cve-2024-50038
Vulnerability from cvelistv5
Published
2024-10-21 19:39
Modified
2024-12-19 09:31
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: xtables: avoid NFPROTO_UNSPEC where needed syzbot managed to call xt_cluster match via ebtables: WARNING: CPU: 0 PID: 11 at net/netfilter/xt_cluster.c:72 xt_cluster_mt+0x196/0x780 [..] ebt_do_table+0x174b/0x2a40 Module registers to NFPROTO_UNSPEC, but it assumes ipv4/ipv6 packet processing. As this is only useful to restrict locally terminating TCP/UDP traffic, register this for ipv4 and ipv6 family only. Pablo points out that this is a general issue, direct users of the set/getsockopt interface can call into targets/matches that were only intended for use with ip(6)tables. Check all UNSPEC matches and targets for similar issues: - matches and targets are fine except if they assume skb_network_header() is valid -- this is only true when called from inet layer: ip(6) stack pulls the ip/ipv6 header into linear data area. - targets that return XT_CONTINUE or other xtables verdicts must be restricted too, they are incompatbile with the ebtables traverser, e.g. EBT_CONTINUE is a completely different value than XT_CONTINUE. Most matches/targets are changed to register for NFPROTO_IPV4/IPV6, as they are provided for use by ip(6)tables. The MARK target is also used by arptables, so register for NFPROTO_ARP too. While at it, bail out if connbytes fails to enable the corresponding conntrack family. This change passes the selftests in iptables.git.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0bfcb7b71e735560077a42847f69597ec7dcc326Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4cdc55ec6222bb195995cc58f7cb46e4d8907056Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/85ff9a0f793ca52c527e75cd40a69c948627ebdePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8f482bb7e27b37f1f734bb9a8eeb28b23d59d189Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/997f67d813ce0cf5eb3cdb8f124da68141e91b6cPatch
Impacted products
Vendor Product Version
Linux Linux Version: 0269ea4937343536ec7e85649932bc8c9686ea78
Version: 0269ea4937343536ec7e85649932bc8c9686ea78
Version: 0269ea4937343536ec7e85649932bc8c9686ea78
Version: 0269ea4937343536ec7e85649932bc8c9686ea78
Version: 0269ea4937343536ec7e85649932bc8c9686ea78
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   Linux Linux Version: 2.6.30
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                        id: "CVE-2024-50038",
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                  "net/netfilter/xt_CT.c",
                  "net/netfilter/xt_IDLETIMER.c",
                  "net/netfilter/xt_LED.c",
                  "net/netfilter/xt_NFLOG.c",
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                  "net/netfilter/xt_addrtype.c",
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         title: "netfilter: xtables: avoid NFPROTO_UNSPEC where needed",
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   cveMetadata: {
      assignerOrgId: "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      assignerShortName: "Linux",
      cveId: "CVE-2024-50038",
      datePublished: "2024-10-21T19:39:38.451Z",
      dateReserved: "2024-10-21T12:17:06.070Z",
      dateUpdated: "2024-12-19T09:31:52.316Z",
      state: "PUBLISHED",
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Como esto solo es útil para restringir el tráfico TCP/UDP que termina localmente, regístrelo solo para la familia ipv4 e ipv6. Pablo señala que este es un problema general, los usuarios directos de la interfaz set/getsockopt pueden llamar a destinos/coincidencias que solo estaban destinados a usarse con tablas ip(6). Compruebe todas las coincidencias y objetivos UNSPEC para ver si hay problemas similares: - las coincidencias y los objetivos están bien excepto si asumen que skb_network_header() es válido - esto solo es cierto cuando se llama desde la capa inet: la pila ip(6) extrae el encabezado ip/ipv6 en el área de datos lineales. - los objetivos que devuelven XT_CONTINUE u otros veredictos de xtables también deben restringirse, son incompatibles con el traverser de ebtables, por ejemplo, EBT_CONTINUE es un valor completamente diferente de XT_CONTINUE. La mayoría de las coincidencias/objetivos se cambian para registrarse para NFPROTO_IPV4/IPV6, ya que se proporcionan para su uso por ip(6)tables. El objetivo MARK también lo usan arptables, así que regístrese también para NFPROTO_ARP. Mientras tanto, abandone si connbytes no puede habilitar la familia conntrack correspondiente. 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      vulnrichment: {
         containers: "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2024-50038\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-10-22T13:25:10.359959Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-10-22T13:25:13.522Z\"}}], \"cna\": {\"title\": \"netfilter: xtables: avoid NFPROTO_UNSPEC where needed\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"0269ea493734\", \"lessThan\": \"85ff9a0f793c\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"0269ea493734\", \"lessThan\": \"8f482bb7e27b\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"0269ea493734\", \"lessThan\": \"997f67d813ce\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"0269ea493734\", \"lessThan\": \"4cdc55ec6222\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"0269ea493734\", \"lessThan\": \"0bfcb7b71e73\", \"versionType\": \"git\"}], \"programFiles\": [\"net/netfilter/xt_CHECKSUM.c\", \"net/netfilter/xt_CLASSIFY.c\", \"net/netfilter/xt_CONNSECMARK.c\", \"net/netfilter/xt_CT.c\", \"net/netfilter/xt_IDLETIMER.c\", \"net/netfilter/xt_LED.c\", \"net/netfilter/xt_NFLOG.c\", \"net/netfilter/xt_RATEEST.c\", \"net/netfilter/xt_SECMARK.c\", \"net/netfilter/xt_TRACE.c\", \"net/netfilter/xt_addrtype.c\", \"net/netfilter/xt_cluster.c\", \"net/netfilter/xt_connbytes.c\", \"net/netfilter/xt_connlimit.c\", \"net/netfilter/xt_connmark.c\", \"net/netfilter/xt_mark.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"2.6.30\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"2.6.30\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.15.168\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.113\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.57\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.11.4\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.11.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12-rc3\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/netfilter/xt_CHECKSUM.c\", \"net/netfilter/xt_CLASSIFY.c\", \"net/netfilter/xt_CONNSECMARK.c\", \"net/netfilter/xt_CT.c\", \"net/netfilter/xt_IDLETIMER.c\", \"net/netfilter/xt_LED.c\", \"net/netfilter/xt_NFLOG.c\", \"net/netfilter/xt_RATEEST.c\", \"net/netfilter/xt_SECMARK.c\", \"net/netfilter/xt_TRACE.c\", \"net/netfilter/xt_addrtype.c\", \"net/netfilter/xt_cluster.c\", \"net/netfilter/xt_connbytes.c\", \"net/netfilter/xt_connlimit.c\", \"net/netfilter/xt_connmark.c\", \"net/netfilter/xt_mark.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/85ff9a0f793ca52c527e75cd40a69c948627ebde\"}, {\"url\": \"https://git.kernel.org/stable/c/8f482bb7e27b37f1f734bb9a8eeb28b23d59d189\"}, {\"url\": \"https://git.kernel.org/stable/c/997f67d813ce0cf5eb3cdb8f124da68141e91b6c\"}, {\"url\": \"https://git.kernel.org/stable/c/4cdc55ec6222bb195995cc58f7cb46e4d8907056\"}, {\"url\": \"https://git.kernel.org/stable/c/0bfcb7b71e735560077a42847f69597ec7dcc326\"}], \"x_generator\": {\"engine\": \"bippy-9e1c9544281a\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnetfilter: xtables: avoid NFPROTO_UNSPEC where needed\\n\\nsyzbot managed to call xt_cluster match via ebtables:\\n\\n WARNING: CPU: 0 PID: 11 at net/netfilter/xt_cluster.c:72 xt_cluster_mt+0x196/0x780\\n [..]\\n ebt_do_table+0x174b/0x2a40\\n\\nModule registers to NFPROTO_UNSPEC, but it assumes ipv4/ipv6 packet\\nprocessing.  As this is only useful to restrict locally terminating\\nTCP/UDP traffic, register this for ipv4 and ipv6 family only.\\n\\nPablo points out that this is a general issue, direct users of the\\nset/getsockopt interface can call into targets/matches that were only\\nintended for use with ip(6)tables.\\n\\nCheck all UNSPEC matches and targets for similar issues:\\n\\n- matches and targets are fine except if they assume skb_network_header()\\n  is valid -- this is only true when called from inet layer: ip(6) stack\\n  pulls the ip/ipv6 header into linear data area.\\n- targets that return XT_CONTINUE or other xtables verdicts must be\\n  restricted too, they are incompatbile with the ebtables traverser, e.g.\\n  EBT_CONTINUE is a completely different value than XT_CONTINUE.\\n\\nMost matches/targets are changed to register for NFPROTO_IPV4/IPV6, as\\nthey are provided for use by ip(6)tables.\\n\\nThe MARK target is also used by arptables, so register for NFPROTO_ARP too.\\n\\nWhile at it, bail out if connbytes fails to enable the corresponding\\nconntrack family.\\n\\nThis change passes the selftests in iptables.git.\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-11-05T09:53:57.437Z\"}}}",
         cveMetadata: "{\"cveId\": \"CVE-2024-50038\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-11-05T09:53:57.437Z\", \"dateReserved\": \"2024-10-21T12:17:06.070Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-10-21T19:39:38.451Z\", \"assignerShortName\": \"Linux\"}",
         dataType: "CVE_RECORD",
         dataVersion: "5.1",
      },
   },
}


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