CVE-2000-1071 in iPlanet iCal
Summary
by MITRE
The GUI installation for iCal 2.1 Patch 2 disables access control for the X server using an "xhost +" command, which allows remote attackers to monitor X Windows events and gain privileges.
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Analysis
by VulDB Data Team • 04/06/2019
The vulnerability described in CVE-2000-1071 represents a critical security flaw in the iCal 2.1 Patch 2 graphical user interface installation process that fundamentally undermines the security model of the X Window System. This issue stems from the installation routine executing an xhost + command which indiscriminately grants access to the X server without proper authentication mechanisms. The X Window System, commonly known as X11, serves as the foundation for graphical user interfaces in Unix-like operating systems and relies on strict access controls to prevent unauthorized monitoring and manipulation of graphical sessions. When the installation process disables these access controls through the xhost + command, it creates an exploitable condition that allows remote attackers to capture X Windows events and potentially escalate privileges.
The technical implementation of this vulnerability exploits the inherent trust model of the X Window System by removing the access control restrictions that normally prevent unauthorized users from monitoring or interfering with graphical sessions. The xhost + command specifically disables access control for the X server, effectively allowing any user or process on the network to connect to the X server and monitor events such as keystrokes, window movements, and other graphical interactions. This flaw operates at the system level and can be classified under CWE-264 as "Permissions, Privileges, and Access Controls" with specific implications for CWE-284 which addresses "Improper Access Control" in the context of X Window System security. The vulnerability demonstrates a clear lack of proper privilege management during the installation process and represents a fundamental failure in secure coding practices.
From an operational perspective, this vulnerability enables remote attackers to perform sophisticated surveillance and privilege escalation attacks against systems running iCal 2.1 Patch 2. The ability to monitor X Windows events provides attackers with potential access to sensitive information such as passwords entered through graphical interfaces, screen content, and user interaction patterns. Additionally, the vulnerability can be leveraged for more advanced attack vectors including session hijacking, keylogging, and potential privilege escalation to root or administrative levels. This represents a significant threat to enterprise environments where iCal installations might be present, as it allows attackers to gain unauthorized access to graphical sessions without requiring authentication credentials. The attack surface extends beyond simple monitoring to include potential system compromise through the exploitation of the weakened access controls.
Mitigation strategies for CVE-2000-1071 should focus on immediate remediation through patching and proper access control enforcement. Organizations should ensure that iCal 2.1 Patch 2 is either updated to a patched version or completely removed from systems where it poses a risk. The xhost + command should never be executed during installation processes without proper security controls and authentication mechanisms. Security administrators should implement proper X11 access control policies using xhost - command to remove unnecessary access permissions and enforce strict access controls. This vulnerability aligns with ATT&CK technique T1059 which covers command and scripting interpreter usage, and T1068 which addresses privilege escalation through local system access. System hardening measures should include disabling unnecessary X11 access, implementing proper network segmentation, and ensuring that installation processes do not execute commands that weaken system security controls. Regular security audits should verify that access controls remain properly configured and that no unauthorized access permissions have been granted to X server connections.