CVE-2003-1033 in SAP
Summary
by MITRE
The (1) instdbmsrv and (2) instlserver programs in SAP DB Development Tools 7.x trust the user-provided INSTROOT environment variable as a path when assigning setuid permissions to the lserver program, which allows local users to gain root privileges via a modified INSTROOT that points to a malicious dbmsrv or lserver program.
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Analysis
by VulDB Data Team • 06/18/2018
The vulnerability identified as CVE-2003-1033 represents a critical privilege escalation flaw within SAP DB Development Tools version 7.x, specifically affecting the installation utilities instdbmsrv and instlserver. This vulnerability stems from improper validation of user-provided environment variables during the installation process, creating a path traversal and privilege escalation vector that can be exploited by local attackers to gain root privileges. The flaw exists because these installation programs blindly trust the INSTROOT environment variable without performing adequate sanitization or validation checks before using it to assign setuid permissions to the lserver program.
The technical implementation of this vulnerability involves the manipulation of environment variables during the software installation phase. When the installation utilities execute, they read the INSTROOT environment variable to determine where to place system binaries, including the lserver program that requires elevated privileges. The absence of proper input validation means that a malicious user can set this environment variable to point to a directory containing a specially crafted malicious version of dbmsrv or lserver. When the installation process runs with elevated privileges, it sets the setuid bit on the malicious binary, allowing any local user to execute it with root privileges. This represents a classic case of insecure environment variable handling that violates fundamental security principles of least privilege and input validation.
The operational impact of this vulnerability is severe and far-reaching for any system running SAP DB Development Tools 7.x. Local users who can manipulate the installation process gain the ability to escalate their privileges to root level, which provides complete control over the affected system. This includes the capability to install backdoors, modify system files, access sensitive data, and potentially compromise the entire network infrastructure. The vulnerability is particularly dangerous because it can be exploited during legitimate installation activities, making it difficult to detect and prevent. Attackers can exploit this by creating a malicious installation scenario where they control the INSTROOT variable to point to a directory they own, then place their malicious binaries in that location. This type of attack aligns with attack techniques categorized under privilege escalation in the MITRE ATT&CK framework, specifically targeting the use of environment variables to manipulate program execution paths.
This vulnerability maps directly to CWE-276, which describes "Incorrect Default Permissions," and CWE-78, which addresses "Improper Neutralization of Special Elements used in OS Command Injection." The flaw demonstrates how improper environment variable handling can lead to privilege escalation through the manipulation of setuid binaries, which is a well-documented pattern in security research and exploitation techniques. Organizations using SAP DB Development Tools 7.x are strongly advised to implement immediate mitigations including updating to patched versions, disabling unnecessary installation utilities, and implementing strict environment variable controls. System administrators should also consider implementing monitoring for suspicious environment variable usage patterns and ensure that only authorized personnel have access to installation processes that could be exploited in this manner. The vulnerability highlights the importance of proper input validation and the principle of least privilege in system design, particularly when dealing with installation utilities that require elevated permissions during execution.