CVE-2001-0470 in Solaris
Summary
by MITRE
Buffer overflow in SNMP proxy agent snmpd in Solaris 8 may allow local users to gain root privileges by calling snmpd with a long program name.
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Analysis
by VulDB Data Team • 08/27/2019
The vulnerability described in CVE-2001-0470 represents a critical buffer overflow flaw within the SNMP proxy agent snmpd component of Solaris 8 operating systems. This issue stems from inadequate input validation mechanisms that fail to properly handle excessively long program names passed to the snmpd daemon during execution. The flaw exists specifically within the argument parsing logic where the daemon does not enforce proper bounds checking on command line parameters, creating an exploitable condition that can be leveraged by local attackers to execute arbitrary code with elevated privileges. The vulnerability is particularly concerning because it allows local users to escalate their privileges from standard user level to root access, fundamentally compromising the system's security posture.
The technical implementation of this buffer overflow occurs when the snmpd daemon processes command line arguments without sufficient validation of input length. When a local user invokes the snmpd program with an abnormally long program name, the buffer allocated for storing this parameter becomes insufficient to accommodate the excessive input data. This overflow condition results in the overwrite of adjacent memory locations, including potentially critical program control structures such as return addresses on the stack. The vulnerability aligns with CWE-121, which categorizes buffer overflow conditions where insufficient boundary checking allows attackers to overwrite adjacent memory regions, and specifically relates to CWE-787, which addresses out-of-bounds write vulnerabilities that occur when a buffer is written to without proper bounds checking. Attackers can exploit this condition by carefully crafting a program name that exceeds the allocated buffer space, causing the overflow to overwrite the return address and redirect execution flow to malicious code.
From an operational impact perspective, this vulnerability presents a severe threat to Solaris 8 systems that have SNMP services enabled and running with root privileges. The local privilege escalation capability means that any user with access to execute the snmpd program can potentially gain complete system control, allowing for data exfiltration, system modification, or establishment of persistent backdoors. The attack vector is particularly insidious because it does not require network connectivity or remote access, making it difficult to detect through traditional network monitoring approaches. The vulnerability affects systems where snmpd is running with elevated privileges, which is common in enterprise environments where SNMP monitoring is used for network management. This flaw directly impacts the principle of least privilege and undermines the system's integrity, as legitimate users can exploit this weakness to gain unauthorized administrative access.
The mitigation strategies for CVE-2001-0470 should focus on immediate patching of the Solaris 8 operating system with the appropriate security updates provided by Oracle. System administrators should also implement immediate configuration changes to reduce the attack surface by ensuring that snmpd is not running with root privileges when possible, and by implementing proper input validation for all command line arguments. Network segmentation and access controls should be strengthened to limit local user access to systems running SNMP services. Additionally, organizations should conduct comprehensive vulnerability assessments to identify all instances of snmpd running on their networks and ensure proper privilege separation. The remediation process should also include implementing monitoring for unusual snmpd execution patterns and establishing proper log review procedures to detect potential exploitation attempts. This vulnerability serves as a reminder of the critical importance of proper input validation and privilege separation in system security, aligning with ATT&CK technique T1068 which covers local privilege escalation through exploitation of system vulnerabilities. Organizations should also consider implementing application whitelisting policies to prevent unauthorized execution of potentially vulnerable programs and establish robust patch management processes to address similar vulnerabilities in the future.