October 23, 2019
CODESYS ENI Server is prone to a stack-based buffer-overflow vulnerability. Exploiting this issue may allow remote attackers to execute arbitrary code within the context of the affected application. Failed attacks will cause denial-of-service conditions. CODESYS ENI Server versions prior to 18.104.22.168 are vulnerable.
- 3S-Software CODESYS ENI Server 22.214.171.124
- 3S-Software CoDeSys 2.3
- 3S-Software CoDeSys 126.96.36.199
- 3S-Software CoDeSys 188.8.131.52
- 3S-Software CoDeSys 184.108.40.206
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.
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.
Do not accept or execute files from untrusted or unknown sources.
To reduce the likelihood of successful exploits, never handle files that originate from unfamiliar or untrusted sources.
Do not follow links provided by unknown or untrusted sources.
To reduce the likelihood of successful exploits, never visit sites of questionable integrity or follow links provided by unfamiliar or untrusted sources.
Implement multiple redundant layers of security.
Since these issues 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.
Updates are available. Please see the references or vendor advisory for more information.
Chen Jie from NSFOCUS
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