CVE-2019-9055

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.

Weakness

The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.

Affected Software

Potential Mitigations

• Make fields transient to protect them from deserialization.
• An attempt to serialize and then deserialize a class containing transient fields will result in NULLs where the transient data should be. This is an excellent way to prevent time, environment-based, or sensitive variables from being carried over and used improperly.

Related Attack Patterns

• https://cwe.mitre.org/data/definitions/586.html

References

• 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
• https://newsletter.cmsmadesimple.org/w/89247Qog4jCRCuRinvhsofwg
• https://www.cmsmadesimple.org/2019/03/Announcing-CMS-Made-Simple-v2.2.10-Spuzzum
• 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
• https://newsletter.cmsmadesimple.org/w/89247Qog4jCRCuRinvhsofwg
• https://www.cmsmadesimple.org/2019/03/Announcing-CMS-Made-Simple-v2.2.10-Spuzzum