Description
An issue was discovered in CMS Made Simple 2.2.8. In the module DesignManager (in the files action.admin_bulk_css.php and action.admin_bulk_template.php), with an unprivileged user with Designer permission, it is possible reach an unserialize call with a crafted value in the m1_allparms parameter, and achieve object injection.
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
Metasploit 1 module
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CMS Made Simple Authenticated RCE via object injection
exploit/multi/http/cmsms_object_injection_rce
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
References
- https://www.cmsmadesimple.org/2019/03/Announcing-CMS-Made-Simple-v2.2.10-Spuzzum
- https://newsletter.cmsmadesimple.org/w/89247Qog4jCRCuRinvhsofwg
- http://packetstormsecurity.com/files/155322/CMS-Made-Simple-2.2.8-Remote-Code-Execution.html
- https://blog.certimetergroup.com/it/articolo/security/CMS_Made_Simple_deserialization_attack_%28CVE-2019-9055%29