360 lines
18 KiB
JSON
360 lines
18 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"cveMetadata": {
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"cveId": "CVE-2024-35962",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2024-05-17T13:50:33.137Z",
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"datePublished": "2024-05-20T09:41:53.207Z",
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"dateUpdated": "2026-10-15T00:41:44.521Z"
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},
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"containers": {
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"cna": {
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T11:31:13.953Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: complete validation of user input\n\nIn my recent commit, I missed that do_replace() handlers\nuse copy_from_sockptr() (which I fixed), followed\nby unsafe copy_from_sockptr_offset() calls.\n\nIn all functions, we can perform the @optlen validation\nbefore even calling xt_alloc_table_info() with the following\ncheck:\n\nif ((u64)optlen < (u64)tmp.size + sizeof(tmp))\n return -EINVAL;"
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
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"baseScore": 7.1,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - The vulnerability is reached through the local `setsockopt(SOL_IP, IPT_SO_SET_REPLACE, ...)` syscall on a locally-opened socket, via `nf_setsockopt()` → `do_ipt_set_ctl()` → `do_replace()`. No network packet or remote peer data reaches this code path.\nAC:L - The attacker fully controls `tmp.size` and `optlen` and triggers the oversized `memcpy()` deterministically on every call — no race, no memory-layout luck, and no retry needed. The kernel-sockptr precondition is satisfied by any attached cgroup/setsockopt BPF program (even a no-op one, since `ctx.optlen` defaults to the original `optlen`), which is standard in container environments running Cilium and similar tooling on default `CONFIG_CGROUP_BPF=y` kernels.\nPR:L - `do_ipt_set_ctl()` gates on `ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)`, which any unprivileged user obtains with `unshare -Urn`; entering a new user/net namespace leaves cgroup membership intact so the BPF sockopt hook still applies. No real root in the initial namespace is required.\nUI:N - The attacker performs the entire sequence — socket creation, namespace setup, and the malformed setsockopt call — with no action by any other user or victim process.\nS:U - The out-of-bounds read occurs in kernel slab memory and its impact is confined to the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - This is an unbounded out-of-bounds read — up to `XT_MAX_TABLE_SIZE` (512 MB) copied from a ≤PAGE_SIZE slab object into the netfilter table buffer, far beyond a \"few bytes\". With heap grooming to keep the resulting `ipt_entry` chain valid through `translate_table()`, the harvested kernel heap contents (pointers, keys, credentials, defeating KASLR) can be read back via `getsockopt(IPT_SO_GET_ENTRIES)`.\nI:N - The defect is purely an over-read; the destination buffer is correctly sized by `xt_alloc_table_info(tmp.size)`, so no memory outside an allocation is written and no control-flow or data corruption primitive is produced.\nA:H - A large attacker-chosen `tmp.size` makes the kernel `memcpy()` run hundreds of megabytes past the end of a small slab object, reliably hitting unmapped memory and causing a page fault in kernel context — an oops/panic — and the crash is trivially repeatable by any unprivileged local user."
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}
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}
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"programFiles": [
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"net/ipv4/netfilter/arp_tables.c",
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"net/ipv4/netfilter/ip_tables.c",
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"net/ipv6/netfilter/ip6_tables.c"
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],
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"net/ipv4/netfilter/arp_tables.c",
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"net/ipv4/netfilter/ip_tables.c",
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"net/ipv6/netfilter/ip6_tables.c"
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