Amazon Linux 2 : ipa (ALAS-2026-3916)

critical Nessus Plugin ID 344422

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Synopsis

The remote Amazon Linux 2 host is missing a security update.

Description

It is, therefore, affected by a vulnerability as referenced in the ALAS2-2026-3916 advisory.

A flaw was found in FreeIPA. The self-managed OTP token ACI does not require authentication and does not restrict which attributes may be added alongside the token entry. An unauthenticated LDAP client can exploit this, combined with a related flaw in the underlying directory server's ACI evaluation (tracked separately), to create an arbitrary attacker-controlled Kerberos principal and have it added to the administrators group. This allows a remote, unauthenticated attacker to obtain genuine FreeIPA administrator-group membership and perform administrative operations against the directory and, on SID- enabled deployments, other IdM services. (CVE-2026-76578)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Run 'yum update ipa' or or 'yum update --advisory ALAS2-2026-3916' to update your system.

Plugin Details

Severity: Critical

ID: 344422

File Name: al2_ALAS-2026-3916.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Amazon Linux Local Security Checks

Published: 9/9/2026

Updated: 9/9/2026

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Continuous Assessment, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.19

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.4

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

CVSS Score Source: CVE-2026-76578

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:amazon:linux:2, p-cpe:/a:amazon:linux:ipa-client-common, p-cpe:/a:amazon:linux:ipa-client, p-cpe:/a:amazon:linux:ipa-common, p-cpe:/a:amazon:linux:ipa-debuginfo, p-cpe:/a:amazon:linux:ipa-python-compat, p-cpe:/a:amazon:linux:ipa-server-common, p-cpe:/a:amazon:linux:ipa-server-dns, p-cpe:/a:amazon:linux:ipa-server-trust-ad, p-cpe:/a:amazon:linux:ipa-server, p-cpe:/a:amazon:linux:python2-ipaclient, p-cpe:/a:amazon:linux:python2-ipalib, p-cpe:/a:amazon:linux:python2-ipaserver

Required KB Items: Host/local_checks_enabled, Host/AmazonLinux/release, Host/AmazonLinux/rpm-list

Exploit Ease: No known exploits are available

Patch Publication Date: 9/8/2026

Vulnerability Publication Date: 9/7/2026

Reference Information

CVE: CVE-2026-76578

Detections

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