Allele Security Alert
ASA-2019-00497, CVE-2019-12257, VXW6-87101
Heap overflow in DHCP Offer/ACK parsing in ipdhcpc
Wind River VxWorks
Wind River VxWorks 6 versions 6.6, 6.7 and 6.8
Wind River VxWorks 6 versions 6.9.x before 6.9.4
Wind River VxWorks 6 versions 6.9.4 and later
Proof of concept
A specially crafted DHCP packet may cause overflow of heap-allocated memory on VxWorks system using DHCP. The attacker must share LAN with the device as DHCP packets is not forwarded by IP-routers.
This vulnerability only affects systems that use the included DHCP client. DHCP packets may go past the local area network (LAN) via DHCP relays, but is otherwise confined to the LAN. The DHCP client may be used in VxWorks and in the bootrom. Bootrom using DHCP/BOOTP is only vulnerable during the boot process, not after the VxWorks image has booted. This defect may be used to overwrite the heap, which most likely results in a crash later on a task requesting memory from the heap. In the worst-case scenario, this vulnerability can potentially lead to RCE.
Ben Seri (Armis)
SECURITY ADVISORY: WIND RIVER TCP/IP STACK (IPNET) VULNERABILITIES
SECURITY VULNERABILITY RESPONSE INFORMATION – TCP/IP Network Stack (IPnet, Urgent/11)
URGENT/11 Information from the Research Team – Armis Labs
Critical vulnerabilities to remotely compromise VxWorks, the most popular RTOS
Critical Zero Days Remotely Compromise the Most Popular Real-Time OS
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Last modified: August 12, 2019