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NTAP-20220325-0011 — CVE-2021-25217 ISC DHCP Vulnerability in NetApp Products

Published 2022-03-25 · Updated 2024-05-01 · Status: Final · Exploitation: Public · Severity: HIGH 7.4 · ONTAP affected: Yes

Official advisory: NTAP-20220325-0011 on security.netapp.com ↗. Affected versions, fixed releases, and workarounds live there — this page is a summary.

Product family: SolidFire / NetApp HCI · ONTAP | ONTAP-relevant | highest CVSS: 7.4

CVEs in this advisory

CVE-2021-25217 — HIGH · CVSS 7.4 · site index

What the CVE records say

CVE-2021-25217 — In ISC DHCP 4.1-ESV-R1 -> 4.1-ESV-R16, ISC DHCP 4.4.0 -> 4.4.2 (Other branches of ISC DHCP (i.e., releases in the 4.0.x series or lower and releases in the 4.3.x series) are beyond their End-of-Life (EOL) and no longer supported by ISC. From inspection it is clear that the defect is also present in releases from those series, but they have not been officially tested for the vulnerability), The outcome of encountering the defect while reading a lease that will trigger it varies, according to: the component being affected (i.e., dhclient or dhcpd) whether the package was built as a 32-bit or 64-bit binary whether the compiler flag -fstack-protection-strong was used when compiling In dhclient, ISC has not successfully reproduced the error on a 64-bit system. However, on a 32-bit system it is possible to cause dhclient to crash when reading an improper lease, which could cause network connectivity problems for an affected system due to the absence of a running DHCP client process. In dhcpd, when run in DHCPv4 or DHCPv6 mode: if the dhcpd server binary was built for a 32-bit architecture AND the -fstack-protection-strong flag was specified to the compiler, dhcpd may exit while parsing a lease file containing an objectionable lease, resulting in lack of service to clients. Additionally, the offending lease and the lease immediately following it in the lease database may be improperly deleted. if the dhcpd server binary was built for a 64-bit architecture OR if the -fstack-protection-strong compiler flag was NOT specified, the crash will not occur, but it is possible for the offending lease and the lease which immediately followed it to be improperly deleted.

Impact

Successful exploitation of this vulnerability could lead to Denial of Service (DoS).

Affected products

NetApp SolidFire & HCI Management Node
ONTAP Select Deploy administration utility

Official fixes

NetApp SolidFire & HCI Management Node — vendor fix ↗
NetApp SolidFire & HCI Management Node — vendor fix ↗
ONTAP Select Deploy administration utility — vendor fix ↗

References

https://kb.isc.org/docs/cve-2021-25217 ↗

What to do

Check the affected products listed above against the official advisory's affected-versions table — that is where the exact ONTAP 9 release, ONTAP tool, or management product versions are named.
If affected and a fixed release exists, plan the upgrade — see the ONTAP upgrade runbook.
If exploitation is listed as "active", treat remediation as urgent and review exposure (management LIFs, ONTAP S3, SnapMirror endpoints).
Harden in parallel: security hardening baseline and ransomware protection on ONTAP.