Impact
An authenticated backend user with the cms.manage_pages, cms.manage_layouts, or cms.manage_partials permissions who would normally not be permitted to provide PHP code to be executed by the CMS due to cms.enableSafeMode being enabled is able to write specific Twig code to escape the Twig sandbox and execute arbitrary PHP.
This is not a problem for anyone that trusts their users with those permissions to normally write & manage PHP within the CMS by not having cms.enableSafeMode enabled, but would be a problem for anyone relying on cms.enableSafeMode to ensure that users with those permissions in production do not have access to write & execute arbitrary PHP.
Patches
Issue has been patched in Build 469 (v1.0.469) and v1.1.0.
Workarounds
Apply 106daa2...7cb148c to your installation manually if unable to upgrade to Build 469.
References
Reported by ka1n4t
For more information
If you have any questions or comments about this advisory:
Threat assessment:
Impact
An authenticated backend user with the
cms.manage_pages,cms.manage_layouts, orcms.manage_partialspermissions who would normally not be permitted to provide PHP code to be executed by the CMS due tocms.enableSafeModebeing enabled is able to write specific Twig code to escape the Twig sandbox and execute arbitrary PHP.This is not a problem for anyone that trusts their users with those permissions to normally write & manage PHP within the CMS by not having
cms.enableSafeModeenabled, but would be a problem for anyone relying oncms.enableSafeModeto ensure that users with those permissions in production do not have access to write & execute arbitrary PHP.Patches
Issue has been patched in Build 469 (v1.0.469) and v1.1.0.
Workarounds
Apply 106daa2...7cb148c to your installation manually if unable to upgrade to Build 469.
References
Reported by ka1n4t
For more information
If you have any questions or comments about this advisory:
Threat assessment: