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Fencer Intel
high 7.8

CVE-2016-9566 json

base/logging.c in Nagios Core before 4.2.4 allows local users with access to an account in the nagios group to gain root privileges via a s…

published 2016-12-15 9 y ago modified 2026-06-17 4 mo ago also EUVD-2016-10372

cvss
7.8
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
4.9%
EPSS 4.9% chance of exploitation in 30 days, percentile 92%
public exploits
1
Exploit-DB

Summary

base/logging.c in Nagios Core before 4.2.4 allows local users with access to an account in the nagios group to gain root privileges via a symlink attack on the log file. NOTE: this can be leveraged by remote attackers using CVE-2016-9565.

Patch / fix

  • nagios3 Ubuntu 14.04 LTS 3.5.1-1ubuntu1.1
  • nagios3 Ubuntu 16.04 LTS 3.5.1.dfsg-2.1ubuntu1.1

ubuntu advisories UBUNTU-CVE-2016-9566

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • nagios storage 3.1, openstack 7, openstack 6 +1 more 3.5.1-9.el7
  • nagios-common storage 3.1, openstack 7, openstack 6 +1 more 3.5.1-9.el7
  • nagios storage 3.1, openstack 5 3.5.1-9.el6
  • nagios-common storage 3.1, openstack 5 3.5.1-9.el6

red hat advisories RHSA-2017:0258RHSA-2017:0259RHSA-2017:0211RHSA-2017:0214RHSA-2017:0213RHSA-2017:0212

  • hwdata Manager Client Tools 12 0.314-10.14.1
  • icinga Manager Client Tools 12-BETA, Manager Client Tools 12 1.13.3-12.8.1
  • zeromq SLE Workstation Extension 12 SP5, SLE Software Development Kit 12 SP5, SLE Module for Advanced Systems Management 12 +2 more 4.0.4-15.8.1
  • sysuser-tools SLES for SAP 12 SP5, SLES 12 SP5, SLE Module for Containers 12 +2 more 2.0-1.9.1
  • grafana-sap-providers Manager Client Tools 12-BETA, Manager Client Tools 12 1.1-1.7.1
  • grafana-ha-cluster-dashboards Manager Client Tools 12-BETA, Manager Client Tools 12 1.1.0+git.1605027022.a84d536-1.10.1
  • grafana-sap-netweaver-dashboards Manager Client Tools 12-BETA, Manager Client Tools 12 1.0.3+git.1601889366.9f71957-1.10.1
  • icinga Manager Client Tools 12 1.13.3-12.6.1

suse advisories SUSE-SU-2024:1629-1SUSE-SU-2022:3576-1

  • nagios openSUSE Tumbleweed 4.4.6-2.5

opensuse advisories openSUSE-SU-2024:11073-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2016-9566 updated cvss 7.3

nagios: Privilege escalation issue

  • Red Hat Mobile Application Platform 4 nagios
    affected: no fix available
  • Red Hat Enterprise Linux OpenStack Platform 5.0 (Icehouse) for RHEL 6 nagios 3.5.1-9.el6, nagios-common 3.5.1-9.el6
    fixed: vendor fix RHSA-2017:0212
  • Red Hat Enterprise Linux OpenStack Platform 5.0 (Icehouse) for RHEL 7 nagios 3.5.1-9.el7, nagios-common 3.5.1-9.el7
    fixed: vendor fix RHSA-2017:0211
  • Red Hat Enterprise Linux OpenStack Platform 6.0 (Juno) for RHEL 7 nagios 3.5.1-9.el7, nagios-common 3.5.1-9.el7
    fixed: vendor fix RHSA-2017:0213
  • Red Hat Enterprise Linux OpenStack Platform 7.0 (Kilo) for RHEL 7 nagios 3.5.1-9.el7, nagios-common 3.5.1-9.el7
    fixed: vendor fix RHSA-2017:0214
  • Red Hat Gluster Storage Nagios 3.1 on RHEL-6 nagios 3.5.1-9.el6, nagios-common 3.5.1-9.el6
    fixed: vendor fix RHSA-2017:0259
  • Red Hat Gluster Storage Nagios 3.1 on RHEL-7 nagios 3.5.1-9.el7, nagios-common 3.5.1-9.el7
    fixed: vendor fix RHSA-2017:0258
  • Red Hat Gluster Storage Server 3.1 on RHEL-6 nagios 3.5.1-9.el6, nagios-common 3.5.1-9.el6
    fixed: vendor fix RHSA-2017:0259
show 2 more
  • Red Hat Gluster Storage Server 3.1 on RHEL-7 nagios 3.5.1-9.el7, nagios-common 3.5.1-9.el7
    fixed: vendor fix RHSA-2017:0258
  • Red Hat OpenStack Platform 8 (Liberty) nagios Red Hat OpenStack Platform 9 (Mitaka) nagios Red Hat OpenStack Platform 10 (Newton) nagios
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Timeline

  1. First public exploit (EDB-40921)
  2. Published

Exploit prediction

4.88% chance of exploitation in the next 30 days, higher than 92% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • EDB-40921 Nagios < 4.2.4 - Local Privilege Escalation local, 2016-12-15
  • legalhackers.com https://legalhackers.com/advisories/Nagios-Exploit-Root-PrivEsc-CVE-2016-9566.html referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.0 7.8 CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.2 AV:L/AC:L/Au:N/C:C/I:C/A:C

Classification

Weakness
  • CWE-59 Improper Link Resolution Before File Access
  • CWE-264 Permissions, Privileges, and Access Controls

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.