CVE-2000-0723 in Gnome Installer
Summary
by MITRE
Helix GNOME Updater helix-update 0.5 and earlier does not properly create /tmp directories, which allows local users to create empty system configuration files such as /etc/config.d/bashrc, /etc/config.d/csh.cshrc, and /etc/rc.config.
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Analysis
by VulDB Data Team • 04/06/2019
The vulnerability identified as CVE-2000-0723 affects the Helix GNOME Updater utility version 0.5 and earlier, specifically targeting the improper handling of temporary directory creation during system configuration file updates. This flaw represents a classic privilege escalation issue that exploits weaknesses in temporary file management and directory creation processes. The vulnerability resides in the software's failure to properly establish secure temporary directories with appropriate permissions, creating opportunities for local users to manipulate system configuration files through indirect means.
The technical implementation of this vulnerability stems from inadequate directory creation mechanisms within the helix-update utility. When the updater executes, it fails to properly establish temporary directories in the /tmp filesystem with restrictive permissions, allowing malicious local users to create symbolic links or manipulate the directory structure. This improper handling of temporary file creation creates a race condition scenario where attackers can intercept or replace configuration files with malicious content. The flaw specifically impacts the creation of system configuration files including /etc/config.d/bashrc, /etc/config.d/csh.cshrc, and /etc/rc.config, which are critical system files that control shell environments and system initialization processes.
From an operational perspective, this vulnerability enables local users to gain unauthorized access to system configuration files and potentially escalate their privileges. The impact extends beyond simple file manipulation as these configuration files control fundamental system behaviors including shell startup processes, environment variables, and system initialization sequences. Attackers can leverage this vulnerability to modify shell configuration files to include malicious commands or create backdoors that persist across system reboots. The vulnerability affects systems running the affected Helix GNOME Updater version and represents a significant security risk in multi-user environments where local privilege escalation opportunities can be exploited to gain elevated system access.
The vulnerability aligns with CWE-377, which addresses insecure temporary file creation practices, and demonstrates characteristics consistent with privilege escalation techniques documented in the ATT&CK framework under privilege escalation tactics. The flaw can be exploited through techniques such as symbolic link attacks or race condition exploitation, where attackers create malicious files in the temporary directory before the legitimate update process completes. Organizations should consider this vulnerability in the context of broader system hardening practices and implement proper temporary file handling procedures. The recommended mitigations include updating to patched versions of the Helix GNOME Updater, implementing proper directory creation with restrictive permissions, and applying system hardening measures to prevent unauthorized modification of critical system configuration files. Additionally, monitoring for unauthorized changes to system configuration files and implementing proper access controls can help detect and prevent exploitation attempts.