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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2021.3166 krb5 security update 22 September 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: krb5 Publisher: Red Hat Operating System: Red Hat Impact/Access: Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2021-37750 CVE-2021-36222 Reference: ESB-2021.2831 ESB-2021.2522 Original Bulletin: https://access.redhat.com/errata/RHSA-2021:3576 - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 ===================================================================== Red Hat Security Advisory Synopsis: Moderate: krb5 security update Advisory ID: RHSA-2021:3576-01 Product: Red Hat Enterprise Linux Advisory URL: https://access.redhat.com/errata/RHSA-2021:3576 Issue date: 2021-09-21 CVE Names: CVE-2021-36222 CVE-2021-37750 ===================================================================== 1. Summary: An update for krb5 is now available for Red Hat Enterprise Linux 8. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section. 2. Relevant releases/architectures: Red Hat Enterprise Linux BaseOS (v. 8) - aarch64, ppc64le, s390x, x86_64 3. Description: Kerberos is a network authentication system, which can improve the security of your network by eliminating the insecure practice of sending passwords over the network in unencrypted form. It allows clients and servers to authenticate to each other with the help of a trusted third party, the Kerberos key distribution center (KDC). Security Fix(es): * krb5: Sending a request containing PA-ENCRYPTED-CHALLENGE padata element without using FAST could result in NULL dereference in KDC which leads to DoS (CVE-2021-36222) * krb5: NULL pointer dereference in process_tgs_req() in kdc/do_tgs_req.c via a FAST inner body that lacks server field (CVE-2021-37750) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section. 4. Solution: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing the updated packages, running Kerberos services (krb5kdc, kadmin, and kprop) will be restarted automatically. 5. Bugs fixed (https://bugzilla.redhat.com/): 1983720 - CVE-2021-36222 krb5: Sending a request containing PA-ENCRYPTED-CHALLENGE padata element without using FAST could result in NULL dereference in KDC which leads to DoS 1996834 - CVE-2021-37750 krb5: NULL pointer dereference in process_tgs_req() in kdc/do_tgs_req.c via a FAST inner body that lacks server field 6. Package List: Red Hat Enterprise Linux BaseOS (v. 8): Source: krb5-1.18.2-8.3.el8_4.src.rpm aarch64: krb5-debuginfo-1.18.2-8.3.el8_4.aarch64.rpm krb5-debugsource-1.18.2-8.3.el8_4.aarch64.rpm krb5-devel-1.18.2-8.3.el8_4.aarch64.rpm krb5-devel-debuginfo-1.18.2-8.3.el8_4.aarch64.rpm krb5-libs-1.18.2-8.3.el8_4.aarch64.rpm krb5-libs-debuginfo-1.18.2-8.3.el8_4.aarch64.rpm krb5-pkinit-1.18.2-8.3.el8_4.aarch64.rpm krb5-pkinit-debuginfo-1.18.2-8.3.el8_4.aarch64.rpm krb5-server-1.18.2-8.3.el8_4.aarch64.rpm krb5-server-debuginfo-1.18.2-8.3.el8_4.aarch64.rpm krb5-server-ldap-1.18.2-8.3.el8_4.aarch64.rpm krb5-server-ldap-debuginfo-1.18.2-8.3.el8_4.aarch64.rpm krb5-workstation-1.18.2-8.3.el8_4.aarch64.rpm krb5-workstation-debuginfo-1.18.2-8.3.el8_4.aarch64.rpm libkadm5-1.18.2-8.3.el8_4.aarch64.rpm libkadm5-debuginfo-1.18.2-8.3.el8_4.aarch64.rpm ppc64le: krb5-debuginfo-1.18.2-8.3.el8_4.ppc64le.rpm krb5-debugsource-1.18.2-8.3.el8_4.ppc64le.rpm krb5-devel-1.18.2-8.3.el8_4.ppc64le.rpm krb5-devel-debuginfo-1.18.2-8.3.el8_4.ppc64le.rpm krb5-libs-1.18.2-8.3.el8_4.ppc64le.rpm krb5-libs-debuginfo-1.18.2-8.3.el8_4.ppc64le.rpm krb5-pkinit-1.18.2-8.3.el8_4.ppc64le.rpm krb5-pkinit-debuginfo-1.18.2-8.3.el8_4.ppc64le.rpm krb5-server-1.18.2-8.3.el8_4.ppc64le.rpm krb5-server-debuginfo-1.18.2-8.3.el8_4.ppc64le.rpm krb5-server-ldap-1.18.2-8.3.el8_4.ppc64le.rpm krb5-server-ldap-debuginfo-1.18.2-8.3.el8_4.ppc64le.rpm krb5-workstation-1.18.2-8.3.el8_4.ppc64le.rpm krb5-workstation-debuginfo-1.18.2-8.3.el8_4.ppc64le.rpm libkadm5-1.18.2-8.3.el8_4.ppc64le.rpm libkadm5-debuginfo-1.18.2-8.3.el8_4.ppc64le.rpm s390x: krb5-debuginfo-1.18.2-8.3.el8_4.s390x.rpm krb5-debugsource-1.18.2-8.3.el8_4.s390x.rpm krb5-devel-1.18.2-8.3.el8_4.s390x.rpm krb5-devel-debuginfo-1.18.2-8.3.el8_4.s390x.rpm krb5-libs-1.18.2-8.3.el8_4.s390x.rpm krb5-libs-debuginfo-1.18.2-8.3.el8_4.s390x.rpm krb5-pkinit-1.18.2-8.3.el8_4.s390x.rpm krb5-pkinit-debuginfo-1.18.2-8.3.el8_4.s390x.rpm krb5-server-1.18.2-8.3.el8_4.s390x.rpm krb5-server-debuginfo-1.18.2-8.3.el8_4.s390x.rpm krb5-server-ldap-1.18.2-8.3.el8_4.s390x.rpm krb5-server-ldap-debuginfo-1.18.2-8.3.el8_4.s390x.rpm krb5-workstation-1.18.2-8.3.el8_4.s390x.rpm krb5-workstation-debuginfo-1.18.2-8.3.el8_4.s390x.rpm libkadm5-1.18.2-8.3.el8_4.s390x.rpm libkadm5-debuginfo-1.18.2-8.3.el8_4.s390x.rpm x86_64: krb5-debuginfo-1.18.2-8.3.el8_4.i686.rpm krb5-debuginfo-1.18.2-8.3.el8_4.x86_64.rpm krb5-debugsource-1.18.2-8.3.el8_4.i686.rpm krb5-debugsource-1.18.2-8.3.el8_4.x86_64.rpm krb5-devel-1.18.2-8.3.el8_4.i686.rpm krb5-devel-1.18.2-8.3.el8_4.x86_64.rpm krb5-devel-debuginfo-1.18.2-8.3.el8_4.i686.rpm krb5-devel-debuginfo-1.18.2-8.3.el8_4.x86_64.rpm krb5-libs-1.18.2-8.3.el8_4.i686.rpm krb5-libs-1.18.2-8.3.el8_4.x86_64.rpm krb5-libs-debuginfo-1.18.2-8.3.el8_4.i686.rpm krb5-libs-debuginfo-1.18.2-8.3.el8_4.x86_64.rpm krb5-pkinit-1.18.2-8.3.el8_4.i686.rpm krb5-pkinit-1.18.2-8.3.el8_4.x86_64.rpm krb5-pkinit-debuginfo-1.18.2-8.3.el8_4.i686.rpm krb5-pkinit-debuginfo-1.18.2-8.3.el8_4.x86_64.rpm krb5-server-1.18.2-8.3.el8_4.i686.rpm krb5-server-1.18.2-8.3.el8_4.x86_64.rpm krb5-server-debuginfo-1.18.2-8.3.el8_4.i686.rpm krb5-server-debuginfo-1.18.2-8.3.el8_4.x86_64.rpm krb5-server-ldap-1.18.2-8.3.el8_4.i686.rpm krb5-server-ldap-1.18.2-8.3.el8_4.x86_64.rpm krb5-server-ldap-debuginfo-1.18.2-8.3.el8_4.i686.rpm krb5-server-ldap-debuginfo-1.18.2-8.3.el8_4.x86_64.rpm krb5-workstation-1.18.2-8.3.el8_4.x86_64.rpm krb5-workstation-debuginfo-1.18.2-8.3.el8_4.i686.rpm krb5-workstation-debuginfo-1.18.2-8.3.el8_4.x86_64.rpm libkadm5-1.18.2-8.3.el8_4.i686.rpm libkadm5-1.18.2-8.3.el8_4.x86_64.rpm libkadm5-debuginfo-1.18.2-8.3.el8_4.i686.rpm libkadm5-debuginfo-1.18.2-8.3.el8_4.x86_64.rpm These packages are GPG signed by Red Hat for security. Our key and details on how to verify the signature are available from https://access.redhat.com/security/team/key/ 7. References: https://access.redhat.com/security/cve/CVE-2021-36222 https://access.redhat.com/security/cve/CVE-2021-37750 https://access.redhat.com/security/updates/classification/#moderate 8. Contact: The Red Hat security contact is <secalert@redhat.com>. More contact details at https://access.redhat.com/security/team/contact/ Copyright 2021 Red Hat, Inc. - -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIVAwUBYUmbj9zjgjWX9erEAQg2Kw/+NRDE0OE48Hl3Z6Yc/mfRlHNBj0/xf7nT OjY8RogZ6u3U8KTBjJTm0wQD9kSmUy8bezClSw/kjScb3HvzeekrBxjddas7KjU9 W/UNwsFJu00voT0gHr44JveHAga0iUJIY09zYAQ4IxXX/Wy9FwGY5/kCyM5vAYbo qpCBCwyZzOH3YpxJKEcRFXT9z1EGAidv17wlhYQJxtVvzRi2cfVbL9rtjINNNgfy Fg0yJb7FncZont44rpFv6voAQKw38SV8YFPrEf379YdNzXKpj35IzVted6LBDgF9 AuwDKoq29c66EWqneFGWAo70UZDfOUNWpjYFR8k6YW1cTOROGyDrKiV1Bm++RsAu juRYbmp1nGZQzvJ+sSTyn9NokwEBVM4ZrcT4Vb7r5+URPSwzcvMe4MihPuO+y+5O nNYPjo2e328IHYR11bXErv+kWJ/Mnbt4ye7j61/vJlikmL/kRpQANxAD1XXi6U9k 5KxgrVKonJCpqrvoPQx3c5ZKnk8Tfich/WJBVBxkljjAoIJYZ4FoeksdSaxOeUAg R/3YS+fgmCPyiNgGCmkmp6n+hVoPgAKtYUYn8/PUpuyY3zJx1nhTh9L6tfuruB3s OS8/aDHPb/nQje/sQRXlcuMtuFwGK4avRtOTEp8JxiOhWFM6Q+m10NunslG6vLOQ n4/SIvvFdqU= =jR26 - -----END PGP SIGNATURE----- - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. 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On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBYUqM++NLKJtyKPYoAQiR8A/9Ewe6AgGLuyi/zO70Xh3EhYm/NE1OUPVh CZwwhX26ZvEr6pLQuPtmkl6b5brGmFXj8ZZFxCE7wzvR5sv0Co5o8V8idmoDNfZs J4IS0L9dqPbNNC6iluON5RCPrfN5P9uulbofsSKy49qQ5ysIOLydLlQaGxMUWa55 jngyLC/euBVVZVSiVGSxtV5mQxXGAdFXc8VDgaoORHm2LjwHlK2ce4+9cpegy8XD PYtNsWjvFYTVtWNtf041oD6ajvKzY346jYFxaZ2eKuzYx/p6oN7EXNBgghAeeYzJ gkirOu7pf/QWr1v2HrcI6az1kbbOeVpVWtAY30HN4mtBjut9UGx5EtDLWoXpPnCr JkiFJRm3uK/Jm50vICrZ3ulh5SGYp84KTffJg7DJefUja8lHU6NjGPK/CE3Dg3Nu bEdhTGvZhULbO51Qv89CMcXjYSUs62+ZfxaQdSN1y+Equ+rqUpjd0mwuWdU/bC4M fP8+USutM+lSkzkzhma2o7R6OvMkhj1WsGo9eUWPHkDn+vUPTxPcsvYSnApC+sq7 AGVYd0Pp99SvdFQS45mcbYwUQuVf7bM7Gnv/n1Ca3ZWM8gIwzxFeirye3sBxyqVG PPp8UdvxUGqlfkDPiwSl5jwBdTD5pOFuWes7pEtKebK2QWCRtP2Z/Ru0KxW/06lr 600jNhuy2SU= =qekM -----END PGP SIGNATURE-----