Amazon Linux 2 : sssd, --advisory ALAS2-2026-3828 (ALAS-2026-3828)

high Nessus Plugin ID 332017

Synopsis

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

Description

The version of sssd installed on the remote host is prior to 1.16.5-12. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2026-3828 advisory.

A flaw was found in sssd. When authenticating with a YubiKey, the SSSD PAM responder can crash due to a use-after-free vulnerability, where a memory pointer is incorrectly handled. A local attacker could exploit this flaw by manipulating smartcard or YubiKey contents, leading to a denial of service that disrupts authentication. This vulnerability also presents a potential for privilege escalation, although it is difficult to exploit. (CVE-2026-12610)

A flaw was found in SSSD's LDAP sudo provider. When the ldap_sudo_search_base option is not explicitly configured, SSSD searches the entire LDAP directory tree for sudoRole objects. An authenticated attacker with write access to any subtree can inject a sudoRole object granting root-level sudo privileges on all SSSD-enrolled hosts. (CVE-2026-14474)

A path traversal flaw was found in SSSD's AD GPO provider. The ad_gpo_extract_smb_components() function does not sanitize .. sequences in the gPCFileSysPath LDAP attribute, allowing an attacker with AD GPO management access to write files outside the GPO cache directory as root. On default RHEL configurations with SELinux enforcing, this can be used to inject Kerberos configuration leading to authentication bypass. (CVE-2026-14476)

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 sssd' or or 'yum update --advisory ALAS2-2026-3828' to update your system.

Plugin Details

Severity: High

ID: 332017

File Name: al2_ALAS-2026-3828.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Amazon Linux Local Security Checks

Published: 8/4/2026

Updated: 8/4/2026

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

Risk Information

VPR

Risk Factor: Medium

Score: 5

Percentile: 94.1

CVSS v2

Risk Factor: High

Base Score: 9

Temporal Score: 6.7

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

CVSS Score Source: CVE-2026-14474

CVSS v3

Risk Factor: High

Base Score: 8.8

Temporal Score: 7.7

Vector: CVSS:3.0/AV:N/AC:L/PR:L/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:libipa_hbac-devel, p-cpe:/a:amazon:linux:libipa_hbac, p-cpe:/a:amazon:linux:libsss_autofs, p-cpe:/a:amazon:linux:libsss_certmap-devel, p-cpe:/a:amazon:linux:libsss_certmap, p-cpe:/a:amazon:linux:libsss_idmap-devel, p-cpe:/a:amazon:linux:libsss_idmap, p-cpe:/a:amazon:linux:libsss_nss_idmap-devel, p-cpe:/a:amazon:linux:libsss_nss_idmap, p-cpe:/a:amazon:linux:libsss_simpleifp-devel, p-cpe:/a:amazon:linux:libsss_simpleifp, p-cpe:/a:amazon:linux:libsss_sudo, p-cpe:/a:amazon:linux:python-libipa_hbac, p-cpe:/a:amazon:linux:python-libsss_nss_idmap, p-cpe:/a:amazon:linux:python-sss-murmur, p-cpe:/a:amazon:linux:python-sss, p-cpe:/a:amazon:linux:python-sssdconfig, p-cpe:/a:amazon:linux:sssd-ad, p-cpe:/a:amazon:linux:sssd-client, p-cpe:/a:amazon:linux:sssd-common-pac, p-cpe:/a:amazon:linux:sssd-common, p-cpe:/a:amazon:linux:sssd-dbus, p-cpe:/a:amazon:linux:sssd-debuginfo, p-cpe:/a:amazon:linux:sssd-ipa, p-cpe:/a:amazon:linux:sssd-kcm, p-cpe:/a:amazon:linux:sssd-krb5-common, p-cpe:/a:amazon:linux:sssd-krb5, p-cpe:/a:amazon:linux:sssd-ldap, p-cpe:/a:amazon:linux:sssd-libwbclient-devel, p-cpe:/a:amazon:linux:sssd-libwbclient, p-cpe:/a:amazon:linux:sssd-polkit-rules, p-cpe:/a:amazon:linux:sssd-proxy, p-cpe:/a:amazon:linux:sssd-tools, p-cpe:/a:amazon:linux:sssd-winbind-idmap, p-cpe:/a:amazon:linux:sssd

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

Exploit Ease: No known exploits are available

Patch Publication Date: 8/4/2026

Vulnerability Publication Date: 6/30/2026

Reference Information

CVE: CVE-2026-12610, CVE-2026-14474, CVE-2026-14476

Detections

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