Amazon Linux 2 Security Advisory: ALAS2-2026-3877
Advisory Released Date: 2026-08-25
Advisory Updated Date: 2026-08-25
A flaw was found in FreeIPA. When a trust relationship is configured between FreeIPA and Active Directory, Active Directory users can bypass authentication for FreeIPA services, including the portal, SMB server, and LDAP directory. This is possible by impersonating a client name in the Ticket Granting Service (TGS) due to FreeIPA services not verifying Privilege Attribute Certificate (PAC) certificates. This vulnerability could allow an authenticated Active Directory user to escalate their privileges within the FreeIPA domain. (CVE-2026-11861)
A privilege escalation flaw was found in FreeIPA. The uniqueness constraint enforced on Kerberos principal name attributes in the 389-ds directory server does not properly account for equivalent representations of the same principal name, allowing a user with sufficient LDAP write privileges to create a service principal that impersonates an existing privileged one. This can lead to unauthorized acquisition of Kerberos service tickets for sensitive services, potentially resulting in full domain compromise. (CVE-2026-13097)
Affected Packages:
ipa
Note:
This advisory is applicable to Amazon Linux 2 (AL2) Core repository. Visit this FAQ section for the difference between AL2 Core and AL2 Extras advisories.
Issue Correction:
Run yum update ipa or yum update --advisory ALAS2-2026-3877 to update your system.
aarch64:
ipa-server-4.6.8-5.amzn2.17.5.aarch64
ipa-server-trust-ad-4.6.8-5.amzn2.17.5.aarch64
ipa-client-4.6.8-5.amzn2.17.5.aarch64
ipa-debuginfo-4.6.8-5.amzn2.17.5.aarch64
i686:
ipa-server-4.6.8-5.amzn2.17.5.i686
ipa-server-trust-ad-4.6.8-5.amzn2.17.5.i686
ipa-client-4.6.8-5.amzn2.17.5.i686
ipa-debuginfo-4.6.8-5.amzn2.17.5.i686
noarch:
python2-ipaserver-4.6.8-5.amzn2.17.5.noarch
ipa-server-common-4.6.8-5.amzn2.17.5.noarch
ipa-server-dns-4.6.8-5.amzn2.17.5.noarch
python2-ipaclient-4.6.8-5.amzn2.17.5.noarch
ipa-client-common-4.6.8-5.amzn2.17.5.noarch
ipa-python-compat-4.6.8-5.amzn2.17.5.noarch
python2-ipalib-4.6.8-5.amzn2.17.5.noarch
ipa-common-4.6.8-5.amzn2.17.5.noarch
src:
ipa-4.6.8-5.amzn2.17.5.src
x86_64:
ipa-server-4.6.8-5.amzn2.17.5.x86_64
ipa-server-trust-ad-4.6.8-5.amzn2.17.5.x86_64
ipa-client-4.6.8-5.amzn2.17.5.x86_64
ipa-debuginfo-4.6.8-5.amzn2.17.5.x86_64