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Accepting request 1088895 from home:mtomaschewski:branches:network

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- Apply upstream fix for denial of service via the bgp_capability_llgr()
  function (bsc#1211248,CVE-2023-31489,gh#FRRouting/frr#13098).
  [+ 0006-bgpd-Check-7-bytes-for-Long-lived-Graceful-Restart-c.patch]
- Apply upstream fix for denial of service via the bgp_attr_psid_sub()
  function (bsc#1211249,CVE-2023-31490,gh#FRRouting/frr#13099).
  [+ 0007-bgpd-Ensure-stream-received-has-enough-data.patch]

OBS-URL: https://build.opensuse.org/request/show/1088895
OBS-URL: https://build.opensuse.org/package/show/network/frr?expand=0&rev=49
This commit is contained in:
Marcus Meissner 2023-06-01 10:02:15 +00:00 committed by Git OBS Bridge
parent addf7abe6b
commit 694815f1d3
4 changed files with 217 additions and 0 deletions
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48
0006-bgpd-Check-7-bytes-for-Long-lived-Graceful-Restart-c.patch Normal file
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@ -0,0 +1,48 @@
From d95229c9ba4c8ff99dfc644dd2d1e9e172fe3faf Mon Sep 17 00:00:00 2001
From: Donatas Abraitis <donatas@opensourcerouting.org>
Date: Fri, 24 Mar 2023 09:55:23 +0200
Upstream: yes
References: bsc#1211248,CVE-2023-31489,https://github.com/FRRouting/frr/pull/13100/commits/b1d33ec293e8e36fbb8766252f3b016d268e31ce
Subject: [PATCH] bgpd: Check 7 bytes for Long-lived Graceful-Restart
capability
It's not 4 bytes, it was assuming the same as Graceful-Restart tuples.
LLGR has more 3 bytes (Long-lived Stale Time).
Signed-off-by: Donatas Abraitis <donatas@opensourcerouting.org>
Signed-off-by: Marius Tomaschewski <mt@suse.com>
diff --git a/bgpd/bgp_open.c b/bgpd/bgp_open.c
index d1667fac26..907e75e76b 100644
--- a/bgpd/bgp_open.c
+++ b/bgpd/bgp_open.c
@@ -599,12 +599,24 @@ static int bgp_capability_restart(struct peer *peer,
static int bgp_capability_llgr(struct peer *peer,
struct capability_header *caphdr)
{
+/*
+ * +--------------------------------------------------+
+ * | Address Family Identifier (16 bits) |
+ * +--------------------------------------------------+
+ * | Subsequent Address Family Identifier (8 bits) |
+ * +--------------------------------------------------+
+ * | Flags for Address Family (8 bits) |
+ * +--------------------------------------------------+
+ * | Long-lived Stale Time (24 bits) |
+ * +--------------------------------------------------+
+ */
+#define BGP_CAP_LLGR_MIN_PACKET_LEN 7
struct stream *s = BGP_INPUT(peer);
size_t end = stream_get_getp(s) + caphdr->length;
SET_FLAG(peer->cap, PEER_CAP_LLGR_RCV);
- while (stream_get_getp(s) + 4 <= end) {
+ while (stream_get_getp(s) + BGP_CAP_LLGR_MIN_PACKET_LEN <= end) {
afi_t afi;
safi_t safi;
iana_afi_t pkt_afi = stream_getw(s);
--
2.35.3

155
0007-bgpd-Ensure-stream-received-has-enough-data.patch Normal file
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@ -0,0 +1,155 @@
From 6d307ec2f5f5f9827f340a08941e6f78d09d1876 Mon Sep 17 00:00:00 2001
From: Donald Sharp <sharpd@nvidia.com>
Date: Tue, 6 Dec 2022 10:23:11 -0500
Upstream: yes
References: bsc#1211249,CVE-2023-31490,https://github.com/FRRouting/frr/pull/12454/commits/06431bfa7570f169637ebb5898f0b0cc3b010802
Subject: [PATCH] bgpd: Ensure stream received has enough data
BGP_PREFIX_SID_SRV6_L3_SERVICE attributes must not
fully trust the length value specified in the nlri.
Always ensure that the amount of data we need to read
can be fullfilled.
Reported-by: Iggy Frankovic <iggyfran@amazon.com>
Signed-off-by: Donald Sharp <sharpd@nvidia.com>
Signed-off-by: Marius Tomaschewski <mt@suse.com>
diff --git a/bgpd/bgp_attr.c b/bgpd/bgp_attr.c
index b7d0958bac..c6177a1b93 100644
--- a/bgpd/bgp_attr.c
+++ b/bgpd/bgp_attr.c
@@ -2748,9 +2748,21 @@ bgp_attr_psid_sub(uint8_t type, uint16_t length,
uint8_t sid_type, sid_flags;
char buf[BUFSIZ];
+ /*
+ * Check that we actually have at least as much data as
+ * specified by the length field
+ */
+ if (STREAM_READABLE(peer->curr) < length) {
+ flog_err(
+ EC_BGP_ATTR_LEN,
+ "Prefix SID specifies length %hu, but only %zu bytes remain",
+ length, STREAM_READABLE(peer->curr));
+ return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR,
+ args->total);
+ }
+
if (type == BGP_PREFIX_SID_LABEL_INDEX) {
- if (STREAM_READABLE(peer->curr) < length
- || length != BGP_PREFIX_SID_LABEL_INDEX_LENGTH) {
+ if (length != BGP_PREFIX_SID_LABEL_INDEX_LENGTH) {
flog_err(EC_BGP_ATTR_LEN,
"Prefix SID label index length is %hu instead of %u",
length, BGP_PREFIX_SID_LABEL_INDEX_LENGTH);
@@ -2772,12 +2784,8 @@ bgp_attr_psid_sub(uint8_t type, uint16_t length,
/* Store label index; subsequently, we'll check on
* address-family */
attr->label_index = label_index;
- }
-
- /* Placeholder code for the IPv6 SID type */
- else if (type == BGP_PREFIX_SID_IPV6) {
- if (STREAM_READABLE(peer->curr) < length
- || length != BGP_PREFIX_SID_IPV6_LENGTH) {
+ } else if (type == BGP_PREFIX_SID_IPV6) {
+ if (length != BGP_PREFIX_SID_IPV6_LENGTH) {
flog_err(EC_BGP_ATTR_LEN,
"Prefix SID IPv6 length is %hu instead of %u",
length, BGP_PREFIX_SID_IPV6_LENGTH);
@@ -2791,10 +2799,7 @@ bgp_attr_psid_sub(uint8_t type, uint16_t length,
stream_getw(peer->curr);
stream_get(&ipv6_sid, peer->curr, 16);
- }
-
- /* Placeholder code for the Originator SRGB type */
- else if (type == BGP_PREFIX_SID_ORIGINATOR_SRGB) {
+ } else if (type == BGP_PREFIX_SID_ORIGINATOR_SRGB) {
/*
* ietf-idr-bgp-prefix-sid-05:
* Length is the total length of the value portion of the
@@ -2819,19 +2824,6 @@ bgp_attr_psid_sub(uint8_t type, uint16_t length,
args->total);
}
- /*
- * Check that we actually have at least as much data as
- * specified by the length field
- */
- if (STREAM_READABLE(peer->curr) < length) {
- flog_err(EC_BGP_ATTR_LEN,
- "Prefix SID Originator SRGB specifies length %hu, but only %zu bytes remain",
- length, STREAM_READABLE(peer->curr));
- return bgp_attr_malformed(
- args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR,
- args->total);
- }
-
/*
* Check that the portion of the TLV containing the sequence of
* SRGBs corresponds to a multiple of the SRGB size; to get
@@ -2855,12 +2847,8 @@ bgp_attr_psid_sub(uint8_t type, uint16_t length,
stream_get(&srgb_base, peer->curr, 3);
stream_get(&srgb_range, peer->curr, 3);
}
- }
-
- /* Placeholder code for the VPN-SID Service type */
- else if (type == BGP_PREFIX_SID_VPN_SID) {
- if (STREAM_READABLE(peer->curr) < length
- || length != BGP_PREFIX_SID_VPN_SID_LENGTH) {
+ } else if (type == BGP_PREFIX_SID_VPN_SID) {
+ if (length != BGP_PREFIX_SID_VPN_SID_LENGTH) {
flog_err(EC_BGP_ATTR_LEN,
"Prefix SID VPN SID length is %hu instead of %u",
length, BGP_PREFIX_SID_VPN_SID_LENGTH);
@@ -2896,39 +2884,22 @@ bgp_attr_psid_sub(uint8_t type, uint16_t length,
attr->srv6_vpn->sid_flags = sid_flags;
sid_copy(&attr->srv6_vpn->sid, &ipv6_sid);
attr->srv6_vpn = srv6_vpn_intern(attr->srv6_vpn);
- }
-
- /* Placeholder code for the SRv6 L3 Service type */
- else if (type == BGP_PREFIX_SID_SRV6_L3_SERVICE) {
- if (STREAM_READABLE(peer->curr) < length) {
+ } else if (type == BGP_PREFIX_SID_SRV6_L3_SERVICE) {
+ if (STREAM_READABLE(peer->curr) < 1) {
flog_err(
EC_BGP_ATTR_LEN,
- "Prefix SID SRv6 L3-Service length is %hu, but only %zu bytes remain",
- length, STREAM_READABLE(peer->curr));
- return bgp_attr_malformed(args,
- BGP_NOTIFY_UPDATE_ATTR_LENG_ERR,
- args->total);
+ "Prefix SID SRV6 L3 Service not enough data left, it must be at least 1 byte");
+ return bgp_attr_malformed(
+ args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR,
+ args->total);
}
-
/* ignore reserved */
stream_getc(peer->curr);
return bgp_attr_srv6_service(args);
}
-
/* Placeholder code for Unsupported TLV */
else {
-
- if (STREAM_READABLE(peer->curr) < length) {
- flog_err(
- EC_BGP_ATTR_LEN,
- "Prefix SID SRv6 length is %hu - too long, only %zu remaining in this UPDATE",
- length, STREAM_READABLE(peer->curr));
- return bgp_attr_malformed(
- args, BGP_NOTIFY_UPDATE_ATTR_LENG_ERR,
- args->total);
- }
-
if (bgp_debug_update(peer, NULL, NULL, 1))
zlog_debug(
"%s attr Prefix-SID sub-type=%u is not supported, skipped",
--
2.35.3

10
frr.changes
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@ -1,3 +1,13 @@
-------------------------------------------------------------------
Mon May 15 08:01:39 UTC 2023 - Marius Tomaschewski <mt@suse.com>
- Apply upstream fix for denial of service via the bgp_capability_llgr()
function (bsc#1211248,CVE-2023-31489,gh#FRRouting/frr#13098).
[+ 0006-bgpd-Check-7-bytes-for-Long-lived-Graceful-Restart-c.patch]
- Apply upstream fix for denial of service via the bgp_attr_psid_sub()
function (bsc#1211249,CVE-2023-31490,gh#FRRouting/frr#13099).
[+ 0007-bgpd-Ensure-stream-received-has-enough-data.patch]
-------------------------------------------------------------------
Mon Apr 3 14:00:27 UTC 2023 - Marius Tomaschewski <mt@suse.com>

4
frr.spec
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@ -44,6 +44,8 @@ Patch2: harden_frr.service.patch
Patch3: 0003-tools-Run-as-FRR_USER-install-chown-commands-to-avoi.patch
Patch4: 0004-tools-remove-backslash-from-declare-check-regex.patch
Patch5: 0005-root-ok-in-account-frr.pam.patch
Patch6: 0006-bgpd-Check-7-bytes-for-Long-lived-Graceful-Restart-c.patch
Patch7: 0007-bgpd-Ensure-stream-received-has-enough-data.patch
BuildRequires: autoconf
BuildRequires: automake
BuildRequires: bison >= 2.7
@ -187,6 +189,8 @@ developing OSPF-API and frr applications.
%patch3 -p1
%patch4 -p1
%patch5 -p1
%patch6 -p1
%patch7 -p1
%build
# GCC LTO objects must be "fat" to avoid assembly errors