a775fc8d7f
and other issues, see https://frrouting.org/release/10.0.2/ - Removed patch included in the sources: [- 0002-bgpd-Check-the-actual-remaining-stream-length-before.patch] OBS-URL: https://build.opensuse.org/package/show/network/frr?expand=0&rev=79
110 lines
4.1 KiB
Diff
110 lines
4.1 KiB
Diff
From 4e70b09f24b72fbb27ff5eda63393bfd2a72ef37 Mon Sep 17 00:00:00 2001
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From: Olivier Dugeon <olivier.dugeon@orange.com>
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Date: Fri, 5 Apr 2024 12:57:11 +0200
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Upstream: yes
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References: CVE-2024-31951,bsc#1222528,gh#FRRouting/frr#16088
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Subject: [PATCH 2/3] ospfd: Correct Opaque LSA Extended parser
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Iggy Frankovic discovered another ospfd crash when performing fuzzing of OSPF
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LSA packets. The crash occurs in ospf_te_parse_ext_link() function when
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attemping to read Segment Routing Adjacency SID subTLVs. The original code
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doesn't check if the size of the Extended Link TLVs and subTLVs have the correct
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length. In presence of erronous LSA, this will cause a buffer overflow and ospfd
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crashes.
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This patch introduces new verification of the subTLVs size for Extended Link
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TLVs and subTLVs. Similar check has been also introduced for the Extended
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Prefix TLV.
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Co-authored-by: Iggy Frankovic <iggyfran@amazon.com>
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Signed-off-by: Olivier Dugeon <olivier.dugeon@orange.com>
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(cherry picked from commit 5557a289acdaeec8cc63ffc97b5c2abf6dee7b3a)
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---
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ospfd/ospf_te.c | 35 +++++++++++++++++++++++++++++++++--
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1 file changed, 33 insertions(+), 2 deletions(-)
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diff --git a/ospfd/ospf_te.c b/ospfd/ospf_te.c
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index 885b915585..23a1b181ec 100644
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--- a/ospfd/ospf_te.c
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+++ b/ospfd/ospf_te.c
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@@ -2647,6 +2647,7 @@ static int ospf_te_parse_ext_pref(struct ls_ted *ted, struct ospf_lsa *lsa)
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struct ext_tlv_prefix *ext;
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struct ext_subtlv_prefix_sid *pref_sid;
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uint32_t label;
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+ uint16_t len, size;
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/* Get corresponding Subnet from Link State Data Base */
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ext = (struct ext_tlv_prefix *)TLV_HDR_TOP(lsa->data);
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@@ -2668,6 +2669,18 @@ static int ospf_te_parse_ext_pref(struct ls_ted *ted, struct ospf_lsa *lsa)
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ote_debug(" |- Process Extended Prefix LSA %pI4 for subnet %pFX",
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&lsa->data->id, &pref);
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+ /*
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+ * Check Extended Prefix TLV size against LSA size
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+ * as only one TLV is allowed per LSA
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+ */
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+ len = TLV_BODY_SIZE(&ext->header);
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+ size = lsa->size - (OSPF_LSA_HEADER_SIZE + TLV_HDR_SIZE);
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+ if (len != size || len <= 0) {
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+ ote_debug(" |- Wrong TLV size: %u instead of %u",
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+ (uint32_t)len, (uint32_t)size);
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+ return -1;
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+ }
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+
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/* Initialize TLV browsing */
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ls_pref = subnet->ls_pref;
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pref_sid = (struct ext_subtlv_prefix_sid *)((char *)(ext) + TLV_HDR_SIZE
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@@ -2778,8 +2791,20 @@ static int ospf_te_parse_ext_link(struct ls_ted *ted, struct ospf_lsa *lsa)
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ote_debug(" |- Process Extended Link LSA %pI4 for edge %pI4",
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&lsa->data->id, &edge->attributes->standard.local);
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- /* Initialize TLV browsing */
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- len = TLV_BODY_SIZE(&ext->header) - EXT_TLV_LINK_SIZE;
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+ /*
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+ * Check Extended Link TLV size against LSA size
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+ * as only one TLV is allowed per LSA
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+ */
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+ len = TLV_BODY_SIZE(&ext->header);
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+ i = lsa->size - (OSPF_LSA_HEADER_SIZE + TLV_HDR_SIZE);
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+ if (len != i || len <= 0) {
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+ ote_debug(" |- Wrong TLV size: %u instead of %u",
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+ (uint32_t)len, (uint32_t)i);
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+ return -1;
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+ }
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+
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+ /* Initialize subTLVs browsing */
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+ len -= EXT_TLV_LINK_SIZE;
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tlvh = (struct tlv_header *)((char *)(ext) + TLV_HDR_SIZE
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+ EXT_TLV_LINK_SIZE);
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for (; sum < len; tlvh = TLV_HDR_NEXT(tlvh)) {
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@@ -2789,6 +2814,8 @@ static int ospf_te_parse_ext_link(struct ls_ted *ted, struct ospf_lsa *lsa)
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switch (ntohs(tlvh->type)) {
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case EXT_SUBTLV_ADJ_SID:
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+ if (TLV_BODY_SIZE(tlvh) != EXT_SUBTLV_ADJ_SID_SIZE)
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+ break;
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adj = (struct ext_subtlv_adj_sid *)tlvh;
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label = CHECK_FLAG(adj->flags,
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EXT_SUBTLV_LINK_ADJ_SID_VFLG)
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@@ -2815,6 +2842,8 @@ static int ospf_te_parse_ext_link(struct ls_ted *ted, struct ospf_lsa *lsa)
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break;
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case EXT_SUBTLV_LAN_ADJ_SID:
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+ if (TLV_BODY_SIZE(tlvh) != EXT_SUBTLV_LAN_ADJ_SID_SIZE)
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+ break;
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ladj = (struct ext_subtlv_lan_adj_sid *)tlvh;
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label = CHECK_FLAG(ladj->flags,
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EXT_SUBTLV_LINK_ADJ_SID_VFLG)
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@@ -2844,6 +2873,8 @@ static int ospf_te_parse_ext_link(struct ls_ted *ted, struct ospf_lsa *lsa)
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break;
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case EXT_SUBTLV_RMT_ITF_ADDR:
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+ if (TLV_BODY_SIZE(tlvh) != EXT_SUBTLV_RMT_ITF_ADDR_SIZE)
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+ break;
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rmt = (struct ext_subtlv_rmt_itf_addr *)tlvh;
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if (CHECK_FLAG(atr->flags, LS_ATTR_NEIGH_ADDR)
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&& IPV4_ADDR_SAME(&atr->standard.remote,
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--
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2.35.3
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