In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
ksmbd: fix path resolution in ksmbd_vfs_kern_path_create<\/p>\n
The SMB2 open lookup is rooted at the share with LOOKUP_BENEATH, but the
\ncreate\/mkdir\/hardlink sink is not: ksmbd_vfs_kern_path_create() builds an
\nabsolute path with convert_to_unix_name() and resolves it from AT_FDCWD
\nvia start_creating_path(), so a “..” component is walked from the real
\nfilesystem root and escapes the export.<\/p>\n
An authenticated client races a missing path component so the rooted open
\nlookup returns -ENOENT (taking the create branch) while the same component
\nis present (a directory) when the create walk runs; the create then
\nresolves “..” out of the share.<\/p>\n
Root the create walk at the share like the lookup and rename paths already
\nare: resolve the parent with vfs_path_parent_lookup(…, LOOKUP_BENEATH,
\n&share_conf->vfs_path) and create the final component with
\nstart_creating_noperm(). convert_to_unix_name() then has no callers and is
\nremoved.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
ksmbd: fix path resolution in ksmbd_vfs_kern_path_create<\/p>\n
The SMB2 open lookup is rooted at the share with LOOKUP_BENEATH, but the<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-5315","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/5315","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=5315"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=5315"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=5315"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}