In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
ntfs3: fix out-of-bounds read in ntfs_dir_emit() and hdr_find_e()<\/p>\n
The bounds check in ntfs_dir_emit() compares fname->name_len (a
\ncharacter count) against e->size (a byte count) without accounting
\nfor the 2-byte-per-character UTF-16LE encoding or the ATTR_FILE_NAME
\nheader size:<\/p>\n
if (fname->name_len + sizeof(struct NTFS_DE) > le16_to_cpu(e->size))<\/p>\n
This computes: name_len + 16 > e_size<\/p>\n
The correct check must account for the ATTR_FILE_NAME header (66 bytes
\nbefore the name) and the UTF-16LE character size (2 bytes each):<\/p>\n
sizeof(NTFS_DE) + offsetof(ATTR_FILE_NAME, name) +
\n name_len * sizeof(short) > e_size<\/p>\n
Which computes: 16 + 66 + name_len * 2 > e_size<\/p>\n
The correct calculation already exists as fname_full_size() in ntfs.h
\nand is used in cmp_fnames(), namei.c, and fslog.c, but was not used
\nin the readdir path.<\/p>\n
A crafted NTFS image with an index entry containing a small e->size
\nbut large fname->name_len bypasses the current check, causing
\nntfs_utf16_to_nls() to read past the entry boundary.<\/p>\n
Additionally, add a key_size validation in hdr_find_e() to ensure the
\ndeclared key_size does not exceed the available entry data, preventing
\ncomparison functions from reading past entry boundaries on the lookup
\npath.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
ntfs3: fix out-of-bounds read in ntfs_dir_emit() and hdr_find_e()<\/p>\n
The bounds check in ntfs_dir_emit() compares fname->name_len (a<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-28684","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/28684","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=28684"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=28684"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=28684"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}