From 9ba865f54d331c550629304cb25e77ac81455803 Mon Sep 17 00:00:00 2001 From: Juraj Vijtiuk Date: Wed, 13 Oct 2021 18:32:53 +0200 Upstream: yes References: bsc#1196505, CVE-2022-26125 Subject: [PATCH] isisd: fix router capability TLV parsing issues Backport of the patch to frr-7.4 by Marius Tomaschewski isis_tlvs.c would fail at multiple places if incorrect TLVs were received causing stream assertion violations. This patch fixes the issues by adding missing length checks, missing consumed length updates and handling malformed Segment Routing subTLVs. Signed-off-by: Juraj Vijtiuk Small adjustments by Igor Ryzhov: - fix incorrect replacement of srgb by srlb on lines 3052 and 3054 - add length check for ISIS_SUBTLV_ALGORITHM - fix conflict in fuzzing data during rebase Signed-off-by: Igor Ryzhov diff --git a/isisd/isis_tlvs.c b/isisd/isis_tlvs.c index 923956fa6..e9f615c47 100644 --- a/isisd/isis_tlvs.c +++ b/isisd/isis_tlvs.c @@ -2721,10 +2721,11 @@ static int unpack_tlv_router_cap(enum isis_tlv_context context, void *dest, int indent) { struct isis_tlvs *tlvs = dest; + struct isis_router_cap *rcap; uint8_t type; uint8_t length; uint8_t subtlv_len; - uint8_t sid_len; + uint8_t size; sbuf_push(log, indent, "Unpacking Router Capability TLV...\n"); if (tlv_len < ISIS_ROUTER_CAP_SIZE) { @@ -2741,47 +2742,89 @@ static int unpack_tlv_router_cap(enum isis_tlv_context context, } /* Allocate router cap structure and initialize SR Algorithms */ - tlvs->router_cap = XCALLOC(MTYPE_ISIS_TLV, sizeof(*tlvs->router_cap)); + rcap = XCALLOC(MTYPE_ISIS_TLV, sizeof(struct isis_router_cap)); for (int i = 0; i < SR_ALGORITHM_COUNT; i++) - tlvs->router_cap->algo[i] = SR_ALGORITHM_UNSET; + rcap->algo[i] = SR_ALGORITHM_UNSET; /* Get Router ID and Flags */ - tlvs->router_cap->router_id.s_addr = stream_get_ipv4(s); - tlvs->router_cap->flags = stream_getc(s); + rcap->router_id.s_addr = stream_get_ipv4(s); + rcap->flags = stream_getc(s); /* Parse remaining part of the TLV if present */ subtlv_len = tlv_len - ISIS_ROUTER_CAP_SIZE; while (subtlv_len > 2) { - struct isis_router_cap *rc = tlvs->router_cap; uint8_t msd_type; type = stream_getc(s); length = stream_getc(s); + + if (length > STREAM_READABLE(s) || length > subtlv_len - 2) { + sbuf_push( + log, indent, + "WARNING: Router Capability subTLV length too large compared to expected size\n"); + stream_forward_getp(s, STREAM_READABLE(s)); + return 0; + } + switch (type) { case ISIS_SUBTLV_SID_LABEL_RANGE: - rc->srgb.flags = stream_getc(s); - rc->srgb.range_size = stream_get3(s); + /* Check that SRGB is correctly formated */ + if (length < SUBTLV_RANGE_LABEL_SIZE + || length > SUBTLV_RANGE_INDEX_SIZE) { + stream_forward_getp(s, length); + break; + } + /* Only one SRGB is supported. Skip subsequent one */ + if (rcap->srgb.range_size != 0) { + stream_forward_getp(s, length); + break; + } + rcap->srgb.flags = stream_getc(s); + rcap->srgb.range_size = stream_get3(s); /* Skip Type and get Length of SID Label */ stream_getc(s); - sid_len = stream_getc(s); - if (sid_len == ISIS_SUBTLV_SID_LABEL_SIZE) - rc->srgb.lower_bound = stream_get3(s); - else - rc->srgb.lower_bound = stream_getl(s); + size = stream_getc(s); + + if (size == ISIS_SUBTLV_SID_LABEL_SIZE + && length != SUBTLV_RANGE_LABEL_SIZE) { + stream_forward_getp(s, length - 6); + break; + } + if (size == ISIS_SUBTLV_SID_INDEX_SIZE + && length != SUBTLV_RANGE_INDEX_SIZE) { + stream_forward_getp(s, length - 6); + break; + } + + if (size == ISIS_SUBTLV_SID_LABEL_SIZE) { + rcap->srgb.lower_bound = stream_get3(s); + } else if (size == ISIS_SUBTLV_SID_INDEX_SIZE) { + rcap->srgb.lower_bound = stream_getl(s); + } else { + stream_forward_getp(s, length - 6); + break; + } /* SRGB sanity checks. */ - if (rc->srgb.range_size == 0 - || (rc->srgb.lower_bound <= MPLS_LABEL_RESERVED_MAX) - || ((rc->srgb.lower_bound + rc->srgb.range_size - 1) + if (rcap->srgb.range_size == 0 + || (rcap->srgb.lower_bound <= MPLS_LABEL_RESERVED_MAX) + || ((rcap->srgb.lower_bound + rcap->srgb.range_size - 1) > MPLS_LABEL_UNRESERVED_MAX)) { sbuf_push(log, indent, "Invalid label range. Reset SRGB\n"); - rc->srgb.lower_bound = 0; - rc->srgb.range_size = 0; + rcap->srgb.lower_bound = 0; + rcap->srgb.range_size = 0; } + /* Only one range is supported. Skip subsequent one */ + size = length - (size + SUBTLV_SR_BLOCK_SIZE); + if (size > 0) + stream_forward_getp(s, size); + break; case ISIS_SUBTLV_ALGORITHM: + if (length == 0) + break; /* Only 2 algorithms are supported: SPF & Strict SPF */ - stream_get(&rc->algo, s, + stream_get(&rcap->algo, s, length > SR_ALGORITHM_COUNT ? SR_ALGORITHM_COUNT : length); @@ -2790,11 +2833,19 @@ static int unpack_tlv_router_cap(enum isis_tlv_context context, s, length - SR_ALGORITHM_COUNT); break; case ISIS_SUBTLV_NODE_MSD: + /* Check that MSD is correctly formated */ + if (length < MSD_TLV_SIZE) { + stream_forward_getp(s, length); + break; + } msd_type = stream_getc(s); - rc->msd = stream_getc(s); + rcap->msd = stream_getc(s); /* Only BMI-MSD type has been defined in RFC 8491 */ if (msd_type != MSD_TYPE_BASE_MPLS_IMPOSITION) - rc->msd = 0; + rcap->msd = 0; + /* Only one MSD is standardized. Skip others */ + if (length > MSD_TLV_SIZE) + stream_forward_getp(s, length - MSD_TLV_SIZE); break; default: stream_forward_getp(s, length); @@ -2802,6 +2853,7 @@ static int unpack_tlv_router_cap(enum isis_tlv_context context, } subtlv_len = subtlv_len - length - 2; } + tlvs->router_cap = rcap; return 0; } diff --git a/isisd/isis_tlvs.h b/isisd/isis_tlvs.h index f468d85bb..0278d18de 100644 --- a/isisd/isis_tlvs.h +++ b/isisd/isis_tlvs.h @@ -140,6 +140,9 @@ struct isis_threeway_adj { #define ISIS_SUBTLV_SRGB_FLAG_V 0x40 #define IS_SR_IPV4(srgb) (srgb.flags & ISIS_SUBTLV_SRGB_FLAG_I) #define IS_SR_IPV6(srgb) (srgb.flags & ISIS_SUBTLV_SRGB_FLAG_V) +#define SUBTLV_SR_BLOCK_SIZE 6 +#define SUBTLV_RANGE_INDEX_SIZE 10 +#define SUBTLV_RANGE_LABEL_SIZE 9 /* Structure aggregating SRGB info */ struct isis_srgb { @@ -209,6 +212,9 @@ struct isis_lan_adj_sid { #define SR_ALGORITHM_STRICT_SPF 1 #define SR_ALGORITHM_UNSET 255 +#define MSD_TYPE_BASE_MPLS_IMPOSITION 0x01 +#define MSD_TLV_SIZE 2 + struct isis_router_cap { struct in_addr router_id; uint8_t flags; @@ -217,7 +223,6 @@ struct isis_router_cap { struct isis_srgb srgb; uint8_t algo[SR_ALGORITHM_COUNT]; /* RFC 8491 */ -#define MSD_TYPE_BASE_MPLS_IMPOSITION 0x01 uint8_t msd; }; @@ -433,6 +438,7 @@ enum ext_subtlv_size { /* RFC 8667 section #2 */ ISIS_SUBTLV_SID_LABEL_SIZE = 3, + ISIS_SUBTLV_SID_INDEX_SIZE = 4, ISIS_SUBTLV_SID_LABEL_RANGE_SIZE = 9, ISIS_SUBTLV_ALGORITHM_SIZE = 4, ISIS_SUBTLV_ADJ_SID_SIZE = 5, # # Extracted: # diff --git a/tests/isisd/test_fuzz_isis_tlv_tests.h.gz b/tests/isisd/test_fuzz_isis_tlv_tests.h.gz # index 4f59d1d7c044b4c3754c0cb077019659a045f51c..b3ed311b4178d72b719dc7ae9cca2ea451404f47 100644 # GIT binary patch # delta 18831 --- a/tests/isisd/test_fuzz_isis_tlv_tests.h +++ b/tests/isisd/test_fuzz_isis_tlv_tests.h @@ -2731,9 +2731,9 @@ { .input = 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- .output_len = 1415, - .ret = 2 + .output = 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+ .output_len = 514, + .ret = 0 }, { @@ -3003,9 +3003,9 @@ { .input = 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- .output_len = 1176, - .ret = 2 + .output = 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+ .output_len = 586, + .ret = 0 }, {