CVE-2005-0134 in UnixWare
Summary
by MITRE
the x server in sco unixware 7.1.1 7.1.3 and 7.1.4 does not properly create socket directories in /tmp which could allow attackers to hijack local sockets.
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Analysis
by VulDB Data Team • 06/06/2019
The vulnerability described in CVE-2005-0134 represents a critical security flaw in the X Window System implementation within SCO Unixware operating system versions 7.1.1, 7.1.3, and 7.1.4. This issue stems from improper handling of socket directory creation within the /tmp filesystem, creating a persistent security weakness that attackers can exploit to gain unauthorized access to local socket communications. The flaw specifically affects the X server's initialization process where socket directories are not properly secured during creation, leaving them vulnerable to manipulation by malicious users.
The technical root cause of this vulnerability lies in the inadequate permission settings and directory creation procedures employed by the X server during system startup. When the X server initializes, it creates socket directories in the /tmp filesystem to facilitate communication between the display server and client applications. However, the implementation fails to properly set secure permissions on these directories, allowing local users to create symbolic links or manipulate the directory structure before the X server can establish its intended socket connections. This race condition vulnerability enables attackers to place malicious socket files in strategic locations, effectively hijacking the legitimate socket communications that should be protected by proper access controls.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it allows attackers to intercept, modify, or redirect X11 protocol communications between applications and the display server. This can result in unauthorized access to graphical user interfaces, potential data interception from graphical applications, and the ability to inject malicious commands into legitimate X11 sessions. The vulnerability is particularly concerning in multi-user environments where local attackers can exploit this weakness to compromise the security of graphical sessions, potentially leading to complete system compromise through the exploitation of graphical applications that rely on X11 communication channels.
From a cybersecurity perspective, this vulnerability aligns with CWE-276, which addresses improper file permissions, and represents a classic example of a race condition vulnerability that has been documented in numerous security frameworks. The flaw demonstrates the importance of proper privilege separation and secure directory creation practices in system-level components, particularly those handling network communications. Organizations implementing SCO Unixware systems should prioritize immediate patching of this vulnerability, as it provides attackers with a straightforward path to compromising local X11 communications and potentially escalating privileges within the system.
Mitigation strategies for this vulnerability should include immediate application of vendor-provided security patches that properly secure socket directory creation and implement proper permission controls during X server initialization. System administrators should also consider implementing additional monitoring of /tmp directory modifications and establishing strict access controls for local users to prevent unauthorized manipulation of system socket directories. The vulnerability serves as a reminder of the critical importance of secure coding practices in system-level components and the necessity of thorough security testing for privileged system services that handle network communications. Organizations should also review their overall security posture to ensure that similar race condition vulnerabilities do not exist in other system components that might provide similar attack vectors for local privilege escalation or communication interception.