In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
ntfs: bound the look-ahead attribute-list entry in ntfs_external_attr_find()<\/p>\n
When resolving an attribute lookup with a non-zero @lowest_vcn,
\nntfs_external_attr_find() peeks at the next $ATTRIBUTE_LIST entry to
\ndecide whether to keep searching, but bounds that not-yet-validated
\nentry only with “(u8 *)next_al_entry + 6 < al_end" (which proves just
\nbytes 0..6 are in range) and "(u8 *)next_al_entry + length lowest_vcn (an __le64 at offset 8) and the name at
\nnext_al_entry->name_offset, both of which can lie past al_end — the
\nexact end of the kvmalloc’d attribute-list buffer (allocated at the
\non-disk attr_list_size, no rounding). A crafted on-disk $ATTRIBUTE_LIST
\nwhose last entry sits a few bytes before al_end therefore yields a slab
\nout-of-bounds read when the inode is read.<\/p>\n
Validate the look-ahead entry with ntfs_attr_list_entry_is_valid() (added
\nin patch 1\/3) before dereferencing lowest_vcn and the name, so the same
\nfixed-header, length and name bounds the main attribute-list walk uses now
\nguard this read too.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
ntfs: bound the look-ahead attribute-list entry in ntfs_external_attr_find()<\/p>\n
When resolving an attribute lookup with a non-zero @l<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-12332","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/12332","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=12332"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=12332"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=12332"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}