cve-2024-38558
Vulnerability from cvelistv5
Published
2024-06-19 13:35
Modified
2024-08-02 04:12
Severity
Summary
net: openvswitch: fix overwriting ct original tuple for ICMPv6
References
SourceURLTags
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0b532f59437f688563e9c58bdc1436fefa46e3b5
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/431e9215576d7b728f3f53a704d237a520092120
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/483eb70f441e2df66ade78aa7217e6e4caadfef3
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5ab6aecbede080b44b8e34720ab72050bf1e6982
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6a51ac92bf35d34b4996d6eb67e2fe469f573b11
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/78741b4caae1e880368cb2f5110635f3ce45ecfd
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7c988176b6c16c516474f6fceebe0f055af5eb56
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9ec8b0ccadb908d92f7ee211a4eff05fd932f3f6
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d73fb8bddf89503c9fae7c42e50d44c89909aad6
Impacted products
VendorProduct
LinuxLinux
LinuxLinux
Show details on NVD website

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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: openvswitch: fix overwriting ct original tuple for ICMPv6\n\nOVS_PACKET_CMD_EXECUTE has 3 main attributes:\n - OVS_PACKET_ATTR_KEY - Packet metadata in a netlink format.\n - OVS_PACKET_ATTR_PACKET - Binary packet content.\n - OVS_PACKET_ATTR_ACTIONS - Actions to execute on the packet.\n\nOVS_PACKET_ATTR_KEY is parsed first to populate sw_flow_key structure\nwith the metadata like conntrack state, input port, recirculation id,\netc.  Then the packet itself gets parsed to populate the rest of the\nkeys from the packet headers.\n\nWhenever the packet parsing code starts parsing the ICMPv6 header, it\nfirst zeroes out fields in the key corresponding to Neighbor Discovery\ninformation even if it is not an ND packet.\n\nIt is an \u0027ipv6.nd\u0027 field.  However, the \u0027ipv6\u0027 is a union that shares\nthe space between \u0027nd\u0027 and \u0027ct_orig\u0027 that holds the original tuple\nconntrack metadata parsed from the OVS_PACKET_ATTR_KEY.\n\nND packets should not normally have conntrack state, so it\u0027s fine to\nshare the space, but normal ICMPv6 Echo packets or maybe other types of\nICMPv6 can have the state attached and it should not be overwritten.\n\nThe issue results in all but the last 4 bytes of the destination\naddress being wiped from the original conntrack tuple leading to\nincorrect packet matching and potentially executing wrong actions\nin case this packet recirculates within the datapath or goes back\nto userspace.\n\nND fields should not be accessed in non-ND packets, so not clearing\nthem should be fine.  Executing memset() only for actual ND packets to\navoid the issue.\n\nInitializing the whole thing before parsing is needed because ND packet\nmay not contain all the options.\n\nThe issue only affects the OVS_PACKET_CMD_EXECUTE path and doesn\u0027t\naffect packets entering OVS datapath from network interfaces, because\nin this case CT metadata is populated from skb after the packet is\nalready parsed."
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    "dateReserved": "2024-06-18T19:36:34.921Z",
    "dateUpdated": "2024-08-02T04:12:25.358Z",
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However, the \u0027ipv6\u0027 is a union that shares\\nthe space between \u0027nd\u0027 and \u0027ct_orig\u0027 that holds the original tuple\\nconntrack metadata parsed from the OVS_PACKET_ATTR_KEY.\\n\\nND packets should not normally have conntrack state, so it\u0027s fine to\\nshare the space, but normal ICMPv6 Echo packets or maybe other types of\\nICMPv6 can have the state attached and it should not be overwritten.\\n\\nThe issue results in all but the last 4 bytes of the destination\\naddress being wiped from the original conntrack tuple leading to\\nincorrect packet matching and potentially executing wrong actions\\nin case this packet recirculates within the datapath or goes back\\nto userspace.\\n\\nND fields should not be accessed in non-ND packets, so not clearing\\nthem should be fine.  Executing memset() only for actual ND packets to\\navoid the issue.\\n\\nInitializing the whole thing before parsing is needed because ND packet\\nmay not contain all the options.\\n\\nThe issue only affects the OVS_PACKET_CMD_EXECUTE path and doesn\u0027t\\naffect packets entering OVS datapath from network interfaces, because\\nin this case CT metadata is populated from skb after the packet is\\nalready parsed.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: openvswitch: corrige la sobrescritura de la tupla original de ct para ICMPv6 OVS_PACKET_CMD_EXECUTE tiene 3 atributos principales: - OVS_PACKET_ATTR_KEY - Metadatos de paquetes en formato netlink. - OVS_PACKET_ATTR_PACKET: contenido del paquete binario. - OVS_PACKET_ATTR_ACTIONS: acciones a ejecutar en el paquete. 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