In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
net: ip_gre: require CAP_NET_ADMIN in the device netns for changelink<\/p>\n
A tunnel changelink() operates on at most two netns, dev_net(dev) and
\nthe tunnel link netns t->net. They differ once the device is created in
\nor moved to a netns other than the one the request runs in. The rtnl
\nchangelink path checks CAP_NET_ADMIN only against dev_net(dev), so a
\ncaller privileged there but not in t->net can rewrite a tunnel that
\nlives in t->net.<\/p>\n
Add rtnl_dev_link_net_capable() next to rtnl_get_net_ns_capable() in
\nnet\/core\/rtnetlink.c. It requires CAP_NET_ADMIN in the link netns and is
\nskipped when the link netns is dev_net(dev), where the rtnl path already
\nchecked it. The other patches in this series use the same helper.<\/p>\n
Gate ipgre_changelink() and erspan_changelink() with it, at the top of
\nthe op before any attribute is parsed, because the parsers update live
\ntunnel fields first. ipgre_netlink_parms() sets t->collect_md before
\nip_tunnel_changelink() runs.<\/p>\n
Commit 8b484efd5cb4 (“ip6: vti: Use ip6_tnl.net in
\nvti6_siocdevprivate().”) added the same check on the ioctl path. This
\nadds it on RTM_NEWLINK.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
net: ip_gre: require CAP_NET_ADMIN in the device netns for changelink<\/p>\n
A tunnel changelink() operates on at most two netns, dev_net<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-14900","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/14900","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=14900"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=14900"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=14900"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}