/2026
The vulnerability identified as CVE-1999-1552 affects the dpsexec component of IBM AIX systems running version 3.2.5 and earlier, specifically when the system operates under XDM (X Display Manager) environment. This flaw represents a critical privilege escalation vulnerability that exploits improper privilege checking mechanisms within the DPS Server execution framework. The dpsexec utility is responsible for executing distributed processes within the AIX environment, and its insecure implementation creates a pathway for local attackers to manipulate system resources and elevate their privileges beyond normal user limitations.
The technical root cause of this vulnerability stems from inadequate privilege validation within the dpsexec process execution flow. When the system operates under XDM, the dpsexec component fails to properly verify the privileges of the calling process before executing commands or modifying system files. This weakness allows local users to manipulate the execution environment and gain unauthorized access to system resources. The flaw specifically manifests when the utility does not validate whether the executing process possesses sufficient privileges to perform file operations, enabling malicious users to overwrite arbitrary files on the system. This privilege escalation mechanism operates through the exploitation of the XDM environment's trust model, where the system assumes that processes initiated through the display manager maintain appropriate security boundaries.
The operational impact of this vulnerability extends beyond simple privilege escalation to encompass potential system compromise and data integrity violations. Local attackers can leverage this flaw to overwrite critical system files, potentially leading to system instability, unauthorized access to sensitive data, or complete system takeover. The vulnerability affects systems running IBM AIX 3.2.5 and earlier versions, which were commonly deployed in enterprise environments during the late 1990s, making it a significant concern for organizations maintaining legacy systems. Attackers could use this vulnerability to modify system binaries, create backdoors, or establish persistent access mechanisms within the compromised environment. The impact is particularly severe in multi-user environments where XDM is utilized, as it provides a systematic pathway for local users to bypass normal access controls.
Mitigation strategies for CVE-1999-1552 should focus on immediate system hardening and patch implementation. Organizations should upgrade to IBM AIX versions that address this privilege checking flaw, specifically versions beyond 3.2.5 where the vulnerability has been resolved. System administrators should implement strict access controls for XDM environments and consider disabling unnecessary dpsexec functionality when not required. The vulnerability aligns with CWE-276, which addresses improper privilege management, and represents a classic example of insufficient privilege checking in system utilities. From an ATT&CK perspective, this vulnerability maps to privilege escalation techniques under the T1068 category, specifically targeting local system privileges and process manipulation. Security configurations should include monitoring for unauthorized file modifications and implementing proper file permission controls to limit the impact of potential exploitation. Additionally, organizations should conduct regular security assessments of legacy systems to identify similar privilege escalation vulnerabilities that may exist in older software components.