In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
sctp: avoid auth_enable sysctl UAF during netns teardown<\/p>\n
proc_sctp_do_auth() updates the SCTP control socket after changing
\nnet.sctp.auth_enable. The handler gets the per-net SCTP state from
\nctl->data, so an already opened sysctl file can still target a network
\nnamespace while that namespace is being torn down.<\/p>\n
SCTP previously registered its per-net sysctls from sctp_defaults_init(),
\nwhile the control socket is created later from sctp_ctrlsock_init(). This
\nexposed a window during initialization where auth_enable was writable
\nbefore net->sctp.ctl_sock existed, and a teardown window where auth_enable
\nstayed writable after inet_ctl_sock_destroy() had released the control
\nsocket.<\/p>\n
Move the per-net SCTP sysctl registration into sctp_ctrlsock_init() after
\nsctp_ctl_sock_init() succeeds, and unregister the sysctl table before
\ndestroying the control socket in sctp_ctrlsock_exit(). If sysctl
\nregistration fails after the control socket was created, destroy the
\ncontrol socket in the same init path.<\/p>\n
Make sctp_sysctl_net_unregister() tolerate a missing header and clear the
\nsaved pointer so init-error and exit paths can safely share the unregister
\nhelper.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
sctp: avoid auth_enable sysctl UAF during netns teardown<\/p>\n
proc_sctp_do_auth() updates the SCTP control socket after changing
\nnet.sc<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-5366","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/5366","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln"}],"about":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/types\/vuln"}],"wp:attachment":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=5366"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=5366"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=5366"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}