From patchwork Mon Jul 4 16:27:38 2011 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Paolo Pisati X-Patchwork-Id: 103138 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from chlorine.canonical.com (chlorine.canonical.com [91.189.94.204]) by ozlabs.org (Postfix) with ESMTP id B4782B6F6B for ; Tue, 5 Jul 2011 02:27:54 +1000 (EST) Received: from localhost ([127.0.0.1] helo=chlorine.canonical.com) by chlorine.canonical.com with esmtp (Exim 4.71) (envelope-from ) id 1Qdlzq-0004M4-I5; Mon, 04 Jul 2011 16:27:42 +0000 Received: from adelie.canonical.com ([91.189.90.139]) by chlorine.canonical.com with esmtp (Exim 4.71) (envelope-from ) id 1Qdlzo-0004Lp-Oo for kernel-team@lists.ubuntu.com; Mon, 04 Jul 2011 16:27:40 +0000 Received: from youngberry.canonical.com ([91.189.89.112]) by adelie.canonical.com with esmtp (Exim 4.71 #1 (Debian)) id 1Qdlzo-0001t8-Me for ; Mon, 04 Jul 2011 16:27:40 +0000 Received: from dynamic-adsl-94-36-146-179.clienti.tiscali.it ([94.36.146.179] helo=canonical.com) by youngberry.canonical.com with esmtpsa (TLS1.0:DHE_RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1Qdlzo-0001Y6-Ga for kernel-team@lists.ubuntu.com; Mon, 04 Jul 2011 16:27:40 +0000 From: paolo.pisati@canonical.com To: kernel-team@lists.ubuntu.com Subject: [PATCH 6/6] ipv6: netfilter: ip6_tables: fix infoleak to userspace CVE-2011-1172 Date: Mon, 4 Jul 2011 17:27:38 +0100 Message-Id: <1309796858-2752-2-git-send-email-paolo.pisati@canonical.com> X-Mailer: git-send-email 1.7.4.1 In-Reply-To: <1309796566-2645-1-git-send-email-paolo.pisati@canonical.com> References: <1309796566-2645-1-git-send-email-paolo.pisati@canonical.com> X-BeenThere: kernel-team@lists.ubuntu.com X-Mailman-Version: 2.1.13 Precedence: list List-Id: Kernel team discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: kernel-team-bounces@lists.ubuntu.com Errors-To: kernel-team-bounces@lists.ubuntu.com From: Vasiliy Kulikov BugLink: http://bugs.launchpad.net/bugs/801483 commit upstream 6a8ab060779779de8aea92ce3337ca348f973f54 Structures ip6t_replace, compat_ip6t_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 was introduced in 3bc3fe5e (v2.6.25-rc1); the third is introduced by 6b7d31fc (v2.6.15-rc1). To trigger the bug one should have CAP_NET_ADMIN. CVE-2011-1172 Signed-off-by: Vasiliy Kulikov Signed-off-by: Patrick McHardy Signed-off-by: Paolo Pisati Acked-by: Andy Whitcroft --- net/ipv6/netfilter/ip6_tables.c | 2 ++ 1 files changed, 2 insertions(+), 0 deletions(-) diff --git a/net/ipv6/netfilter/ip6_tables.c b/net/ipv6/netfilter/ip6_tables.c index acaba15..e02284a 100644 --- a/net/ipv6/netfilter/ip6_tables.c +++ b/net/ipv6/netfilter/ip6_tables.c @@ -1047,6 +1047,7 @@ do_replace(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) @@ -1313,6 +1314,7 @@ do_ip6t_get_ctl(struct sock *sk, int cmd, void __user *user, int *len) ret = -EFAULT; break; } + rev.name[sizeof(rev.name)-1] = 0; if (cmd == IP6T_SO_GET_REVISION_TARGET) target = 1;