In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
sctp: add INIT verification after cookie unpacking<\/p>\n
In SCTP handshake, the INIT chunk is initially processed by the server
\nand embedded into the cookie carried in INIT-ACK. The client then
\nreturns this cookie via COOKIE-ECHO, where the server unpacks it and
\nreconstructs the original INIT chunk.<\/p>\n
When cookie authentication is enabled, the cookie contents are protected
\nagainst tampering, so reusing the unpacked INIT without re-verification
\nis safe.<\/p>\n
However, when cookie authentication is disabled, the reconstructed INIT
\ncan no longer be trusted. In this case, the INIT must be explicitly
\nvalidated after unpacking to avoid processing potentially tampered data.<\/p>\n
Add sctp_verify_init() checks after cookie unpacking in COOKIE-ECHO
\nprocessing paths (sctp_sf_do_5_1D_ce() and sctp_sf_do_5_2_4_dupcook())
\nwhen cookie_auth_enable is disabled. On failure, the new association is
\nfreed and the packet is discarded.<\/p>\n
Also tighten cookie validation in sctp_unpack_cookie() by verifying the
\nembedded chunk type is SCTP_CID_INIT before treating it as an INIT
\nchunk.<\/p>\n
Finally, update sctp_verify_init() to validate parameter bounds using
\nthe actual embedded INIT length instead of chunk->chunk_end, since the
\nINIT stored in COOKIE-ECHO may not span the entire chunk buffer.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
sctp: add INIT verification after cookie unpacking<\/p>\n
In SCTP handshake, the INIT chunk is initially processed by the server
\nand embe<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-7041","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/7041","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=7041"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=7041"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=7041"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}