Synopsis
While researching CVE-2017-14024 for a Nessus plugin, Tenable found a new stack buffer overflow in InduSoft Web Studio and InTouch Machine Edition. The vulnerability is similar to CVE-2017-14024 in that it involves calling mbstowcs() in TCPServer.dll. However, this new vulnerability leverages command 50 instead of command 49.
The following is a proof of concept:
cat <(echo -ne '\x02\x57\x03\x02\x32'`python -c 'print "A"*0x500'`'\x09\x0a\x03') - | nc <target_host> 1234
A remote unauthenticated attacker can leverage this attack to execute arbitrary code.
Solution
Schneider Electric has released InduSoft Web Studio v8.1 SP1 and InTouch Machine Edition 2017 v8.1 SP1 to address this vulnerability.Additional References
http://software.schneider-electric.com/pdf/security-bulletin/lfsec00000125/https://ics-cert.us-cert.gov/advisories/ICSA-18-107-01
https://www.tenable.com/blog/tenable-research-advisory-critical-schneider-electric-indusoft-web-studio-and-intouch-machine
Disclosure Timeline
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