An issue was discovered in Icinga2 before v2.12.0-rc1. The prepare-dirs script (run as part of the icinga2 systemd service) executes chmod 2750 /run/icinga2/cmd. /run/icinga2 is under control of an unprivileged user by default. If /run/icinga2/cmd is a symlink, then it will by followed and arbitrary files can be changed to mode 2750 by the unprivileged icinga2 user.

References

• https://nvd.nist.gov/vuln/detail/CVE-2020-14004
• Icinga/icinga2@2f0f2e8
• https://bugzilla.suse.com/show_bug.cgi?id=CVE-2020-14004
• Icinga/icinga2@v2.12.0-rc1...master
• https://github.com/Icinga/icinga2/releases
• http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00014.html
• http://www.openwall.com/lists/oss-security/2020/06/12/1