An incorrect permission assignment during the installation script of TeamworkCloud...

Vulnerability Description

An incorrect permission assignment during the installation script of TeamworkCloud 18.0 thru 19.0 allows a local unprivileged attacker to execute arbitrary code as root. During installation, the user is instructed to set the system enviroment file with world writable permissions (0777 /etc/environment). Any local unprivileged user can execute arbitrary code simply by writing to /etc/environment, which will force all users, including root, to execute arbitrary code during the next login or reboot. In addition, the entire home directory of the twcloud user at /home/twcloud is recursively given world writable permissions. This allows any local unprivileged attacker to execute arbitrary code, as twcloud. This product was previous named Cameo Enterprise Data Warehouse (CEDW).

References

• https://docs.nomagic.com/display/TWCloud190/Installation+on+Linux+using+scripts
• https://github.com/sickcodes/security/blob/master/advisories/SICK-2020-002.md
• https://sick.codes/sick-2020-002/
• https://community.nomagic.com/finding-and-fixing-wrong-file-permission-twc-installation-t7165.html
• https://sick.codes/finding-a-vulnerability-in-teamwork-cloud-server-nomagic-3ds-which-is-used-by-gov-enterprise-to-design-rockets-missiles-and-satellites
• https://web.archive.org/web/20201219155833/https://docs.nomagic.com/pages/viewpage.action?pageId=20846937
• https://web.archive.org/web/20201219095507/https://docs.nomagic.com/display/TWCloud185SP1/Installation+on+Centos+7.