model/modelstorage.py
in the Tryton application framework (trytond) before 2.4.0 for Python does not properly restrict access to the Many2Many field in the relation model, which allows remote authenticated users to modify the privileges of arbitrary users via a (1) create, (2) write, (3) delete, or (4) copy rpc call.
hg.tryton.org/trytond/rev/8e64d52ecea4
www.debian.org/security/2012/dsa-2444
bugs.tryton.org/issue2476
github.com/tryton/trytond
github.com/tryton/trytond/commit/d059ebb792401ded3129cd9402d7392dc34b81e3
nvd.nist.gov/vuln/detail/CVE-2012-0215
web.archive.org/web/20121113201043/news.tryton.org/2012/03/security-releases-for-all-supported.html