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3 Commits

Author SHA1 Message Date
Michal Ruprich
1d5d4bcb87 Resolves: RHEL-14825 - crafted BGP UPDATE message leading to a crash 2024-02-06 01:42:17 +00:00
Michal Ruprich
9eafa3241b Resolves: RHEL-14822 - mishandled malformed data leading to a crash 2024-02-05 09:34:26 +01:00
Michal Ruprich
fe81dd595b Resolves: RHEL-15915 - crash from specially crafted MP_UNREACH_NLRI-containing BGP UPDATE message
Resolves: RHEL-15918 - crash from malformed EOR-containing BGP UPDATE message
2023-12-18 15:27:19 +01:00
3 changed files with 145 additions and 1 deletions

76
0007-CVE-2023-46752.patch Normal file
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@ -0,0 +1,76 @@
From b08afc81c60607a4f736f418f2e3eb06087f1a35 Mon Sep 17 00:00:00 2001
From: Donatas Abraitis <donatas@opensourcerouting.org>
Date: Fri, 20 Oct 2023 17:49:18 +0300
Subject: [PATCH] bgpd: Handle MP_REACH_NLRI malformed packets with session
reset
Avoid crashing bgpd.
Reported-by: Iggy Frankovic <iggyfran@amazon.com>
Signed-off-by: Donatas Abraitis <donatas@opensourcerouting.org>
---
bgpd/bgp_attr.c | 6 +-----
bgpd/bgp_attr.h | 1 -
bgpd/bgp_packet.c | 6 +-----
3 files changed, 2 insertions(+), 11 deletions(-)
diff --git a/bgpd/bgp_attr.c b/bgpd/bgp_attr.c
index 6925aff727e2..e7bb42a5d989 100644
--- a/bgpd/bgp_attr.c
+++ b/bgpd/bgp_attr.c
@@ -2421,7 +2421,7 @@ int bgp_mp_reach_parse(struct bgp_attr_parser_args *args,
mp_update->afi = afi;
mp_update->safi = safi;
- return BGP_ATTR_PARSE_EOR;
+ return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_MAL_ATTR, 0);
}
mp_update->afi = afi;
@@ -3759,10 +3759,6 @@ enum bgp_attr_parse_ret bgp_attr_parse(struct peer *peer, struct attr *attr,
goto done;
}
- if (ret == BGP_ATTR_PARSE_EOR) {
- goto done;
- }
-
if (ret == BGP_ATTR_PARSE_ERROR) {
flog_warn(EC_BGP_ATTRIBUTE_PARSE_ERROR,
"%s: Attribute %s, parse error", peer->host,
diff --git a/bgpd/bgp_attr.h b/bgpd/bgp_attr.h
index 961e5f122470..fc347e7a1b4b 100644
--- a/bgpd/bgp_attr.h
+++ b/bgpd/bgp_attr.h
@@ -364,7 +364,6 @@ enum bgp_attr_parse_ret {
/* only used internally, send notify + convert to BGP_ATTR_PARSE_ERROR
*/
BGP_ATTR_PARSE_ERROR_NOTIFYPLS = -3,
- BGP_ATTR_PARSE_EOR = -4,
BGP_ATTR_PARSE_MISSING_MANDATORY = -5,
};
diff --git a/bgpd/bgp_packet.c b/bgpd/bgp_packet.c
index b585591e2f69..5ecf343b6657 100644
--- a/bgpd/bgp_packet.c
+++ b/bgpd/bgp_packet.c
@@ -2397,8 +2397,7 @@ static int bgp_update_receive(struct peer_connection *connection,
* Non-MP IPv4/Unicast EoR is a completely empty UPDATE
* and MP EoR should have only an empty MP_UNREACH
*/
- if ((!update_len && !withdraw_len && nlris[NLRI_MP_UPDATE].length == 0)
- || (attr_parse_ret == BGP_ATTR_PARSE_EOR)) {
+ if (!update_len && !withdraw_len && nlris[NLRI_MP_UPDATE].length == 0) {
afi_t afi = 0;
safi_t safi;
struct graceful_restart_info *gr_info;
@@ -2419,9 +2418,6 @@ static int bgp_update_receive(struct peer_connection *connection,
&& nlris[NLRI_MP_WITHDRAW].length == 0) {
afi = nlris[NLRI_MP_WITHDRAW].afi;
safi = nlris[NLRI_MP_WITHDRAW].safi;
- } else if (attr_parse_ret == BGP_ATTR_PARSE_EOR) {
- afi = nlris[NLRI_MP_UPDATE].afi;
- safi = nlris[NLRI_MP_UPDATE].safi;
}
if (afi && peer->afc[afi][safi]) {

60
0008-CVE-2023-46753.patch Normal file
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@ -0,0 +1,60 @@
From d8482bf011cb2b173e85b65b4bf3d5061250cdb9 Mon Sep 17 00:00:00 2001
From: Donatas Abraitis <donatas@opensourcerouting.org>
Date: Mon, 23 Oct 2023 23:34:10 +0300
Subject: [PATCH] bgpd: Check mandatory attributes more carefully for UPDATE
message
If we send a crafted BGP UPDATE message without mandatory attributes, we do
not check if the length of the path attributes is zero or not. We only check
if attr->flag is at least set or not. Imagine we send only unknown transit
attribute, then attr->flag is always 0. Also, this is true only if graceful-restart
capability is received.
Reported-by: Iggy Frankovic <iggyfran@amazon.com>
Signed-off-by: Donatas Abraitis <donatas@opensourcerouting.org>
---
bgpd/bgp_attr.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/bgpd/bgp_attr.c b/bgpd/bgp_attr.c
index 26fd3de..bcc4424 100644
--- a/bgpd/bgp_attr.c
+++ b/bgpd/bgp_attr.c
@@ -3400,7 +3400,8 @@ bgp_attr_unknown(struct bgp_attr_parser_args *args)
}
/* Well-known attribute check. */
-static int bgp_attr_check(struct peer *peer, struct attr *attr)
+static int bgp_attr_check(struct peer *peer, struct attr *attr,
+ bgp_size_t length)
{
uint8_t type = 0;
@@ -3409,7 +3410,8 @@ static int bgp_attr_check(struct peer *peer, struct attr *attr)
* we will pass it to be processed as a normal UPDATE without mandatory
* attributes, that could lead to harmful behavior.
*/
- if (CHECK_FLAG(peer->cap, PEER_CAP_RESTART_RCV) && !attr->flag)
+ if (CHECK_FLAG(peer->cap, PEER_CAP_RESTART_RCV) && !attr->flag &&
+ !length)
return BGP_ATTR_PARSE_WITHDRAW;
if (!CHECK_FLAG(attr->flag, ATTR_FLAG_BIT(BGP_ATTR_ORIGIN)))
@@ -3462,7 +3464,7 @@ enum bgp_attr_parse_ret bgp_attr_parse(struct peer *peer, struct attr *attr,
enum bgp_attr_parse_ret ret;
uint8_t flag = 0;
uint8_t type = 0;
- bgp_size_t length;
+ bgp_size_t length = 0;
uint8_t *startp, *endp;
uint8_t *attr_endp;
uint8_t seen[BGP_ATTR_BITMAP_SIZE];
@@ -3785,7 +3787,7 @@ enum bgp_attr_parse_ret bgp_attr_parse(struct peer *peer, struct attr *attr,
}
/* Check all mandatory well-known attributes are present */
- ret = bgp_attr_check(peer, attr);
+ ret = bgp_attr_check(peer, attr, length);
if (ret < 0)
goto done;

View File

@ -7,7 +7,7 @@
Name: frr Name: frr
Version: 8.5.3 Version: 8.5.3
Release: 2%{?checkout}%{?dist} Release: 4%{?checkout}%{?dist}
Summary: Routing daemon Summary: Routing daemon
License: GPLv2+ License: GPLv2+
URL: http://www.frrouting.org URL: http://www.frrouting.org
@ -69,6 +69,8 @@ Patch0003: 0003-disable-eigrp-crypto.patch
Patch0004: 0004-fips-mode.patch Patch0004: 0004-fips-mode.patch
Patch0005: 0005-CVE-2023-47235.patch Patch0005: 0005-CVE-2023-47235.patch
Patch0006: 0006-CVE-2023-47234.patch Patch0006: 0006-CVE-2023-47234.patch
Patch0007: 0007-CVE-2023-46752.patch
Patch0008: 0008-CVE-2023-46753.patch
%description %description
FRRouting is free software that manages TCP/IP based routing protocols. It takes FRRouting is free software that manages TCP/IP based routing protocols. It takes
@ -274,6 +276,12 @@ make check PYTHON=%{__python3}
%endif %endif
%changelog %changelog
* Mon Feb 05 2024 Michal Ruprich <mruprich@redhat.com> - 8.5.3-4
- Resolves: RHEL-14825 - crafted BGP UPDATE message leading to a crash
* Mon Feb 05 2024 Michal Ruprich <mruprich@redhat.com> - 8.5.3-3
- Resolves: RHEL-14822 - mishandled malformed data leading to a crash
* Mon Dec 18 2023 Michal Ruprich <mruprich@redhat.com> - 8.5.3-2 * Mon Dec 18 2023 Michal Ruprich <mruprich@redhat.com> - 8.5.3-2
- Resolves: RHEL-15915 - crash from specially crafted MP_UNREACH_NLRI-containing BGP UPDATE message - Resolves: RHEL-15915 - crash from specially crafted MP_UNREACH_NLRI-containing BGP UPDATE message
- Resolves: RHEL-15918 - crash from malformed EOR-containing BGP UPDATE message - Resolves: RHEL-15918 - crash from malformed EOR-containing BGP UPDATE message