In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
scsi: target: iscsi: Reserve a terminator byte for the login payload<\/p>\n
iscsi_target_check_login_request() rejects a login PDU whose
\nDataSegmentLength exceeds MAX_KEY_VALUE_PAIRS, but the test is ‘>’ and
\nlogin->req_buf is allocated with exactly MAX_KEY_VALUE_PAIRS
\nbytes. Since iscsit_get_login_rx() receives payload_length + padding
\nbytes, where<\/p>\n
\tpadding = ((-payload_length) & 3);<\/p>\n
any payload_length from 8189 to 8192 fills the whole 8192 byte
\nbuffer. The write stays in bounds, but no byte is left for a NUL
\nterminator.<\/p>\n
The buffer is subsequently consumed as a C string. In the CHAP path
\nchap_check_algorithm() calls kstrdup(a_str), and extract_param() calls
\nstrstr(in_buf, pattern) followed by strlen_semi(), none of which take a
\nlength. convert_null_to_semi() additionally rewrites every embedded NUL
\nto ‘;’, so even a payload made of well formed NUL separated key=value
\nrecords is left without a terminator. These walk past the end of the
\nobject into adjacent slab memory. It is reachable by an unauthenticated
\ninitiator against a portal configured for CHAP; when authentication is
\nnot required iscsi_login_zero_tsih_s2() rewrites AuthMethod to None and
\nthe CHAP path is never entered.<\/p>\n
Allocate one extra byte. kzalloc() zeroes it and nothing ever writes to
\nit, as every writer copies to offset 0 for at most MAX_KEY_VALUE_PAIRS
\nbytes, so the buffer is always terminated.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
scsi: target: iscsi: Reserve a terminator byte for the login payload<\/p>\n
iscsi_target_check_login_request() rejects a login PDU whose<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-24699","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/24699","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=24699"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=24699"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=24699"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}