In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
smb: client: restore the data_offset bound in is_valid_oplock_break()<\/p>\n
Commit 83bfbd0bb902 (“cifs: Remove the RFC1002 header from smb_hdr”)
\nchanged the quantity this bound is measured against. It used to be
\nsrv->total_read minus the 4-byte RFC1002 preamble that total_read then
\nincluded, so it was the SMB message length. The same commit stopped
\ncounting the preamble, and the mechanical substitution to
\nsrv->total_read – srv->pdu_size left an expression that is identically
\nzero: standard_receive3() reads MID_HEADER_SIZE() bytes and then exactly
\npdu_length – MID_HEADER_SIZE() more, adding both to total_read.<\/p>\n
len is therefore 0, the subtraction below it wraps, and no __u32
\nDataOffset can exceed the result, so the check from commit 097f5863b1a0
\n(“cifs: read overflow in is_valid_oplock_break()”) no longer rejects
\nanything. Use total_read, which is now the message length on its own.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
smb: client: restore the data_offset bound in is_valid_oplock_break()<\/p>\n
Commit 83bfbd0bb902 (“cifs: Remove the RFC1002 header from s<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-21552","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/21552","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=21552"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=21552"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=21552"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}