Messages in this thread Patch in this message | | | Date | Wed, 13 Apr 2011 08:51:05 -0700 | From | Greg KH <> | Subject | [41/74] netfilter: ip_tables: fix infoleak to userspace |
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2.6.32-longterm review patch. If anyone has any objections, please let us know.
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From: Vasiliy Kulikov <segoon@openwall.com>
commit 78b79876761b86653df89c48a7010b5cbd41a84a upstream.
Structures ipt_replace, compat_ipt_replace, and xt_get_revision are copied from userspace. Fields of these structs that are zero-terminated strings are not checked. When they are used as argument to a format string containing "%s" in request_module(), some sensitive information is leaked to userspace via argument of spawned modprobe process.
The first and the third bugs were introduced before the git epoch; the second was introduced in 2722971c (v2.6.17-rc1). To trigger the bug one should have CAP_NET_ADMIN.
Signed-off-by: Vasiliy Kulikov <segoon@openwall.com> Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
--- net/ipv4/netfilter/ip_tables.c | 3 +++ 1 file changed, 3 insertions(+)
--- a/net/ipv4/netfilter/ip_tables.c +++ b/net/ipv4/netfilter/ip_tables.c @@ -1290,6 +1290,7 @@ do_replace(struct net *net, void __user /* overflow check */ if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) return -ENOMEM; + tmp.name[sizeof(tmp.name)-1] = 0; newinfo = xt_alloc_table_info(tmp.size); if (!newinfo) @@ -1820,6 +1821,7 @@ compat_do_replace(struct net *net, void return -ENOMEM; if (tmp.num_counters >= INT_MAX / sizeof(struct xt_counters)) return -ENOMEM; + tmp.name[sizeof(tmp.name)-1] = 0; newinfo = xt_alloc_table_info(tmp.size); if (!newinfo) @@ -2044,6 +2046,7 @@ do_ipt_get_ctl(struct sock *sk, int cmd, ret = -EFAULT; break; } + rev.name[sizeof(rev.name)-1] = 0; if (cmd == IPT_SO_GET_REVISION_TARGET) target = 1;
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