From: Narpat Mali <narpat.m...@windriver.com> CVE-2023-38802: FRRouting FRR 7.5.1 through 9.0 and Pica8 PICOS 4.3.3.2 allow a remote attacker to cause a denial of service via a crafted BGP update with a corrupted attribute 23 (Tunnel Encapsulation).
CVE-2023-41358: An issue was discovered in FRRouting FRR through 9.0. bgpd/bgp_packet.c processes NLRIs if the attribute length is zero. References: https://nvd.nist.gov/vuln/detail/CVE-2023-38802 https://nvd.nist.gov/vuln/detail/CVE-2023-41358 Signed-off-by: Narpat Mali <narpat.m...@windriver.com> --- .../frr/frr/CVE-2023-38802.patch | 136 ++++++++++++++++++ .../frr/frr/CVE-2023-41358.patch | 105 ++++++++++++++ .../recipes-protocols/frr/frr_8.2.2.bb | 2 + 3 files changed, 243 insertions(+) create mode 100644 meta-networking/recipes-protocols/frr/frr/CVE-2023-38802.patch create mode 100644 meta-networking/recipes-protocols/frr/frr/CVE-2023-41358.patch diff --git a/meta-networking/recipes-protocols/frr/frr/CVE-2023-38802.patch b/meta-networking/recipes-protocols/frr/frr/CVE-2023-38802.patch new file mode 100644 index 0000000000..60801bf06e --- /dev/null +++ b/meta-networking/recipes-protocols/frr/frr/CVE-2023-38802.patch @@ -0,0 +1,136 @@ +From ad32e04f3db364694edc678327326ae6b771db9e Mon Sep 17 00:00:00 2001 +From: Donatas Abraitis <dona...@opensourcerouting.org> +Date: Tue, 5 Sep 2023 11:30:53 +0000 +Subject: [PATCH 1/2] 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 <dona...@opensourcerouting.org> + +CVE: CVE-2023-38802 + +Upstream-Status: Backport [https://github.com/FRRouting/frr/commit/bcb6b58d9530173df41d3a3cbc4c600ee0b4b186] + +Signed-off-by: Narpat Mali <narpat.m...@windriver.com> +--- + 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 5d06991e2..b10a60351 100644 +--- a/bgpd/bgp_attr.c ++++ b/bgpd/bgp_attr.c +@@ -1310,6 +1310,7 @@ 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: +@@ -2411,26 +2412,21 @@ 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) { +@@ -2438,12 +2434,11 @@ 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)); +@@ -2473,13 +2468,11 @@ 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 */ +@@ -2527,13 +2520,10 @@ 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; +@@ -3332,8 +3322,7 @@ 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); +-- +2.40.0 diff --git a/meta-networking/recipes-protocols/frr/frr/CVE-2023-41358.patch b/meta-networking/recipes-protocols/frr/frr/CVE-2023-41358.patch new file mode 100644 index 0000000000..e10d3e5267 --- /dev/null +++ b/meta-networking/recipes-protocols/frr/frr/CVE-2023-41358.patch @@ -0,0 +1,105 @@ +From ef9b66e742f9016b3bf283920b528cf20d2c969f Mon Sep 17 00:00:00 2001 +From: Donatas Abraitis <dona...@opensourcerouting.org> +Date: Tue, 5 Sep 2023 11:36:13 +0000 +Subject: [PATCH 2/2] bgpd: Do not process NLRIs if the attribute length is + zero + +``` +3 0x00007f423aa42476 in __GI_raise (sig=sig@entry=11) at ../sysdeps/posix/raise.c:26 +4 0x00007f423aef9740 in core_handler (signo=11, siginfo=0x7fffc414deb0, context=<optimized out>) at lib/sigevent.c:246 +5 <signal handler called> +6 0x0000564dea2fc71e in route_set_aspath_prepend (rule=0x564debd66d50, prefix=0x7fffc414ea30, object=0x7fffc414e400) + at bgpd/bgp_routemap.c:2258 +7 0x00007f423aeec7e0 in route_map_apply_ext (map=<optimized out>, prefix=prefix@entry=0x7fffc414ea30, + match_object=match_object@entry=0x7fffc414e400, set_object=set_object@entry=0x7fffc414e400, pref=pref@entry=0x0) at lib/routemap.c:2690 +8 0x0000564dea2d277e in bgp_input_modifier (peer=peer@entry=0x7f4238f59010, p=p@entry=0x7fffc414ea30, attr=attr@entry=0x7fffc414e770, + afi=afi@entry=AFI_IP, safi=safi@entry=SAFI_UNICAST, rmap_name=rmap_name@entry=0x0, label=0x0, num_labels=0, dest=0x564debdd5130) + at bgpd/bgp_route.c:1772 +9 0x0000564dea2df762 in bgp_update (peer=peer@entry=0x7f4238f59010, p=p@entry=0x7fffc414ea30, addpath_id=addpath_id@entry=0, + attr=0x7fffc414eb50, afi=afi@entry=AFI_IP, safi=<optimized out>, safi@entry=SAFI_UNICAST, type=9, sub_type=0, prd=0x0, label=0x0, + num_labels=0, soft_reconfig=0, evpn=0x0) at bgpd/bgp_route.c:4374 +10 0x0000564dea2e2047 in bgp_nlri_parse_ip (peer=0x7f4238f59010, attr=attr@entry=0x7fffc414eb50, packet=0x7fffc414eaf0) + at bgpd/bgp_route.c:6249 +11 0x0000564dea2c5a58 in bgp_nlri_parse (peer=peer@entry=0x7f4238f59010, attr=attr@entry=0x7fffc414eb50, + packet=packet@entry=0x7fffc414eaf0, mp_withdraw=mp_withdraw@entry=false) at bgpd/bgp_packet.c:339 +12 0x0000564dea2c5d66 in bgp_update_receive (peer=peer@entry=0x7f4238f59010, size=size@entry=109) at bgpd/bgp_packet.c:2024 +13 0x0000564dea2c901d in bgp_process_packet (thread=<optimized out>) at bgpd/bgp_packet.c:2933 +14 0x00007f423af0bf71 in event_call (thread=thread@entry=0x7fffc414ee40) at lib/event.c:1995 +15 0x00007f423aebb198 in frr_run (master=0x564deb73c670) at lib/libfrr.c:1213 +16 0x0000564dea261b83 in main (argc=<optimized out>, argv=<optimized out>) at bgpd/bgp_main.c:505 +``` + +With the configuration: + +``` +frr version 9.1-dev-MyOwnFRRVersion +frr defaults traditional +hostname ip-172-31-13-140 +log file /tmp/debug.log +log syslog +service integrated-vtysh-config +! +debug bgp keepalives +debug bgp neighbor-events +debug bgp updates in +debug bgp updates out +! +router bgp 100 + bgp router-id 9.9.9.9 + no bgp ebgp-requires-policy + bgp bestpath aigp + neighbor 172.31.2.47 remote-as 200 + ! + address-family ipv4 unicast + neighbor 172.31.2.47 default-originate + neighbor 172.31.2.47 route-map RM_IN in + exit-address-family +exit +! +route-map RM_IN permit 10 + set as-path prepend 200 +exit +! +``` + +The issue is that we try to process NLRIs even if the attribute length is 0. + +Later bgp_update() will handle route-maps and a crash occurs because all the +attributes are NULL, including aspath, where we dereference. + +According to the RFC 4271: + +A value of 0 indicates that neither the Network Layer + Reachability Information field nor the Path Attribute field is + present in this UPDATE message. + +But with a fuzzed UPDATE message this can be faked. I think it's reasonable +to skip processing NLRIs if both update_len and attribute_len are 0. + +Reported-by: Iggy Frankovic <iggyf...@amazon.com> +Signed-off-by: Donatas Abraitis <dona...@opensourcerouting.org> + +CVE: CVE-2023-41358 + +Upstream-Status: Backport [https://github.com/FRRouting/frr/pull/14260/commits/28ccc24d38df1d51ed8a563507e5d6f6171fdd38] + +Signed-off-by: Narpat Mali <narpat.m...@windriver.com> +--- + bgpd/bgp_packet.c | 2 +- + 1 file changed, 1 insertion(+), 1 deletion(-) + +diff --git a/bgpd/bgp_packet.c b/bgpd/bgp_packet.c +index 0166dc6a2..2fd28aae3 100644 +--- a/bgpd/bgp_packet.c ++++ b/bgpd/bgp_packet.c +@@ -1767,7 +1767,7 @@ static int bgp_update_receive(struct peer *peer, bgp_size_t size) + /* Network Layer Reachability Information. */ + update_len = end - stream_pnt(s); + +- if (update_len) { ++ if (update_len && attribute_len) { + /* Set NLRI portion to structure. */ + nlris[NLRI_UPDATE].afi = AFI_IP; + nlris[NLRI_UPDATE].safi = SAFI_UNICAST; +-- +2.40.0 diff --git a/meta-networking/recipes-protocols/frr/frr_8.2.2.bb b/meta-networking/recipes-protocols/frr/frr_8.2.2.bb index 1897eb2abd..7af584835f 100644 --- a/meta-networking/recipes-protocols/frr/frr_8.2.2.bb +++ b/meta-networking/recipes-protocols/frr/frr_8.2.2.bb @@ -18,6 +18,8 @@ SRC_URI = "git://github.com/FRRouting/frr.git;protocol=https;branch=stable/8.2 \ file://CVE-2022-43681.patch \ file://CVE-2023-31489.patch \ file://CVE-2023-31490.patch \ + file://CVE-2023-38802.patch \ + file://CVE-2023-41358.patch \ file://frr.pam \ " -- 2.40.0
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