CVE-2000-0722 in Gnome Updater
Summary
by MITRE
Helix GNOME Updater helix-update 0.5 and earlier allows local users to install arbitrary RPM packages by creating the /tmp/helix-install installation directory before root has begun installing packages.
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Analysis
by VulDB Data Team • 04/06/2019
The vulnerability identified as CVE-2000-0722 represents a critical privilege escalation flaw in the Helix GNOME Updater utility version 0.5 and earlier. This issue stems from a race condition and insecure temporary file handling mechanism that allows local attackers to manipulate the package installation process. The vulnerability specifically targets the /tmp/helix-install directory creation process, which serves as a critical installation staging area during package updates. When the helix-update utility executes with root privileges to install packages, it does not properly validate or secure the temporary installation directory that is created in the /tmp filesystem. This design flaw creates a window of opportunity for malicious users to pre-create the targeted directory structure with malicious permissions or content before the legitimate installation process begins.
The technical exploitation of this vulnerability involves a classic race condition attack pattern where the attacker must time their actions precisely to gain control over the installation process. The flaw manifests when the update utility checks for the existence of the /tmp/helix-install directory and creates it if it does not exist, without proper atomic operations or access control validation. This insecure directory creation allows attackers to establish a malicious installation environment that will be used by the root-privileged update process. The vulnerability is classified under CWE-377 as "Insecure Temporary File" and also relates to CWE-284 as "Improper Access Control" since the utility fails to properly secure temporary resources. From an operational perspective, this vulnerability directly enables local privilege escalation attacks where unprivileged users can execute arbitrary code with root privileges, effectively compromising the entire system.
The impact of this vulnerability extends beyond simple privilege escalation to encompass full system compromise and persistent access. When successfully exploited, attackers can install malicious RPM packages that contain backdoors, rootkits, or other malicious software components that persist beyond the initial exploitation. The attack vector is particularly dangerous because it requires no network connectivity and can be executed entirely locally, making it difficult to detect through network monitoring systems. The vulnerability aligns with ATT&CK technique T1068 which covers "Local Privilege Escalation" and specifically demonstrates how insecure temporary file handling can be leveraged to achieve elevated privileges. The race condition nature of this flaw means that the window of opportunity for exploitation is narrow but significant, requiring precise timing and execution. System administrators should note that this vulnerability affects systems running older versions of the Helix GNOME Updater utility and represents a fundamental flaw in the software's security architecture that relies on insecure temporary file operations.
Mitigation strategies for CVE-2000-0722 should focus on immediate software updates and system hardening measures. The most effective solution involves upgrading to a patched version of the Helix GNOME Updater utility that properly handles temporary directory creation with appropriate access controls and atomic operations. Organizations should implement proper file system permissions for temporary directories, ensuring that only the intended user or process can create and modify these locations. The system should also employ proper directory creation practices that use secure temporary file creation functions which prevent attackers from pre-creating malicious directories. Additionally, monitoring for unauthorized creation of temporary directories in the /tmp filesystem should be implemented to detect potential exploitation attempts. From a security architecture standpoint, this vulnerability highlights the importance of following secure coding practices that avoid race conditions in privileged operations. The incident should prompt a review of all software components that handle temporary file operations and privilege escalation scenarios to ensure similar vulnerabilities are not present in other system components.