In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
macsec: fix replay protection at XPN lower-PN wrap<\/p>\n
In macsec_post_decrypt(), when pn is U32_MAX, pn + 1 overflows u32 to 0
\nand the first branch never fires. If next_pn_halves.lower is also in the
\nupper half, pn_same_half(pn, lower) is true and the XPN else-if does not
\nfire either, leaving next_pn_halves unchanged. An attacker that captures
\nthe legitimate frame carrying pn == 0xFFFFFFFF on an XPN association
\ncan then replay it indefinitely, since lowest_pn never rises above
\nthe captured pn and macsec_decrypt() reconstructs the same IV.<\/p>\n
Extend the XPN else-if to also fire when pn + 1 wraps to 0, so receipt
\nof pn == U32_MAX advances next_pn_halves to (upper + 1, 0).<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
macsec: fix replay protection at XPN lower-PN wrap<\/p>\n
In macsec_post_decrypt(), when pn is U32_MAX, pn + 1 overflows u32 to 0
\nand the<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-14963","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/14963","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=14963"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=14963"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=14963"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}