In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
ntfs: bound the attribute-list entry in ntfs_read_inode_mount()<\/p>\n
The $MFT attribute-list walk in ntfs_read_inode_mount() validates each
\nentry only with “(u8 *)al_entry + 6 > al_end” and
\n“(u8 *)al_entry + le16_to_cpu(al_entry->length) > al_end”, but then reads
\nal_entry->lowest_vcn (an __le64 at offset 8) and al_entry->mft_reference
\n(offset 16) — fields beyond the 6 bytes proven in range. al_entry->length
\nis attacker-controlled and only required non-zero, so a short entry (e.g.
\nlength 8) placed at the tail passes both checks while the lowest_vcn \/
\nmft_reference reads fall past al_end.<\/p>\n
al_end is ni->attr_list + attr_list_size (the on-disk size); the buffer is
\nkvzalloc(round_up(attr_list_size, SECTOR_SIZE)), so the sector rounding
\nusually absorbs the over-read — but when attr_list_size is a multiple of
\nSECTOR_SIZE there is no slack and a crafted $MFT attribute list produces an
\nout-of-bounds read at mount time.<\/p>\n
Validate the entry with ntfs_attr_list_entry_is_valid() (added in patch
\n1\/3) before dereferencing it, matching the bound the other attribute-list
\nwalks now use. The validator already requires the length to cover the fixed
\nheader, which makes the separate “!al_entry->length” check redundant, so
\ndrop it too.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
ntfs: bound the attribute-list entry in ntfs_read_inode_mount()<\/p>\n
The $MFT attribute-list walk in ntfs_read_inode_mount() validates <\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-17417","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/17417","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=17417"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=17417"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=17417"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}