CVE-1999-0888 in Database Server
Summary
by MITRE
dbsnmp in Oracle Intelligent Agent allows local users to gain privileges by setting the ORACLE_HOME environmental variable, which dbsnmp uses to find the nmiconf.tcl script.
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Analysis
by VulDB Data Team • 12/03/2024
The vulnerability identified as CVE-1999-0888 resides within the Oracle Intelligent Agent's dbsnmp component, representing a classic privilege escalation flaw that exploits environmental variable manipulation. This vulnerability specifically targets the insecure handling of the ORACLE_HOME environment variable, which serves as a critical configuration parameter for Oracle database systems. The dbsnmp process, designed to manage database monitoring functions, relies on this variable to locate essential configuration scripts including nmiconf.tcl, making it susceptible to path manipulation attacks that can result in elevated system privileges.
The technical exploitation mechanism leverages the predictable nature of how dbsnmp resolves script locations through the ORACLE_HOME variable. When a local user manipulates this environment variable to point to a maliciously crafted directory containing a specially named nmiconf.tcl script, the dbsnmp process executes code with the privileges of the user running the agent. This represents a path traversal and privilege escalation vulnerability that aligns with CWE-276, which specifically addresses improper privileges and access control issues. The flaw demonstrates how insecure default configurations and improper input validation can create attack vectors for local privilege escalation.
From an operational impact perspective, this vulnerability presents a significant risk to Oracle database environments as it allows any local user to potentially escalate their privileges to that of the database agent process. The attack requires only local system access and basic knowledge of environment variable manipulation, making it particularly dangerous in multi-user environments where users may have limited system access but could exploit this vulnerability to gain unauthorized elevated privileges. The vulnerability affects systems where Oracle Intelligent Agent is installed and running with sufficient privileges to execute monitoring functions, creating a persistent backdoor for attackers who can maintain elevated access.
Security mitigations for CVE-1999-0888 should focus on implementing proper environment variable validation and restricting the execution privileges of the dbsnmp process. Organizations should ensure that the ORACLE_HOME variable is properly validated and that the nmiconf.tcl script locations are verified before execution. The recommended approach includes implementing strict access controls on the Oracle installation directories, using privilege separation techniques, and ensuring that database monitoring processes run with minimal required privileges. This vulnerability also highlights the importance of following the principle of least privilege and adhering to security best practices such as those outlined in the MITRE ATT&CK framework under privilege escalation techniques, where environmental variable manipulation represents a common method for gaining elevated system access. Additionally, regular patching and configuration audits should be performed to prevent exploitation of such legacy vulnerabilities that may remain unpatched in older Oracle installations.