- Date Discovered:
- November 15, 2019
- Lexmark Services Monitor is prone to a directory-traversal vulnerability. Remote attackers may use a specially crafted request with directory-traversal sequences ('../') to retrieve sensitive information. This may aid in further attacks. Lexmark Services Monitor 18.104.22.168.39 is vulnerable; other versions may also be affected.
- Lexmark Services Monitor 22.214.171.124.39
Block external access at the network boundary, unless external parties require service.If global access isn't needed, filter access to the affected computer at the network boundary. Restricting access to only trusted computers and networks might greatly reduce the likelihood of successful exploits.
Deploy network intrusion detection systems to monitor network traffic for malicious activity.Deploy NIDS to monitor network traffic for signs of anomalous or suspicious activity. This includes but is not limited to requests that include NOP sleds and unexplained incoming and outgoing traffic. This may indicate exploit attempts or activity that results from a successful exploit.
Run all software as a nonprivileged user with minimal access rights.To limit the potential damage that a successful exploit may achieve, run all nonadministrative software as a regular user with the least amount of privileges required to successfully operate.
Implement multiple redundant layers of security.Since this issue may be leveraged to execute code, we recommend memory-protection schemes, such as nonexecutable stack/heap configurations and randomly mapped memory segments. This tactic may complicate exploits of memory-corruption vulnerabilities.