Integer overflow in Isc Dhcp
CVE-2018-5733
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.
Vulnerability class: Integer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.202 (97.4th percentile), scored .
Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 97th percentile — 97.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.202 · newest: 0.202 · change: 0.000
Affected products
- Isc Dhcp — versions 4.1-esv, 4.1.0, 4.4.0
- Isc Dhcp — versions ISC DHCP 4.1.0 -> 4.1-ESV-R15, 4.2.0 -> 4.2.8, 4.3.0 -> 4.3.6, 4.4.0
- Canonical Ubuntu Linux — versions 14.04, 16.04, 17.10
- Debian Linux — versions 7.0, 8.0, 9.0
- Red Hat Enterprise Linux Desktop — versions 6.0, 7.0
- Red Hat Enterprise Linux Server — versions 6.0, 7.0
- Red Hat Enterprise Linux Server Aus — versions 7.4, 7.6
- Red Hat Enterprise Linux Server Eus — versions 7.4, 7.5, 7.6
- Red Hat Enterprise Linux Workstation — versions 6.0, 7.0
Weakness classification (CWE)
References
- kb.isc.org/docs/aa-01567 (Vendor Advisory)
- access.redhat.com/errata/RHSA-2018:0469 (vendor-advisory, Third Party Advisory)
- www.debian.org/security/2018/dsa-4133 (vendor-advisory, Third Party Advisory)
- usn.ubuntu.com/3586-2/ (vendor-advisory, Third Party Advisory)
- access.redhat.com/errata/RHSA-2018:0483 (vendor-advisory, Third Party Advisory)
- usn.ubuntu.com/3586-1/ (vendor-advisory, Third Party Advisory)
- www.securityfocus.com/bid/103188 (VDB Entry, Third Party Advisory, vdb-entry)
- www.securitytracker.com/id/1040437 (VDB Entry, Third Party Advisory, vdb-entry)
- lists.debian.org/debian-lts-announce/2018/03/msg00015.html (mailing-list, Third Party Advisory)
- af854a3a-2127-422b-91ae-364da2661108
Frequently asked questions
- What is CVE-2018-5733?
- CVE-2018-5733 is a high-severity vulnerability in Isc Dhcp, classified under Integer Overflow or Wraparound. CVSS score: 7.5/10. Published 2019-01-16.
- How severe is CVE-2018-5733?
- High severity. CVSS v3 base score is 7.5 out of 10.