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Steve Grubb writes: 

Hello,

Last November a bug was found in iproute. CAN-2003-0856 has more information.
Basically, netlink packets can come from any user. If a program performs action
based on netlink packets, they must be examined to make sure they came from the
place they are expected (the kernel).

Attached is a patch against pre8. Please apply this before releasing 1.00 final.
All users of busy box may be vulnerable to local attacks without it.

Best Regards,
Steve Grubb
1_00_stable_10817
Eric Andersen 2004-05-05 07:05:32 +00:00
parent 5ec58285c3
commit 6c8161d69f
1 changed files with 4 additions and 2 deletions
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6
networking/libiproute/libnetlink.c
View File

@ -161,7 +161,8 @@ int rtnl_dump_filter(struct rtnl_handle *rth,
while (NLMSG_OK(h, status)) { while (NLMSG_OK(h, status)) {
int err; int err;
if (h->nlmsg_pid != rth->local.nl_pid || if (nladdr.nl_pid != 0 ||
h->nlmsg_pid != rth->local.nl_pid ||
h->nlmsg_seq != rth->dump) { h->nlmsg_seq != rth->dump) {
if (junk) { if (junk) {
err = junk(&nladdr, h, arg2); err = junk(&nladdr, h, arg2);
@ -270,7 +271,8 @@ int rtnl_talk(struct rtnl_handle *rtnl, struct nlmsghdr *n, pid_t peer,
bb_error_msg_and_die("!!!malformed message: len=%d", len); bb_error_msg_and_die("!!!malformed message: len=%d", len);
} }
if (h->nlmsg_pid != rtnl->local.nl_pid || if (nladdr.nl_pid != peer ||
h->nlmsg_pid != rtnl->local.nl_pid ||
h->nlmsg_seq != seq) { h->nlmsg_seq != seq) {
if (junk) { if (junk) {
l_err = junk(&nladdr, h, jarg); l_err = junk(&nladdr, h, jarg);