Description
ISC DHCP server 4.2 before 4.2.0-P2, when configured to use failover partnerships, allows remote attackers to cause a denial of service (communications-interrupted state and DHCP client service loss) by connecting to a port that is only intended for a failover peer, as demonstrated by a Nagios check_tcp process check to TCP port 520.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | dhcp | 4.3.3.P1-3.1 | openSUSE-SU-2024:10358-1 |
Advisories 1
- openSUSE-SU-2024:10358-1 dhcp-4.3.3.P1-3.1 on GA media SUSE / openSUSE Security Updates · May 7, 2025
References
- FEDORA-2010-18856 vendor-advisory
- 42618 third-party-advisory
- ADV-2010-3208 vdb-entry
- ADV-2011-0052 vdb-entry
- [dhcp-users] 20101207 nagios check_tcp kills failover, then dhcp failure. mailing-list
- https://www.isc.org/software/dhcp/advisories/cve-2010-3616
- VU#159528 third-party-advisory
- 1024862 vdb-entry
- MDVSA-2011:001 vendor-advisory
- 45360 vdb-entry
- 42682 third-party-advisory