Amazon Linux 2023 : libipa_hbac, libipa_hbac-devel, libsss_autofs (ALAS2023-2026-1984)

high Nessus Plugin ID 328460

Synopsis

The remote Amazon Linux 2023 host is missing a security update.

Description

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-1984 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)

A flaw was found in the System Security Services Daemon (SSSD). The pam_passkey_child_read_data() function within the PAM passkey responder fails to properly handle raw bytes received from a pipe. Because the data is treated as a NUL-terminated C string without explicit termination, it results in an out-of-bounds read when processed by functions like snprintf(). A local attacker could potentially trigger this vulnerability by initiating a crafted passkey authentication request, causing the SSSD PAM responder to crash, resulting in a local Denial of Service (DoS). (CVE-2026-6245)

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 'dnf update sssd --releasever 2023.12.20260720' or or 'dnf update --advisory ALAS2023-2026-1984 --releasever 2023.12.20260720' to update your system.

Plugin Details

Severity: High

ID: 328460

File Name: al2023_ALAS2023-2026-1984.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Amazon Linux Local Security Checks

Published: 7/20/2026

Updated: 7/20/2026

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: 5

Percentile: 94.1

CVSS v2

Risk Factor: Medium

Base Score: 4.6

Temporal Score: 3.4

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

CVSS Score Source: CVE-2026-6245

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

CVSS Score Source: CVE-2026-14474

Vulnerability Information

CPE: cpe:/o:amazon:linux:2023, p-cpe:/a:amazon:linux:libipa_hbac-debuginfo, p-cpe:/a:amazon:linux:libipa_hbac-devel, p-cpe:/a:amazon:linux:libipa_hbac, p-cpe:/a:amazon:linux:libsss_autofs-debuginfo, p-cpe:/a:amazon:linux:libsss_autofs, p-cpe:/a:amazon:linux:libsss_certmap-debuginfo, p-cpe:/a:amazon:linux:libsss_certmap-devel, p-cpe:/a:amazon:linux:libsss_certmap, p-cpe:/a:amazon:linux:libsss_idmap-debuginfo, p-cpe:/a:amazon:linux:libsss_idmap-devel, p-cpe:/a:amazon:linux:libsss_idmap, p-cpe:/a:amazon:linux:libsss_nss_idmap-debuginfo, p-cpe:/a:amazon:linux:libsss_nss_idmap-devel, p-cpe:/a:amazon:linux:libsss_nss_idmap, p-cpe:/a:amazon:linux:libsss_simpleifp-debuginfo, p-cpe:/a:amazon:linux:libsss_simpleifp-devel, p-cpe:/a:amazon:linux:libsss_simpleifp, p-cpe:/a:amazon:linux:libsss_sudo-debuginfo, p-cpe:/a:amazon:linux:libsss_sudo, p-cpe:/a:amazon:linux:python3-libipa_hbac-debuginfo, p-cpe:/a:amazon:linux:python3-libipa_hbac, p-cpe:/a:amazon:linux:python3-libsss_nss_idmap-debuginfo, p-cpe:/a:amazon:linux:python3-libsss_nss_idmap, p-cpe:/a:amazon:linux:python3-sss-debuginfo, p-cpe:/a:amazon:linux:python3-sss-murmur-debuginfo, p-cpe:/a:amazon:linux:python3-sss-murmur, p-cpe:/a:amazon:linux:python3-sss, p-cpe:/a:amazon:linux:python3-sssdconfig, p-cpe:/a:amazon:linux:sssd-ad-debuginfo, p-cpe:/a:amazon:linux:sssd-ad, p-cpe:/a:amazon:linux:sssd-client-debuginfo, p-cpe:/a:amazon:linux:sssd-client, p-cpe:/a:amazon:linux:sssd-common-debuginfo, p-cpe:/a:amazon:linux:sssd-common-pac-debuginfo, p-cpe:/a:amazon:linux:sssd-common-pac, p-cpe:/a:amazon:linux:sssd-common, p-cpe:/a:amazon:linux:sssd-dbus-debuginfo, p-cpe:/a:amazon:linux:sssd-dbus, p-cpe:/a:amazon:linux:sssd-debuginfo, p-cpe:/a:amazon:linux:sssd-debugsource, p-cpe:/a:amazon:linux:sssd-idp-debuginfo, p-cpe:/a:amazon:linux:sssd-idp, p-cpe:/a:amazon:linux:sssd-ipa-debuginfo, p-cpe:/a:amazon:linux:sssd-ipa, p-cpe:/a:amazon:linux:sssd-kcm-debuginfo, p-cpe:/a:amazon:linux:sssd-kcm, p-cpe:/a:amazon:linux:sssd-krb5-common-debuginfo, p-cpe:/a:amazon:linux:sssd-krb5-common, p-cpe:/a:amazon:linux:sssd-krb5-debuginfo, p-cpe:/a:amazon:linux:sssd-krb5, p-cpe:/a:amazon:linux:sssd-ldap-debuginfo, p-cpe:/a:amazon:linux:sssd-ldap, p-cpe:/a:amazon:linux:sssd-nfs-idmap-debuginfo, p-cpe:/a:amazon:linux:sssd-nfs-idmap, p-cpe:/a:amazon:linux:sssd-proxy-debuginfo, p-cpe:/a:amazon:linux:sssd-proxy, p-cpe:/a:amazon:linux:sssd-tools-debuginfo, p-cpe:/a:amazon:linux:sssd-tools, p-cpe:/a:amazon:linux:sssd-winbind-idmap-debuginfo, 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: 7/20/2026

Vulnerability Publication Date: 4/15/2026

Reference Information

CVE: CVE-2026-12610, CVE-2026-14474, CVE-2026-14476, CVE-2026-6245

Detections

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