In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
ntfs3: reject direct userspace writes to reserved $LX* xattrs<\/p>\n
NTFS3 uses $LXUID, $LXGID, $LXMOD and $LXDEV as internal WSL
\npermission metadata and reloads them into i_uid, i_gid and i_mode
\nfrom ntfs_get_wsl_perm().<\/p>\n
Because the empty-prefix xattr handler also lets file owners call
\nsetxattr() on these names directly, an unprivileged writer on a
\nwritable ntfs3 mount can plant root ownership and S_ISUID on their own
\nfile and gain euid 0 after inode reload.<\/p>\n
Reject direct userspace writes to the reserved $LX* names. Internal
\nntfs3 metadata updates are unchanged because ntfs_save_wsl_perm()
\nwrites them via ntfs_set_ea() directly.<\/p>\n
[almaz.alexandrovich@paragon-software.com: added an additional check for non privileged users]<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
ntfs3: reject direct userspace writes to reserved $LX* xattrs<\/p>\n
NTFS3 uses $LXUID, $LXGID, $LXMOD and $LXDEV as internal WSL
\npermiss<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-14904","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/14904","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=14904"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=14904"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=14904"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}