Wecon PLC Editor CVE-2019-18236 Multiple Stack Based Buffer Overflow Vulnerabilities

Risk

High

Date Discovered

December 19, 2019

Description

Wecon PLC Editor is prone to multiple stack-based buffer-overflow vulnerabilities. Attackers can exploit these issues to execute arbitrary code within the context of the application. Failed exploit attempts will likely cause denial-of-service conditions. PLC Editor 1.3.5_20190129 is vulnerable; other versions may also be affected.

Technologies Affected

  • WECON PLC Editor 1.3.5_20190129

Recommendations

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.

Do not accept or execute files from untrusted or unknown sources.
To limit exposure to these and other latent vulnerabilities, 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 attacks, never visit sites of questionable integrity or follow links provided by unfamiliar or untrusted sources.

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.

Currently, we are not aware of any vendor-supplied patches. If you feel we are in error or are aware of more recent information, please mail us at: vuldb@securityfocus.com.

Credits

Francis Provencher (PRL) and Natnael Samson (Natti) working with Trend Micro’s Zero Day Initiative


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