38 lines
1.3 KiB
Diff
38 lines
1.3 KiB
Diff
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From d4ead6bc0b2f0d4682661837d202502127060476 Mon Sep 17 00:00:00 2001
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From: Donald Sharp <sharpd@nvidia.com>
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Date: Thu, 23 Feb 2023 13:29:32 -0500
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Subject: [PATCH] bgpd: Flowspec overflow issue
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Upstream: yes
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CVE-2023-38406,bsc#1216900,https://github.com/FRRouting/frr/pull/12884/commits/0b999c886e241c52bd1f7ef0066700e4b618ebb3
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According to the flowspec RFC 8955 a flowspec nlri is <length, <nlri data>>
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Specifying 0 as a length makes BGP get all warm on the inside. Which
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in this case is not a good thing at all. Prevent warmth, stay cold
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on the inside.
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Reported-by: Iggy Frankovic <iggyfran@amazon.com>
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Signed-off-by: Donald Sharp <sharpd@nvidia.com>
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Signed-off-by: Marius Tomaschewski <mt@suse.com>
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diff --git a/bgpd/bgp_flowspec.c b/bgpd/bgp_flowspec.c
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index fe1f0d50f8..98ec1ed073 100644
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--- a/bgpd/bgp_flowspec.c
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+++ b/bgpd/bgp_flowspec.c
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@@ -148,6 +148,13 @@ int bgp_nlri_parse_flowspec(struct peer *peer, struct attr *attr,
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psize);
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return BGP_NLRI_PARSE_ERROR_PACKET_OVERFLOW;
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}
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+
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+ if (psize == 0) {
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+ flog_err(EC_BGP_FLOWSPEC_PACKET,
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+ "Flowspec NLRI length 0 which makes no sense");
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+ return BGP_NLRI_PARSE_ERROR_PACKET_OVERFLOW;
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+ }
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+
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if (bgp_fs_nlri_validate(pnt, psize, afi) < 0) {
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flog_err(
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EC_BGP_FLOWSPEC_PACKET,
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--
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2.35.3
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