In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
smb: client: fix OOB read\/write from unvalidated DataOffset in coalesce_t2()<\/p>\n
coalesce_t2() computes data pointers directly from server-supplied
\nDataOffset fields with no validation against buffer bounds:<\/p>\n
data_area_of_tgt = (char *)&pSMBt->hdr.Protocol +
\n get_unaligned_le16(&pSMBt->t2_rsp.DataOffset);
\n data_area_of_src = (char *)&pSMBs->hdr.Protocol +
\n get_unaligned_le16(&pSMBs->t2_rsp.DataOffset);
\n data_area_of_tgt += total_in_tgt;
\n …
\n memcpy(data_area_of_tgt, data_area_of_src, total_in_src);<\/p>\n
A small DataOffset can push a pointer below the actual byte area,
\noverwriting header fields; a large one can push it past the buffer
\nend, causing out-of-bounds heap reads (source) or writes (target).
\nThe BCC overflow guard does not prevent this: BCC reflects how much
\ndata is present, while DataOffset controls where in the buffer it
\nstarts.<\/p>\n
The “validate target area” comment present since the function was
\nfirst written in 2005 was a placeholder that was never implemented.<\/p>\n
Add lower- and upper-bound checks for both data pointers before the
\nmemcpy, and before any target header fields are modified.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
smb: client: fix OOB read\/write from unvalidated DataOffset in coalesce_t2()<\/p>\n
coalesce_t2() computes data pointers directly from se<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-21555","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/21555","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=21555"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=21555"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=21555"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}