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VuXML IDDescription
0f8bf913-7efa-11ec-8c04-2cf05d620eccpolkit -- Local Privilege Escalation

Qualys reports:

We discovered a Local Privilege Escalation (from any user to root) in polkit's pkexec, a SUID-root program that is installed by default on every major Linux distribution.

Discovery 2022-01-25
Entry 2022-01-26
lt 0.120_1

631fc042-b636-11e5-83ef-14dae9d210b8polkit -- multiple vulnerabilities

Colin Walters reports:

  • Integer overflow in the authentication_agent_new_cookie function in PolicyKit (aka polkit) before 0.113 allows local users to gain privileges by creating a large number of connections, which triggers the issuance of a duplicate cookie value.

  • The authentication_agent_new function in polkitbackend/polkitbackendinteractiveauthority.c in PolicyKit (aka polkit) before 0.113 allows local users to cause a denial of service (NULL pointer dereference and polkitd daemon crash) by calling RegisterAuthenticationAgent with an invalid object path.

  • The polkit_backend_action_pool_init function in polkitbackend/polkitbackendactionpool.c in PolicyKit (aka polkit) before 0.113 might allow local users to gain privileges via duplicate action IDs in action descriptions.

  • PolicyKit (aka polkit) before 0.113 allows local users to cause a denial of service (memory corruption and polkitd daemon crash) and possibly gain privileges via unspecified vectors, related to "javascript rule evaluation."

Discovery 2015-06-03
Entry 2016-01-08
lt 0.113
36a35d83-c560-11eb-84ab-e0d55e2a8bf9polkit -- local privilege escalation using polkit_system_bus_name_get_creds_sync

Cedric Buissart reports:

The function polkit_system_bus_name_get_creds_sync is used to get the uid and pid of the process requesting the action. It does this by sending the unique bus name of the requesting process, which is typically something like ":1.96", to dbus-daemon. These unique names are assigned and managed by dbus-daemon and cannot be forged, so this is a good way to check the privileges of the requesting process.

The vulnerability happens when the requesting process disconnects from dbus-daemon just before the call to polkit_system_bus_name_get_creds_sync starts. In this scenario, the unique bus name is no longer valid, so dbus-daemon sends back an error reply. This error case is handled in polkit_system_bus_name_get_creds_sync by setting the value of the error parameter, but it still returns TRUE, rather than FALSE. This behavior means that all callers of polkit_system_bus_name_get_creds_sync need to carefully check whether an error was set. If the calling function forgets to check for errors then it will think that the uid of the requesting process is 0 (because the AsyncGetBusNameCredsData struct is zero initialized). In other words, it will think that the action was requested by a root process, and will therefore allow it.

Discovery 2021-06-03
Entry 2021-06-04
lt 0.119