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frr/0007-CVE-2024-31949.patch

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Resolves: RHEL-32128 - infinite loop
2024-04-18 10:43:05 +00:00
From 2a5ea423efe179c018b836a1c5a256c93ae429ef Mon Sep 17 00:00:00 2001
From: Donatas Abraitis <donatas@opensourcerouting.org>
Date: Sat, 30 Mar 2024 15:35:18 +0200
Subject: [PATCH] bgpd: Fix errors handling for MP/GR capabilities as dynamic
capability
When receiving a MP/GR capability as dynamic capability, but malformed, do not
forget to advance the pointer to avoid hitting infinity loop.
After:
```
Mar 29 11:15:28 donatas-laptop bgpd[353550]: [GS0AQ-HKY0X] 127.0.0.1 rcv CAPABILITY
Mar 29 11:15:28 donatas-laptop bgpd[353550]: [JTVED-VGTQQ] 127.0.0.1(donatas-pc): CAPABILITY has action: 1, code: 5, length 0
Mar 29 11:15:28 donatas-laptop bgpd[353550]: [JTVED-VGTQQ] 127.0.0.1(donatas-pc): CAPABILITY has action: 1, code: 0, length 0
Mar 29 11:15:28 donatas-laptop bgpd[353550]: [HFHDS-QT71N][EC 33554494] 127.0.0.1(donatas-pc): unrecognized capability code: 0 - ignored
Mar 29 11:15:28 donatas-laptop bgpd[353550]: [JTVED-VGTQQ] 127.0.0.1(donatas-pc): CAPABILITY has action: 0, code: 0, length 0
Mar 29 11:15:28 donatas-laptop bgpd[353550]: [HFHDS-QT71N][EC 33554494] 127.0.0.1(donatas-pc): unrecognized capability code: 0 - ignored
Mar 29 11:15:28 donatas-laptop bgpd[353550]: [JTVED-VGTQQ] 127.0.0.1(donatas-pc): CAPABILITY has action: 0, code: 0, length 0
Mar 29 11:15:28 donatas-laptop bgpd[353550]: [HFHDS-QT71N][EC 33554494] 127.0.0.1(donatas-pc): unrecognized capability code: 0 - ignored
Mar 29 11:15:28 donatas-laptop bgpd[353550]: [JTVED-VGTQQ] 127.0.0.1(donatas-pc): CAPABILITY has action: 0, code: 0, length 1
Mar 29 11:15:28 donatas-laptop bgpd[353550]: [HFHDS-QT71N][EC 33554494] 127.0.0.1(donatas-pc): unrecognized capability code: 0 - ignored
Mar 29 11:15:28 donatas-laptop bgpd[353550]: [JTVED-VGTQQ] 127.0.0.1(donatas-pc): CAPABILITY has action: 1, code: 1, length 10
Mar 29 11:15:28 donatas-laptop bgpd[353550]: [Z1DRQ-N6Z5F] 127.0.0.1(donatas-pc): Dynamic Capability MultiProtocol Extensions afi/safi invalid (bad-value/unicast)
```
Before:
```
Mar 29 11:14:54 donatas-laptop bgpd[347675]: [JTVED-VGTQQ] 127.0.0.1(donatas-pc): CAPABILITY has action: 1, code: 1, length 10
Mar 29 11:14:54 donatas-laptop bgpd[347675]: [Z1DRQ-N6Z5F] 127.0.0.1(donatas-pc): Dynamic Capability MultiProtocol Extensions afi/safi invalid (bad-value/unicast)
Mar 29 11:14:54 donatas-laptop bgpd[347675]: [JTVED-VGTQQ] 127.0.0.1(donatas-pc): CAPABILITY has action: 1, code: 1, length 10
Mar 29 11:14:54 donatas-laptop bgpd[347675]: [Z1DRQ-N6Z5F] 127.0.0.1(donatas-pc): Dynamic Capability MultiProtocol Extensions afi/safi invalid (bad-value/unicast)
Mar 29 11:14:54 donatas-laptop bgpd[347675]: [JTVED-VGTQQ] 127.0.0.1(donatas-pc): CAPABILITY has action: 1, code: 1, length 10
Mar 29 11:14:54 donatas-laptop bgpd[347675]: [Z1DRQ-N6Z5F] 127.0.0.1(donatas-pc): Dynamic Capability MultiProtocol Extensions afi/safi invalid (bad-value/unicast)
Mar 29 11:14:54 donatas-laptop bgpd[347675]: [JTVED-VGTQQ] 127.0.0.1(donatas-pc): CAPABILITY has action: 1, code: 1, length 10
Mar 29 11:14:54 donatas-laptop bgpd[347675]: [Z1DRQ-N6Z5F] 127.0.0.1(donatas-pc): Dynamic Capability MultiProtocol Extensions afi/safi invalid (bad-value/unicast)
Mar 29 11:14:54 donatas-laptop bgpd[347675]: [JTVED-VGTQQ] 127.0.0.1(donatas-pc): CAPABILITY has action: 1, code: 1, length 10
Mar 29 11:14:54 donatas-laptop bgpd[347675]: [Z1DRQ-N6Z5F] 127.0.0.1(donatas-pc): Dynamic Capability MultiProtocol Extensions afi/safi invalid (bad-value/unicast)
Mar 29 11:14:54 donatas-laptop bgpd[347675]: [JTVED-VGTQQ] 127.0.0.1(donatas-pc): CAPABILITY has action: 1, code: 1, length 10
Mar 29 11:14:54 donatas-laptop bgpd[347675]: [Z1DRQ-N6Z5F] 127.0.0.1(donatas-pc): Dynamic Capability MultiProtocol Extensions afi/safi invalid (bad-value/unicast)
Mar 29 11:14:54 donatas-laptop bgpd[347675]: [JTVED-VGTQQ] 127.0.0.1(donatas-pc): CAPABILITY has action: 1, code: 1, length 10
Mar 29 11:14:54 donatas-laptop bgpd[347675]: [Z1DRQ-N6Z5F] 127.0.0.1(donatas-pc): Dynamic Capability MultiProtocol Extensions afi/safi invalid (bad-value/unicast)
Mar 29 11:14:54 donatas-laptop bgpd[347675]: [JTVED-VGTQQ] 127.0.0.1(donatas-pc): CAPABILITY has action: 1, code: 1, length 10
Mar 29 11:14:54 donatas-laptop bgpd[347675]: [Z1DRQ-N6Z5F] 127.0.0.1(donatas-pc): Dynamic Capability MultiProtocol Extensions afi/safi invalid (bad-value/unicast)
Mar 29 11:14:54 donatas-laptop bgpd[347675]: [JTVED-VGTQQ] 127.0.0.1(donatas-pc): CAPABILITY has action: 1, code: 1, length 10
Mar 29 11:14:54 donatas-laptop bgpd[347675]: [Z1DRQ-N6Z5F] 127.0.0.1(donatas-pc): Dynamic Capability MultiProtocol Extensions afi/safi invalid (bad-value/unicast)
Mar 29 11:14:54 donatas-laptop bgpd[347675]: [JTVED-VGTQQ] 127.0.0.1(donatas-pc): CAPABILITY has action: 1, code: 1, length 10
Mar 29 11:14:54 donatas-laptop bgpd[347675]: [Z1DRQ-N6Z5F] 127.0.0.1(donatas-pc): Dynamic Capability MultiProtocol Extensions afi/safi invalid (bad-value/unicast)
Mar 29 11:14:54 donatas-laptop bgpd[347675]: [JTVED-VGTQQ] 127.0.0.1(donatas-pc): CAPABILITY has action: 1, code: 1, length 10
Mar 29 11:14:54 donatas-laptop bgpd[347675]: [Z1DRQ-N6Z5F] 127.0.0.1(donatas-pc): Dynamic Capability MultiProtocol Extensions afi/safi invalid (bad-value/unicast)
Mar 29 11:14:54 donatas-laptop bgpd[347675]: [JTVED-VGTQQ] 127.0.0.1(donatas-pc): CAPABILITY has action: 1, code: 1, length 10
Mar 29 11:14:54 donatas-laptop bgpd[347675]: [Z1DRQ-N6Z5F] 127.0.0.1(donatas-pc): Dynamic Capability MultiProtocol Extensions afi/safi invalid (bad-value/unicast)
Mar 29 11:14:54 donatas-laptop bgpd[347675]: [JTVED-VGTQQ] 127.0.0.1(donatas-pc): CAPABILITY has action: 1, code: 1, length 10
Mar 29 11:14:54 donatas-laptop bgpd[347675]: [Z1DRQ-N6Z5F] 127.0.0.1(donatas-pc): Dynamic Capability MultiProtocol Extensions afi/safi invalid (bad-value/unicast)
Mar 29 11:14:54 donatas-laptop bgpd[347675]: [JTVED-VGTQQ] 127.0.0.1(donatas-pc): CAPABILITY has action: 1, code: 1, length 10
Mar 29 11:14:54 donatas-laptop bgpd[347675]: [Z1DRQ-N6Z5F] 127.0.0.1(donatas-pc): Dynamic Capability MultiProtocol Extensions afi/safi invalid (bad-value/unicast)
Mar 29 11:14:54 donatas-laptop bgpd[347675]: [JTVED-VGTQQ] 127.0.0.1(donatas-pc): CAPABILITY has action: 1, code: 1, length 10
Mar 29 11:14:54 donatas-laptop bgpd[347675]: [Z1DRQ-N6Z5F] 127.0.0.1(donatas-pc): Dynamic Capability MultiProtocol Extensions afi/safi invalid (bad-value/unicast)
Mar 29 11:14:54 donatas-laptop bgpd[347675]: [JTVED-VGTQQ] 127.0.0.1(donatas-pc): CAPABILITY has action: 1, code: 1, length 10
```
Reported-by: Iggy Frankovic <iggyfran@amazon.com>
Signed-off-by: Donatas Abraitis <donatas@opensourcerouting.org>
(cherry picked from commit 30a332dad86fafd2b0b6c61d23de59ed969a219b)
---
bgpd/bgp_packet.c | 17 ++++++++++-------
1 file changed, 10 insertions(+), 7 deletions(-)
diff --git a/bgpd/bgp_packet.c b/bgpd/bgp_packet.c
index 7d6a6b55e8d8..1f808eea725a 100644
--- a/bgpd/bgp_packet.c
+++ b/bgpd/bgp_packet.c
@@ -3610,6 +3610,7 @@ static int bgp_capability_msg_parse(struct peer *peer, uint8_t *pnt,
zlog_err("%pBP: Capability length error", peer);
bgp_notify_send(peer->connection, BGP_NOTIFY_CEASE,
BGP_NOTIFY_SUBCODE_UNSPECIFIC);
+ pnt += length;
return BGP_Stop;
}
action = *pnt;
@@ -3622,7 +3623,7 @@ static int bgp_capability_msg_parse(struct peer *peer, uint8_t *pnt,
action);
bgp_notify_send(peer->connection, BGP_NOTIFY_CEASE,
BGP_NOTIFY_SUBCODE_UNSPECIFIC);
- return BGP_Stop;
+ goto done;
}
if (bgp_debug_neighbor_events(peer))
@@ -3634,12 +3635,13 @@ static int bgp_capability_msg_parse(struct peer *peer, uint8_t *pnt,
zlog_err("%pBP: Capability length error", peer);
bgp_notify_send(peer->connection, BGP_NOTIFY_CEASE,
BGP_NOTIFY_SUBCODE_UNSPECIFIC);
+ pnt += length;
return BGP_Stop;
}
/* Ignore capability when override-capability is set. */
if (CHECK_FLAG(peer->flags, PEER_FLAG_OVERRIDE_CAPABILITY))
- continue;
+ goto done;
capability = lookup_msg(capcode_str, hdr->code, "Unknown");
@@ -3654,7 +3656,7 @@ static int bgp_capability_msg_parse(struct peer *peer, uint8_t *pnt,
peer, capability,
sizeof(struct capability_mp_data),
hdr->length);
- return BGP_Stop;
+ goto done;
}
memcpy(&mpc, pnt + 3, sizeof(struct capability_mp_data));
@@ -3669,7 +3671,7 @@ static int bgp_capability_msg_parse(struct peer *peer, uint8_t *pnt,
peer, capability,
iana_afi2str(pkt_afi),
iana_safi2str(pkt_safi));
- continue;
+ goto done;
}
/* Address family check. */
@@ -3696,7 +3698,7 @@ static int bgp_capability_msg_parse(struct peer *peer, uint8_t *pnt,
if (peer_active_nego(peer))
bgp_clear_route(peer, afi, safi);
else
- return BGP_Stop;
+ goto done;
}
break;
case CAPABILITY_CODE_RESTART:
@@ -3706,7 +3708,7 @@ static int bgp_capability_msg_parse(struct peer *peer, uint8_t *pnt,
bgp_notify_send(peer->connection,
BGP_NOTIFY_CEASE,
BGP_NOTIFY_SUBCODE_UNSPECIFIC);
- return BGP_Stop;
+ goto done;
}
bgp_dynamic_capability_graceful_restart(pnt, action,
@@ -3738,7 +3740,7 @@ static int bgp_capability_msg_parse(struct peer *peer, uint8_t *pnt,
bgp_notify_send(peer->connection,
BGP_NOTIFY_CEASE,
BGP_NOTIFY_SUBCODE_UNSPECIFIC);
- return BGP_Stop;
+ goto done;
}
uint8_t role;
@@ -3760,6 +3762,7 @@ static int bgp_capability_msg_parse(struct peer *peer, uint8_t *pnt,
break;
}
+done:
pnt += hdr->length + 3;
}
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