In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
RDMA\/srp: fix heap information leak on a truncated SRP_CRED_REQ<\/p>\n
srp_recv_done() passes wc->byte_len to srp_process_rsp(). It passes
\nnothing to srp_process_cred_req() and srp_process_aer_req(), which read
\nfixed-size fields from the receive buffer without checking that those
\nfields were received.<\/p>\n
The buffer size is max_ti_iu_len, which comes from the login response
\nand is not validated. A target that advertises 8 and then sends an
\n8-byte SRP_CRED_REQ makes the initiator read req->tag from beyond the
\nend of the buffer. req->tag is copied into the SRP_CRED_RSP and sent
\nback, so those bytes reach the target. SRP_AER_REQ behaves the same way
\nand also reads req->lun.<\/p>\n
The leak is 8 bytes per response. max_ti_iu_len also decides which slab
\ncache the buffer comes from. With 8 the buffer is a kmalloc-8 object and
\nthe read is entirely outside it:<\/p>\n
BUG: KASAN: slab-out-of-bounds in srp_recv_done+0x172b\/0x1aa0
\n Read of size 8 at addr ffff888104714da8 by task kworker\/u8:3\/50
\n which belongs to the cache kmalloc-8 of size 8
\n The buggy address is located 0 bytes to the right of
\n allocated 8-byte region [ffff888104714da0, ffff888104714da8)<\/p>\n
Without KASAN the returned bytes are whatever is next in the slab. One
\nrun returned “.strtab”.<\/p>\n
rsp->data[3] in srp_process_rsp() has the same problem: only
\nresp_data_len is checked before it is read.<\/p>\n
Drop a request that is shorter than the structure being parsed, and
\ncheck byte_len before the tsk_mgmt read.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
RDMA\/srp: fix heap information leak on a truncated SRP_CRED_REQ<\/p>\n
srp_recv_done() passes wc->byte_len to srp_process_rsp(). It passe<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-25716","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/25716","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=25716"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=25716"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=25716"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}