CVE-2007-0536 in rPath
Summary
by MITRE
The chroot helper in rMake for rPath Linux 1 does not drop supplemental groups, which causes packages to be installed with insecure permissions and might allow local users to gain privileges.
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Analysis
by VulDB Data Team • 08/18/2018
The vulnerability identified as CVE-2007-0536 resides within the chroot helper functionality of rMake, a package management tool utilized by rPath Linux 1 operating system. This issue stems from inadequate privilege management during the package installation process, creating a significant security weakness that could be exploited by local attackers. The chroot helper is designed to create a restricted environment for package installation, but fails to properly handle group permissions, leaving supplemental groups active during the installation process. This flaw directly violates fundamental security principles of privilege separation and least privilege access, creating an environment where package installations can occur with elevated permissions beyond what is strictly necessary for the installation task.
The technical root cause of this vulnerability lies in the improper implementation of the chroot helper's privilege dropping mechanism. When rMake executes package installations, it should transition from a high-privilege context to a restricted environment with minimal required permissions. However, the chroot helper fails to properly drop supplemental groups that are typically associated with the user account running the installation process. This oversight allows package installation to maintain access to additional group memberships that could provide unauthorized access to system resources or files. The vulnerability is classified under CWE-250 as "Execute Code with Unnecessary Privileges" and represents a failure in proper privilege management during system operations. The flaw specifically affects the Unix-style permission model where group memberships can provide access to restricted resources, creating a vector for privilege escalation.
The operational impact of CVE-2007-0536 extends beyond simple permission issues, as it creates a pathway for local users to potentially gain elevated privileges within the system. When packages are installed with the inherited supplemental groups, they may be able to access files or resources that should normally be restricted to specific user groups or administrative roles. This could enable attackers to modify system files, install malicious software, or access sensitive data that would otherwise be protected by proper access controls. The vulnerability is particularly dangerous in environments where multiple users share the same system or where administrative privileges are not strictly controlled. Attackers could leverage this weakness to escalate their privileges from regular user level to administrative level, potentially compromising the entire system. This issue maps to ATT&CK technique T1068 which involves privilege escalation through the exploitation of system vulnerabilities.
Mitigation strategies for this vulnerability require immediate implementation of proper privilege dropping mechanisms within the rMake chroot helper functionality. System administrators should ensure that all package management operations properly drop supplemental groups before executing installation processes, following the principle of least privilege. The recommended approach involves implementing comprehensive privilege management that explicitly removes all non-essential group memberships during the chroot operation. Additionally, regular security audits should verify that all system components properly handle privilege transitions, particularly in package management and installation processes. Organizations should also consider updating to newer versions of rMake or rPath Linux that have addressed this specific vulnerability. The fix should include mandatory privilege dropping for all chroot operations and implementation of proper access control verification mechanisms to ensure that package installations occur with minimal necessary permissions. This vulnerability demonstrates the critical importance of proper privilege management in system security and highlights the need for comprehensive security testing of core system components.