In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
smb: client: reject userspace cifs.idmap descriptions<\/p>\n
cifs.idmap key descriptions carry authority-bearing fields (owner and
\ngroup SIDs and uid\/gid values in “os:”\/”gs:”\/”oi:”\/”gi:” form) that the
\ncifs.idmap upcall helper treats as kernel-originating inputs. Unlike
\nits sibling cifs.spnego, the cifs.idmap key type has no vet_description
\nhook, so userspace can create keys of this type through
\nrequest_key(2)\/add_key(2) and supply those fields without CIFS origin.
\nA request_key(2) call with a non-NULL callout then drives a root
\nusermodehelper upcall (\/sbin\/request-key -> cifs.idmap) that consumes
\nthe unvetted description in root context.<\/p>\n
Only accept cifs.idmap descriptions while CIFS is using its private
\nroot_cred to request the key. id_to_sid()\/sid_to_id() already run
\nunder override_creds(root_cred), so the kernel-originated path is
\nunaffected.<\/p>\n
This mirrors commit 3da1fdf4efbc (“smb: client: reject userspace
\ncifs.spnego descriptions”), which applied the same restriction to
\ncifs.spnego.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
smb: client: reject userspace cifs.idmap descriptions<\/p>\n
cifs.idmap key descriptions carry authority-bearing fields (owner and
\ngroup <\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-28996","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/28996","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=28996"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=28996"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=28996"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}