In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
NFSv4\/pNFS: reject zero-length r_addr in nfs4_decode_mp_ds_addr<\/p>\n
nfs4_decode_mp_ds_addr() decodes the r_netid and r_addr opaques of a
\nnetaddr4 from a GETDEVICEINFO multipath-DS body, then immediately
\ncalls strrchr(buf, ‘.’) to locate the port separator. Both decodes
\nuse xdr_stream_decode_string_dup(), and the current code checks only
\n“nlen < 0" \/ "rlen < 0" before dereferencing the returned string.<\/p>\n
When the on-wire opaque has length zero, xdr_stream_decode_opaque_inline()
\nreturns 0 and xdr_stream_decode_string_dup() falls through to its
\n"*str = NULL; return ret" tail, leaving buf NULL with a return value
\nof 0. The "< 0" check does not catch this, and the next line is
\nstrrchr(NULL, '.'), a kernel NULL pointer dereference reachable from
\nany pNFS-flexfile client mounted against a malicious or compromised
\nmetadata server.<\/p>\n
Reject the zero-length cases explicitly so the decoder fails with
\n-EBADMSG (treated as a malformed GETDEVICEINFO body) instead of
\npanicking the client.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
NFSv4\/pNFS: reject zero-length r_addr in nfs4_decode_mp_ds_addr<\/p>\n
nfs4_decode_mp_ds_addr() decodes the r_netid and r_addr opaques of<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-14860","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/14860","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=14860"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=14860"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=14860"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}