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authorVasiliy Kulikov <segoon@openwall.com>2011-03-15 13:35:21 +0100
committerGreg Kroah-Hartman <gregkh@suse.de>2011-04-14 16:53:35 -0700
commitbf9717776581e3000f899fd0172d1eb448ab2679 (patch)
tree44f401fa2f726cb6e820c69b0521f5370ff4669c /net
parent3be5e2ffddca4470b1be87ceb2868a59a3de9206 (diff)
netfilter: arp_tables: fix infoleak to userspace
commit 42eab94fff18cb1091d3501cd284d6bd6cc9c143 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 bug was introduced before the git epoch; the second is introduced by 6b7d31fc (v2.6.15-rc1); the third is introduced by 6b7d31fc (v2.6.15-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>
Diffstat (limited to 'net')
-rw-r--r--net/ipv4/netfilter/arp_tables.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/net/ipv4/netfilter/arp_tables.c b/net/ipv4/netfilter/arp_tables.c
index 98442f3063e8..c8b0cc35d148 100644
--- a/net/ipv4/netfilter/arp_tables.c
+++ b/net/ipv4/netfilter/arp_tables.c
@@ -1086,6 +1086,7 @@ static int do_replace(struct net *net, void __user *user, unsigned int len)
/* 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)
@@ -1508,6 +1509,7 @@ static int compat_do_replace(struct net *net, void __user *user,
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)
@@ -1763,6 +1765,7 @@ static int do_arpt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len
ret = -EFAULT;
break;
}
+ rev.name[sizeof(rev.name)-1] = 0;
try_then_request_module(xt_find_revision(NFPROTO_ARP, rev.name,
rev.revision, 1, &ret),