CVE-2008-5746 in SNMP Management Agent
Summary
by MITRE
Sun SNMP Management Agent (SUNWmasf) 1.4u2 through 1.5.4 allows local users to overwrite arbitrary files and gain privileges via a symlink attack on temporary files.
If you want to get the best quality for vulnerability data then you always have to consider VulDB.
Analysis
by VulDB Data Team • 12/04/2017
The vulnerability identified as CVE-2008-5746 affects the Sun SNMP Management Agent component known as SUNWmasf version 1.4u2 through 1.5.4. This issue represents a critical security flaw that enables local attackers to exploit symbolic link attacks against temporary files created by the SNMP management agent. The vulnerability stems from insufficient input validation and improper handling of temporary file creation processes within the management agent's operational framework. Attackers can manipulate the system by creating malicious symbolic links that point to sensitive system files, allowing them to overwrite critical files with arbitrary content and subsequently escalate privileges to gain elevated system access.
The technical implementation of this vulnerability resides in the improper use of temporary file creation methods within the SNMP management agent's codebase. When the agent processes certain management requests, it creates temporary files in predictable locations without adequate security checks or atomic file creation mechanisms. This design flaw creates a race condition scenario where local users can establish symbolic links in the same directories where temporary files are expected to be created. The vulnerability specifically aligns with CWE-377, which addresses insecure temporary file creation practices, and CWE-378, which covers the creation of temporary files with insecure permissions. The attack vector operates through a classic symlink attack pattern where the attacker pre-creates symbolic links in the target directory, and when the vulnerable agent creates its temporary files, it inadvertently writes to the attacker-controlled symbolic link targets instead of the intended temporary file locations.
The operational impact of this vulnerability extends beyond simple file overwrites to encompass complete privilege escalation capabilities within the affected system. Local attackers who exploit this vulnerability can gain root or administrative privileges, potentially compromising the entire system's security posture. The SNMP management agent typically runs with elevated privileges to perform system management functions, making it an attractive target for privilege escalation attacks. Once an attacker gains access through this vulnerability, they can modify critical system files, install backdoors, or manipulate system configurations to maintain persistent access. This vulnerability also affects compliance with security standards such as those outlined in the Center for Internet Security (CIS) benchmarks, which emphasize the importance of proper file handling and privilege separation in system management components.
Mitigation strategies for CVE-2008-5746 require immediate system updates and configuration hardening measures. Organizations should prioritize applying the vendor patches released for SUNWmasf versions 1.4u2 through 1.5.4, as these updates typically include proper temporary file creation methods and symbolic link validation. System administrators should also implement proper file system permissions and ensure that temporary directories used by the SNMP management agent have restricted write access. The ATT&CK framework categorizes this vulnerability under privilege escalation techniques, specifically T1068, which involves exploiting vulnerabilities to gain elevated privileges. Additional protective measures include implementing mandatory access controls, monitoring for unusual file creation patterns, and conducting regular security audits of system management components. Organizations should also consider disabling unnecessary SNMP management agent services when not actively required for system administration purposes, reducing the attack surface available to potential exploiters.