Описание
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.
A flaw was found in BusyBox. A heap buffer overflow vulnerability exists in the Dynamic Host Configuration Protocol version 6 (DHCPv6) client, specifically within the option_to_env() function. Network-adjacent attackers can exploit this by sending a crafted DHCPv6 response containing a malformed D6_OPT_DNS_SERVERS option. This can lead to memory corruption, potentially allowing for arbitrary code execution or denial of service on affected embedded systems lacking heap hardening.
Меры по смягчению последствий
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.
Затронутые пакеты
| Платформа | Пакет | Состояние | Рекомендация | Релиз |
|---|---|---|---|---|
| Red Hat Enterprise Linux 6 | busybox | Not affected | ||
| Red Hat Hardened Images | busybox-main-1.37.0-7.3.hum1 | Fixed | RHSA-2026:30652 | 28.06.2026 |
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Дополнительная информация
Статус:
EPSS
8.8 High
CVSS3
Связанные уязвимости
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.
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.
BusyBox before commit 42202bf contains a heap buffer overflow vulnerab ...
EPSS
8.8 High
CVSS3