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.
Solution:
The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.
| Link | Tags |
|---|---|
| https://kb.isc.org/docs/aa-01567 | vendor advisory |
| https://access.redhat.com/errata/RHSA-2018:0469 | third party advisory vendor advisory |
| https://www.debian.org/security/2018/dsa-4133 | third party advisory vendor advisory |
| https://usn.ubuntu.com/3586-2/ | third party advisory vendor advisory |
| https://access.redhat.com/errata/RHSA-2018:0483 | third party advisory vendor advisory |
| https://usn.ubuntu.com/3586-1/ | third party advisory vendor advisory |
| http://www.securityfocus.com/bid/103188 | vdb entry third party advisory |
| http://www.securitytracker.com/id/1040437 | vdb entry third party advisory |
| https://lists.debian.org/debian-lts-announce/2018/03/msg00015.html | third party advisory mailing list |
| https://security.netapp.com/advisory/ntap-20250425-0010/ |