346 lines
15 KiB
JSON
346 lines
15 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"cveMetadata": {
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"cveId": "CVE-2026-29004",
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"state": "PUBLISHED",
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"dateReserved": "2026-03-03T16:42:01.012Z",
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"shortName": "VulnCheck",
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"dateUpdated": "2026-05-06T13:07:29.996Z"
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},
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"title": "BusyBox DHCPv6 Client Heap Buffer Overflow via DNS_SERVERS",
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"descriptions": [
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{
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"lang": "en",
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"value": "BusyBox before commit 42202bf contains a heap buffer overflow vulnerability in the DHCPv6 client (udhcpc6) DNS_SERVERS option handler in networking/udhcp/d6_dhcpc.c that allows network-adjacent attackers to trigger memory corruption by sending a crafted DHCPv6 response with a malformed D6_OPT_DNS_SERVERS option. Attackers can exploit incorrect heap buffer allocation calculations in the option_to_env() function to cause denial of service or achieve arbitrary code execution on embedded systems without heap hardening."
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}
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"Safety": "NOT_DEFINED",
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"url": "https://y637f9qq2x.com/posts/busybox-dhcpv6-heap-overflow/",
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"credits": [
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"title": "BusyBox: BusyBox: Arbitrary Code Execution via DHCPv6 Client Heap Buffer Overflow",
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{
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"lang": "en",
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"value": "To mitigate this vulnerability, restrict network access to systems running BusyBox as a DHCPv6 client, ensuring that only trusted DHCPv6 servers can communicate with it. If the DHCPv6 client functionality is not essential for the system's operation, consider disabling the `udhcpc6` service or configuring it to only accept responses from known, trusted sources. Consult product-specific documentation for details on managing network services and configurations. Any changes to network service configurations may require a service restart to take effect, potentially impacting network connectivity."
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}
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