Source: cve@mitre.org
A race condition in the Solaris ps command allows an attacker to overwrite critical files.
Solaris systems are vulnerable to a critical race condition in the ps command, allowing attackers to overwrite arbitrary files. This can lead to complete system compromise, including privilege escalation and data theft. Immediate patching and system hardening are essential to mitigate this severe risk.
Step 1: Process Creation: The attacker creates a large number of short-lived processes, designed to rapidly appear and disappear. This is often achieved through a script or program that forks and exits quickly.
Step 2: Timing Attack: The attacker executes the ps command, or a modified version of it, at a specific time, attempting to trigger the race condition. This timing is critical and often requires trial and error or sophisticated timing techniques.
Step 3: File Overwrite: Due to the race condition, the ps command, or a related process, attempts to access or modify a file while the attacker's processes are rapidly changing the system state. The attacker's processes are designed to influence the file that is accessed.
Step 4: Privilege Escalation (Potential): If the attacker can overwrite a critical system file (e.g., a configuration file, a setuid binary, or a file used by a privileged process), they can gain elevated privileges. This could involve injecting malicious code or modifying system behavior to their advantage.
Step 5: System Compromise: With elevated privileges, the attacker can execute arbitrary commands, install backdoors, steal sensitive data, and completely compromise the system.
The vulnerability stems from a race condition within the ps command's handling of process information. Specifically, the command's internal workings involve accessing and processing data about running processes. An attacker can exploit this by rapidly creating and deleting processes, manipulating the timing of the ps command's operations. This timing manipulation allows the attacker to influence the command's behavior, potentially leading to the overwriting of files. The root cause is likely a lack of proper synchronization or locking mechanisms when accessing shared resources (e.g., process table entries) within the ps command's code. This allows for a window of opportunity where an attacker can influence the state of the system.
Due to the age of the vulnerability, it's possible that various APT groups and opportunistic attackers may leverage this exploit. Specific APT attribution is difficult due to the age and nature of the vulnerability. The CISA KEV status is likely to be Not Listed, given the age and the fact that Solaris is not widely used in modern enterprise environments.
Monitor system logs for unusual activity related to the ps command, especially rapid process creation and deletion.
Analyze file system modifications for unexpected changes to critical system files.
Implement intrusion detection systems (IDS) with signatures that detect known exploit attempts.
Monitor network traffic for suspicious activity that could indicate remote exploitation attempts.
Review process accounting data for anomalies.
Use file integrity monitoring tools to detect unauthorized modifications to system binaries and configuration files.
Apply the vendor-provided patch immediately. This is the primary and most effective remediation step.
Implement a robust patch management process to ensure timely application of security updates.
Restrict access to the ps command where possible, especially for untrusted users.
Implement file system permissions that prevent unauthorized modification of critical system files.
Harden the system by disabling unnecessary services and features.
Regularly audit system logs and configurations to identify potential vulnerabilities and misconfigurations.
Implement a defense-in-depth strategy, including firewalls, intrusion detection systems, and regular security assessments.