In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
scsi: target: iscsi: Bound iscsi_encode_text_output() appends to rsp_buf<\/p>\n
iscsi_encode_text_output() concatenates “key=value” records into
\nlogin->rsp_buf, an 8192-byte kzalloc(MAX_KEY_VALUE_PAIRS) buffer
\nallocated in iscsit_alloc_login_setup_buffer(). The three sprintf() call
\nsites in this function (lines 1398, 1411, 1424 in v7.1-rc2) never check
\nthe remaining buffer capacity:<\/p>\n
\t*length += sprintf(output_buf, “%s=%s”, er->key, er->value);
\n\t*length += 1;
\n\toutput_buf = textbuf + *length;<\/p>\n
The 8192-byte ceiling at iscsi_target_check_login_request() bounds the
\n*input* Login PDU payload, but a single PDU can carry up to 2048 minimal
\nfour-byte “a=b” pairs, each unknown key expanding to a 16-byte
\n“a=NotUnderstood” output record via iscsi_add_notunderstood_response().
\n2048 * 16 = 32 KiB of output into an 8 KiB buffer, producing a ~24 KiB
\nheap overrun in the kmalloc-8k slab.<\/p>\n
The fix introduces a static iscsi_encode_text_record() helper that uses
\nsnprintf() with a per-call bounds check against the remaining buffer,
\nand threads a u32 textbuf_size parameter through
\niscsi_encode_text_output(). Both call sites in
\niscsi_target_handle_csg_zero() (PHASE_SECURITY) and
\niscsi_target_handle_csg_one() (PHASE_OPERATIONAL) pass
\nMAX_KEY_VALUE_PAIRS. On overflow the encoder logs the condition, calls
\niscsi_release_extra_responses() to drop queued records, and returns -1;
\nboth caller sites now emit ISCSI_STATUS_CLS_INITIATOR_ERR \/
\nISCSI_LOGIN_STATUS_INIT_ERR via iscsit_tx_login_rsp() before returning,
\nso the initiator sees an explicit failed-login response rather than a
\nsilent connection drop. (Prior to this patch only the PHASE_OPERATIONAL
\ncaller did that; the PHASE_SECURITY caller is converted to the same
\nshape.)<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
scsi: target: iscsi: Bound iscsi_encode_text_output() appends to rsp_buf<\/p>\n
iscsi_encode_text_output() concatenates “key=value” rec<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-14941","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/14941","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=14941"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=14941"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=14941"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}