In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
netfilter: ip6t_rt: fix zero-address non-strict match out-of-bounds read<\/p>\n
rt_mt6_check() permits rules to be configured with rtinfo->addrnr == 0
\neven when address matching (IP6T_RT_FST_MASK) is requested.<\/p>\n
In the IP6T_RT_FST_NSTRICT path, rt_mt6() evaluates packet routing
\naddresses against rtinfo->addrs[i] and terminates backwards at the bottom
\nof the loop:<\/p>\n
if (ipv6_addr_equal(ap, &rtinfo->addrs[i])) {
\n i++;
\n }
\n if (i == rtinfo->addrnr)
\n break;<\/p>\n
When addrnr is 0, if the first packet address matches rtinfo->addrs[0],
\ni is incremented to 1. Because i is now strictly greater than addrnr (0),
\nthe loop termination condition (i == rtinfo->addrnr) is bypassed and will
\nnever be satisfied.<\/p>\n
If a crafted IPv6 packet contains matching routing addresses, i will
\nadvance past IP6T_RT_HOPS (16). The subsequent call to ipv6_addr_equal()
\nreads beyond struct ip6t_rt, triggering UBSAN\/KASAN out-of-bounds warnings
\nor kernel panics.<\/p>\n
Fix this by:
\n1. Rejecting rules in rt_mt6_check() where IP6T_RT_FST_MASK is set but
\n rtinfo->addrnr is zero.
\n2. In rt_mt6(), moving the termination condition (i addrnr)
\n into the for-loop header condition and removing the backwards break
\n at the end of the loop body.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
netfilter: ip6t_rt: fix zero-address non-strict match out-of-bounds read<\/p>\n
rt_mt6_check() permits rules to be configured with rtinfo<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-40957","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/40957","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=40957"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=40957"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=40957"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}