NULL pointer dereference in Isc Dhcp
CVE-2022-2928
In ISC DHCP 4.4.0 -> 4.4.3, ISC DHCP 4.1-ESV-R1 -> 4.1-ESV-R16-P1, when the function option_code_hash_lookup() is called from add_option(), it increases the option's refcount field. However, there is not a corresponding call to option_dereference() to decrement the refcount field. The function add_option() is only used in server responses to lease query packets. Each lease query response calls this function for several options, so eventually, the reference counters could overflow and cause the server to abort.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.007 (50.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 51st percentile — 50.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: +0.000
Affected products
- Isc Dhcp — versions 4.1-esv
- Isc Dhcp — versions 4.4.0 through versions before 4.4.3-P1, 4.1 ESV 4.1-ESV-R1 through versions before 4.1-ESV-R16-P1
- Debian Linux — versions 10.0
- Fedoraproject Fedora — versions 35, 36, 37
Weakness classification (CWE)
Public proof-of-concept exploits
References
- kb.isc.org/docs/cve-2022-2928 (Vendor Advisory)
- lists.debian.org/debian-lts-announce/2022/10/msg00015.html (mailing-list, Mailing List, Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- security.gentoo.org/glsa/202305-22 (vendor-advisory)
Frequently asked questions
- What is CVE-2022-2928?
- CVE-2022-2928 is a medium-severity vulnerability in Isc Dhcp, classified under NULL Pointer Dereference. CVSS score: 6.5/10. Published 2022-10-07.
- How severe is CVE-2022-2928?
- Medium severity. CVSS v3 base score is 6.5 out of 10.
- Is CVE-2022-2928 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.