4.9 MEDIUM
- CVSS version (CVSS): 3.1
- Attack Vector (AV): Network (N)
- Attack Complexity (AC): Low (L)
- Privileges Required (PR): High (H)
- User Interaction (UI): None (N)
- Scope (S): Unchanged (U)
- Confidentiality (C): None (N)
- Integrity (I): None (N)
- Availability (A): High (H)
- Modified Attack Vector (MAV): Network (N)
- Modified Attack Complexity (MAC): Low (L)
- Modified Privileges Required (MPR): High (H)
- Modified User Interaction (MUI): None (N)
- Modified Confidentiality (MC): None (N)
- Modified Scope (MS): Unchanged (U)
- Modified Integrity (MI): None (N)
- Modified Availability (MA): High (H)
Activity log
- Created suggestion
Dhcp-server: dhcp-server: persistent denial of service due to buffer overflow via omapi
A flaw was found in dhcp-server. A remote attacker with network access to the OMAPI (Open Management Application Programming Interface) port, especially if not secured with TSIG (Transaction Signature) key authentication, could send a specially crafted lease creation request. This request, containing an overly long InfiniBand MAC address, triggers a buffer overflow in the `print_hw_addr()` function. Successful exploitation leads to a persistent denial of service (DoS), causing the `dhcpd` service to crash and preventing it from restarting without manual intervention.
References
Affected products
Matching in nixpkgs
pkgs.dhcpm
CLI tool for constructing & sending DHCP messages
pkgs.dhcpcd
Client for the Dynamic Host Configuration Protocol (DHCP)
pkgs.dhcpig
Tool to perform advanced DHCP exhaustion attack
pkgs.dhcping
Send DHCP request to find out if a DHCP server is running
pkgs.odhcp6c
Embedded DHCPv6-client for OpenWrt
-
nixos-unstable 0-unstable-2026-01-25
- nixpkgs-unstable 0-unstable-2026-01-25
- nixos-unstable-small 0-unstable-2026-01-25
-
nixos-26.05 0-unstable-2026-01-25
- nixos-26.05-small 0-unstable-2026-01-25
- nixpkgs-26.05-darwin 0-unstable-2026-01-25
pkgs.dhcpdump
Tool for visualization of DHCP packets as recorded and output by tcpdump to analyze DHCP server responses
pkgs.python313Packages.aiodhcpwatcher
Watch for DHCP packets with asyncio
Package maintainers
-
@NickCao Nick Cao <nickcao@nichi.co>
-
@Tochiaha Tochukwu Ahanonu <tochiahan@proton.me>
-
@jmbaur Jared Baur <jaredbaur@fastmail.com>
-
@felbinger Nico Felbinger <nico@felbinger.eu>
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@mweinelt Martin Weinelt <hexa@darmstadt.ccc.de>