In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
ntfs: validate non-resident attribute offsets<\/p>\n
ntfs_attr_update_meta() shifts the attribute name when converting between
\nnon-sparse and sparse attributes. Converting to sparse also adds the
\ncompressed_size field before the name and mapping pairs, requiring eight
\nadditional bytes in the attribute record.<\/p>\n
However, the validator does not check that name_offset is within safe
\nboundaries for these operations or that the additional space is available.
\nA malicious MFT record could set name_offset such that:<\/p>\n
1. The name is positioned at the very end of a non-sparse attribute.
\n Converting to sparse would shift the name forward by 8 bytes,
\n writing beyond the attribute boundary.<\/p>\n
2. The name overlaps with the mapping pairs, causing corruption during
\n conversion.<\/p>\n
Add validation to ensure:
\n– For named attributes, name_offset is within valid bounds
\n– Name does not extend beyond the attribute or overlap with mapping pairs
\n– For non-sparse, non-compressed attributes, eight bytes are available
\n after mapping_pairs_offset for the compressed_size field<\/p>\n
The space check also covers unnamed attributes, for which name_offset = 0
\nis valid and no name range needs to be checked.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
ntfs: validate non-resident attribute offsets<\/p>\n
ntfs_attr_update_meta() shifts the attribute name when converting between
\nnon-sparse<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-21533","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/21533","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=21533"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=21533"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=21533"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}