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From 2bfa25e55c0a49bc079e5769db2199989eda7745 Mon Sep 17 00:00:00 2001
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From: Jon Maloy <jmaloy@redhat.com>
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Date: Fri, 11 Dec 2020 00:59:26 -0500
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Subject: [PATCH 03/14] slirp: check pkt_len before reading protocol header
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: Jon Maloy <jmaloy@redhat.com>
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Message-id: <20201211005926.618830-2-jmaloy@redhat.com>
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Patchwork-id: 100398
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O-Subject: [RHEL-8.4.0 qemu-kvm PATCH 1/1] slirp: check pkt_len before reading protocol header
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Bugzilla: 1902237
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RH-Acked-by: Danilo de Paula <ddepaula@redhat.com>
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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RH-Acked-by: Marc-André Lureau <marcandre.lureau@redhat.com>
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While processing ARP/NCSI packets in 'arp_input' or 'ncsi_input'
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routines, ensure that pkt_len is large enough to accommodate the
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respective protocol headers, lest it should do an OOB access.
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Add check to avoid it.
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CVE-2020-29129 CVE-2020-29130
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QEMU: slirp: out-of-bounds access while processing ARP/NCSI packets
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-> https://www.openwall.com/lists/oss-security/2020/11/27/1
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Reported-by: Qiuhao Li <Qiuhao.Li@outlook.com>
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Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
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Message-Id: <20201126135706.273950-1-ppandit@redhat.com>
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Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
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(cherry picked from libslirp commit 2e1dcbc0c2af64fcb17009eaf2ceedd81be2b27f)
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Signed-off-by: Jon Maloy <jmaloy@redhat.com>
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Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
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---
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slirp/src/ncsi.c | 4 ++++
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slirp/src/slirp.c | 4 ++++
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2 files changed, 8 insertions(+)
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diff --git a/slirp/src/ncsi.c b/slirp/src/ncsi.c
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index 6864b735db4..251c0d2bfbb 100644
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--- a/slirp/src/ncsi.c
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+++ b/slirp/src/ncsi.c
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@@ -147,6 +147,10 @@ void ncsi_input(Slirp *slirp, const uint8_t *pkt, int pkt_len)
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uint32_t checksum;
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uint32_t *pchecksum;
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+ if (pkt_len < ETH_HLEN + sizeof(struct ncsi_pkt_hdr)) {
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+ return; /* packet too short */
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+ }
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+
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memset(ncsi_reply, 0, sizeof(ncsi_reply));
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memset(reh->h_dest, 0xff, ETH_ALEN);
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diff --git a/slirp/src/slirp.c b/slirp/src/slirp.c
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index b0194cb32bb..86b0f52d923 100644
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--- a/slirp/src/slirp.c
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+++ b/slirp/src/slirp.c
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@@ -700,6 +700,10 @@ static void arp_input(Slirp *slirp, const uint8_t *pkt, int pkt_len)
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return;
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}
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+ if (pkt_len < ETH_HLEN + sizeof(struct slirp_arphdr)) {
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+ return; /* packet too short */
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+ }
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+
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ar_op = ntohs(ah->ar_op);
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switch (ar_op) {
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case ARPOP_REQUEST:
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--
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2.27.0
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