Amazon Linux 2 : ipa (ALAS-2026-3950)

high Nessus Plugin ID 351067

Synopsis

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

Description

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2026-3950 advisory.

A flaw was found in FreeIPA. An unauthenticated remote attacker could exploit a DOM Cross-Site Scripting (XSS) vulnerability in the FreeIPA/IdM Web UI password reset page. By enticing a victim to click a specially crafted link and complete a password reset, the attacker could inject and execute arbitrary JavaScript code. This allows the attacker to perform actions within the victim's authenticated session, potentially leading to full administrative control if an IdM administrator is targeted. (CVE-2026-18147)

A flaw was found in FreeIPA. A remote, unauthenticated attacker can exploit this vulnerability by sending oversized form POST requests to the `/ipa/migration/migration.py` endpoint. This can force the migration handler to read attacker-controlled request bodies fully into memory, leading to increased memory usage, slower request handling, and potential service disruption or denial of service. (CVE-2026-73197)

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

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

Solution

Run 'yum update ipa' or or 'yum update --advisory ALAS2-2026-3950' to update your system.

Plugin Details

Severity: High

ID: 351067

File Name: al2_ALAS-2026-3950.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Amazon Linux Local Security Checks

Published: 9/29/2026

Updated: 9/29/2026

Supported Sensors: Nessus Agent, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.3

Percentile: 53.41

CVSS v2

Risk Factor: High

Base Score: 9.4

Temporal Score: 7

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

CVSS Score Source: CVE-2026-18147

CVSS v3

Risk Factor: High

Base Score: 8.1

Temporal Score: 7.1

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

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: 9/28/2026

Vulnerability Publication Date: 8/20/2026

Reference Information

CVE: CVE-2026-18147, CVE-2026-73197

Detections

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