isc-dhcp-client: A malicious client which is allowed to send very large amounts of traffic (billions of packets) to a DHCP server can...
CVE-2018-5733 is fixed in 6 products on 1 platform, first by isc-dhcp-client 4.3.5-3ubuntu5, released February 28, 2018. It is not reported as exploited. Patch Radar priority: Routine.
A malicious client which is allowed to send very large amounts of traffic (billions of packets) to a DHCP server can eventually overflow a 32-bit reference counter, potentially causing dhcpd to crash. Affects ISC DHCP 4.1.0 -> 4.1-ESV-R15, 4.2.0 -> 4.2.8, 4.3.0 -> 4.3.6, 4.4.0.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| isc-dhcp-client · Ubuntu 18.04.6 LTS (bionic) | 4.3.5-3ubuntu5 | isc-dhcp-client 4.3.5-3ubuntu5 | Feb 28, 2018 |
| isc-dhcp-client-ddns · Ubuntu 18.04.6 LTS (bionic) | 4.3.5-3ubuntu5 | isc-dhcp-client-ddns 4.3.5-3ubuntu5 | Feb 28, 2018 |
| isc-dhcp-common · Ubuntu 18.04.6 LTS (bionic) | 4.3.5-3ubuntu5 | isc-dhcp-common 4.3.5-3ubuntu5 | Feb 28, 2018 |
| isc-dhcp-relay · Ubuntu 18.04.6 LTS (bionic) | 4.3.5-3ubuntu5 | isc-dhcp-relay 4.3.5-3ubuntu5 | Feb 28, 2018 |
| isc-dhcp-server · Ubuntu 18.04.6 LTS (bionic) | 4.3.5-3ubuntu5 | isc-dhcp-server 4.3.5-3ubuntu5 | Feb 28, 2018 |
| isc-dhcp-server-ldap · Ubuntu 18.04.6 LTS (bionic) | 4.3.5-3ubuntu5 | isc-dhcp-server-ldap 4.3.5-3ubuntu5 | Feb 28, 2018 |
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