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author | Daniil Baturin <daniil@vyos.io> | 2023-09-10 15:15:08 +0100 |
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committer | GitHub <noreply@github.com> | 2023-09-10 15:15:08 +0100 |
commit | 46f5655f475fc1e220ede69e55c87eae66e24b41 (patch) | |
tree | 6798fcaca9b66dafd36bc02d97486c5e5cc4686d | |
parent | 6e463ebc5a760ce850942488156201345485352e (diff) | |
parent | 13a5fa10d8c8632d08cf48a445c7d5925d3d42c4 (diff) | |
download | vyos-build-46f5655f475fc1e220ede69e55c87eae66e24b41.tar.gz vyos-build-46f5655f475fc1e220ede69e55c87eae66e24b41.zip |
Merge pull request #398 from c-po/equuleus
frr: T5557: use treat-as-withdraw for tunnel encapsulation attribute CVE-2023-38802
-rw-r--r-- | packages/frr/patches/0004-bgpd-Use-treat-as-withdraw-for-tunnel-encapsulation-.patch | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/packages/frr/patches/0004-bgpd-Use-treat-as-withdraw-for-tunnel-encapsulation-.patch b/packages/frr/patches/0004-bgpd-Use-treat-as-withdraw-for-tunnel-encapsulation-.patch new file mode 100644 index 00000000..a6d824c4 --- /dev/null +++ b/packages/frr/patches/0004-bgpd-Use-treat-as-withdraw-for-tunnel-encapsulation-.patch @@ -0,0 +1,134 @@ +From a3337f1bd534d1d2b47b149a14418c5d93d341e3 Mon Sep 17 00:00:00 2001 +From: Donatas Abraitis <donatas@opensourcerouting.org> +Date: Thu, 13 Jul 2023 22:32:03 +0300 +Subject: [PATCH] bgpd: Use treat-as-withdraw for tunnel encapsulation + attribute + +Before this path we used session reset method, which is discouraged by rfc7606. + +Handle this as rfc requires. + +Signed-off-by: Donatas Abraitis <donatas@opensourcerouting.org> +Signed-off-by: Christian Breunig <christian@breunig.cc> + +(cherry picked from commit bcb6b58d9530173df41d3a3cbc4c600ee0b4b186) +--- + bgpd/bgp_attr.c | 61 ++++++++++++++++++++----------------------------- + 1 file changed, 25 insertions(+), 36 deletions(-) + +diff --git a/bgpd/bgp_attr.c b/bgpd/bgp_attr.c +index f5e54267d..4bc28fe23 100644 +--- a/bgpd/bgp_attr.c ++++ b/bgpd/bgp_attr.c +@@ -1225,6 +1225,7 @@ bgp_attr_malformed(struct bgp_attr_parser_args *args, uint8_t subcode, + case BGP_ATTR_LARGE_COMMUNITIES: + case BGP_ATTR_ORIGINATOR_ID: + case BGP_ATTR_CLUSTER_LIST: ++ case BGP_ATTR_ENCAP: + return BGP_ATTR_PARSE_WITHDRAW; + case BGP_ATTR_MP_REACH_NLRI: + case BGP_ATTR_MP_UNREACH_NLRI: +@@ -2320,26 +2321,21 @@ bgp_attr_ipv6_ext_communities(struct bgp_attr_parser_args *args) + } + + /* Parse Tunnel Encap attribute in an UPDATE */ +-static int bgp_attr_encap(uint8_t type, struct peer *peer, /* IN */ +- bgp_size_t length, /* IN: attr's length field */ +- struct attr *attr, /* IN: caller already allocated */ +- uint8_t flag, /* IN: attr's flags field */ +- uint8_t *startp) ++static int bgp_attr_encap(struct bgp_attr_parser_args *args) + { +- bgp_size_t total; + uint16_t tunneltype = 0; +- +- total = length + (CHECK_FLAG(flag, BGP_ATTR_FLAG_EXTLEN) ? 4 : 3); ++ struct peer *const peer = args->peer; ++ struct attr *const attr = args->attr; ++ bgp_size_t length = args->length; ++ uint8_t type = args->type; ++ uint8_t flag = args->flags; + + if (!CHECK_FLAG(flag, BGP_ATTR_FLAG_TRANS) + || !CHECK_FLAG(flag, BGP_ATTR_FLAG_OPTIONAL)) { +- zlog_info( +- "Tunnel Encap attribute flag isn't optional and transitive %d", +- flag); +- bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR, +- BGP_NOTIFY_UPDATE_ATTR_FLAG_ERR, +- startp, total); +- return -1; ++ zlog_err("Tunnel Encap attribute flag isn't optional and transitive %d", ++ flag); ++ return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, ++ args->total); + } + + if (BGP_ATTR_ENCAP == type) { +@@ -2347,12 +2343,11 @@ static int bgp_attr_encap(uint8_t type, struct peer *peer, /* IN */ + uint16_t tlv_length; + + if (length < 4) { +- zlog_info( ++ zlog_err( + "Tunnel Encap attribute not long enough to contain outer T,L"); +- bgp_notify_send_with_data( +- peer, BGP_NOTIFY_UPDATE_ERR, +- BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, startp, total); +- return -1; ++ return bgp_attr_malformed(args, ++ BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, ++ args->total); + } + tunneltype = stream_getw(BGP_INPUT(peer)); + tlv_length = stream_getw(BGP_INPUT(peer)); +@@ -2382,13 +2377,11 @@ static int bgp_attr_encap(uint8_t type, struct peer *peer, /* IN */ + } + + if (sublength > length) { +- zlog_info( +- "Tunnel Encap attribute sub-tlv length %d exceeds remaining length %d", +- sublength, length); +- bgp_notify_send_with_data( +- peer, BGP_NOTIFY_UPDATE_ERR, +- BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, startp, total); +- return -1; ++ zlog_err("Tunnel Encap attribute sub-tlv length %d exceeds remaining length %d", ++ sublength, length); ++ return bgp_attr_malformed(args, ++ BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, ++ args->total); + } + + /* alloc and copy sub-tlv */ +@@ -2434,13 +2427,10 @@ static int bgp_attr_encap(uint8_t type, struct peer *peer, /* IN */ + + if (length) { + /* spurious leftover data */ +- zlog_info( +- "Tunnel Encap attribute length is bad: %d leftover octets", +- length); +- bgp_notify_send_with_data(peer, BGP_NOTIFY_UPDATE_ERR, +- BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, +- startp, total); +- return -1; ++ zlog_err("Tunnel Encap attribute length is bad: %d leftover octets", ++ length); ++ return bgp_attr_malformed(args, BGP_NOTIFY_UPDATE_OPT_ATTR_ERR, ++ args->total); + } + + return 0; +@@ -3128,8 +3118,7 @@ bgp_attr_parse_ret_t bgp_attr_parse(struct peer *peer, struct attr *attr, + case BGP_ATTR_VNC: + #endif + case BGP_ATTR_ENCAP: +- ret = bgp_attr_encap(type, peer, length, attr, flag, +- startp); ++ ret = bgp_attr_encap(&attr_args); + break; + case BGP_ATTR_PREFIX_SID: + ret = bgp_attr_prefix_sid(&attr_args); +-- +2.39.2 + |