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| author | Vasiliy Kulikov <segoon@openwall.com> | 2011-03-15 13:36:05 +0100 |
|---|---|---|
| committer | Paul Gortmaker <paul.gortmaker@windriver.com> | 2011-06-26 12:47:21 -0400 |
| commit | 1d9064bb2d8f0ea26a67b2ce74c6d1d461dcfe7d (patch) | |
| tree | 181f7a1056edeeaddd4bd96aa7933894ae40ba34 | |
| parent | f1f486501fa9b401c762b2355a238cf9e7f18385 (diff) | |
| download | linux-rt-1d9064bb2d8f0ea26a67b2ce74c6d1d461dcfe7d.tar.gz | |
netfilter: ip_tables: fix infoleak to userspace
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: Paul Gortmaker <paul.gortmaker@windriver.com>
| -rw-r--r-- | net/ipv4/netfilter/ip_tables.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/net/ipv4/netfilter/ip_tables.c b/net/ipv4/netfilter/ip_tables.c index b29c66df8d1f..c89ac490657b 100644 --- a/net/ipv4/netfilter/ip_tables.c +++ b/net/ipv4/netfilter/ip_tables.c @@ -1294,6 +1294,7 @@ do_replace(struct net *net, const 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) @@ -1838,6 +1839,7 @@ compat_do_replace(struct net *net, void __user *user, unsigned int len) 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) @@ -2067,6 +2069,7 @@ do_ipt_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) ret = -EFAULT; break; } + rev.name[sizeof(rev.name)-1] = 0; if (cmd == IPT_SO_GET_REVISION_TARGET) target = 1; |