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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2021.3976 krb5 security update 24 November 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: krb5 Publisher: Red Hat Operating System: Red Hat Impact/Access: Denial of Service -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2021-37750 Reference: ESB-2021.3941 ESB-2021.3878 ESB-2021.3649 ESB-2021.3499 Original Bulletin: https://access.redhat.com/errata/RHSA-2021:4788 - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 ===================================================================== Red Hat Security Advisory Synopsis: Moderate: krb5 security update Advisory ID: RHSA-2021:4788-01 Product: Red Hat Enterprise Linux Advisory URL: https://access.redhat.com/errata/RHSA-2021:4788 Issue date: 2021-11-23 CVE Names: CVE-2021-37750 ===================================================================== 1. Summary: An update for krb5 is now available for Red Hat Enterprise Linux 7. 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 Client (v. 7) - x86_64 Red Hat Enterprise Linux Client Optional (v. 7) - x86_64 Red Hat Enterprise Linux ComputeNode (v. 7) - x86_64 Red Hat Enterprise Linux ComputeNode Optional (v. 7) - x86_64 Red Hat Enterprise Linux Server (v. 7) - ppc64, ppc64le, s390x, x86_64 Red Hat Enterprise Linux Workstation (v. 7) - 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: 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/): 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 Client (v. 7): Source: krb5-1.15.1-51.el7_9.src.rpm x86_64: krb5-debuginfo-1.15.1-51.el7_9.i686.rpm krb5-debuginfo-1.15.1-51.el7_9.x86_64.rpm krb5-libs-1.15.1-51.el7_9.i686.rpm krb5-libs-1.15.1-51.el7_9.x86_64.rpm krb5-pkinit-1.15.1-51.el7_9.x86_64.rpm krb5-workstation-1.15.1-51.el7_9.x86_64.rpm libkadm5-1.15.1-51.el7_9.i686.rpm libkadm5-1.15.1-51.el7_9.x86_64.rpm Red Hat Enterprise Linux Client Optional (v. 7): x86_64: krb5-debuginfo-1.15.1-51.el7_9.i686.rpm krb5-debuginfo-1.15.1-51.el7_9.x86_64.rpm krb5-devel-1.15.1-51.el7_9.i686.rpm krb5-devel-1.15.1-51.el7_9.x86_64.rpm krb5-server-1.15.1-51.el7_9.x86_64.rpm krb5-server-ldap-1.15.1-51.el7_9.x86_64.rpm Red Hat Enterprise Linux ComputeNode (v. 7): Source: krb5-1.15.1-51.el7_9.src.rpm x86_64: krb5-debuginfo-1.15.1-51.el7_9.i686.rpm krb5-debuginfo-1.15.1-51.el7_9.x86_64.rpm krb5-libs-1.15.1-51.el7_9.i686.rpm krb5-libs-1.15.1-51.el7_9.x86_64.rpm krb5-pkinit-1.15.1-51.el7_9.x86_64.rpm krb5-workstation-1.15.1-51.el7_9.x86_64.rpm libkadm5-1.15.1-51.el7_9.i686.rpm libkadm5-1.15.1-51.el7_9.x86_64.rpm Red Hat Enterprise Linux ComputeNode Optional (v. 7): x86_64: krb5-debuginfo-1.15.1-51.el7_9.i686.rpm krb5-debuginfo-1.15.1-51.el7_9.x86_64.rpm krb5-devel-1.15.1-51.el7_9.i686.rpm krb5-devel-1.15.1-51.el7_9.x86_64.rpm krb5-server-1.15.1-51.el7_9.x86_64.rpm krb5-server-ldap-1.15.1-51.el7_9.x86_64.rpm Red Hat Enterprise Linux Server (v. 7): Source: krb5-1.15.1-51.el7_9.src.rpm ppc64: krb5-debuginfo-1.15.1-51.el7_9.ppc.rpm krb5-debuginfo-1.15.1-51.el7_9.ppc64.rpm krb5-devel-1.15.1-51.el7_9.ppc.rpm krb5-devel-1.15.1-51.el7_9.ppc64.rpm krb5-libs-1.15.1-51.el7_9.ppc.rpm krb5-libs-1.15.1-51.el7_9.ppc64.rpm krb5-pkinit-1.15.1-51.el7_9.ppc64.rpm krb5-server-1.15.1-51.el7_9.ppc64.rpm krb5-server-ldap-1.15.1-51.el7_9.ppc64.rpm krb5-workstation-1.15.1-51.el7_9.ppc64.rpm libkadm5-1.15.1-51.el7_9.ppc.rpm libkadm5-1.15.1-51.el7_9.ppc64.rpm ppc64le: krb5-debuginfo-1.15.1-51.el7_9.ppc64le.rpm krb5-devel-1.15.1-51.el7_9.ppc64le.rpm krb5-libs-1.15.1-51.el7_9.ppc64le.rpm krb5-pkinit-1.15.1-51.el7_9.ppc64le.rpm krb5-server-1.15.1-51.el7_9.ppc64le.rpm krb5-server-ldap-1.15.1-51.el7_9.ppc64le.rpm krb5-workstation-1.15.1-51.el7_9.ppc64le.rpm libkadm5-1.15.1-51.el7_9.ppc64le.rpm s390x: krb5-debuginfo-1.15.1-51.el7_9.s390.rpm krb5-debuginfo-1.15.1-51.el7_9.s390x.rpm krb5-devel-1.15.1-51.el7_9.s390.rpm krb5-devel-1.15.1-51.el7_9.s390x.rpm krb5-libs-1.15.1-51.el7_9.s390.rpm krb5-libs-1.15.1-51.el7_9.s390x.rpm krb5-pkinit-1.15.1-51.el7_9.s390x.rpm krb5-server-1.15.1-51.el7_9.s390x.rpm krb5-server-ldap-1.15.1-51.el7_9.s390x.rpm krb5-workstation-1.15.1-51.el7_9.s390x.rpm libkadm5-1.15.1-51.el7_9.s390.rpm libkadm5-1.15.1-51.el7_9.s390x.rpm x86_64: krb5-debuginfo-1.15.1-51.el7_9.i686.rpm krb5-debuginfo-1.15.1-51.el7_9.x86_64.rpm krb5-devel-1.15.1-51.el7_9.i686.rpm krb5-devel-1.15.1-51.el7_9.x86_64.rpm krb5-libs-1.15.1-51.el7_9.i686.rpm krb5-libs-1.15.1-51.el7_9.x86_64.rpm krb5-pkinit-1.15.1-51.el7_9.x86_64.rpm krb5-server-1.15.1-51.el7_9.x86_64.rpm krb5-server-ldap-1.15.1-51.el7_9.x86_64.rpm krb5-workstation-1.15.1-51.el7_9.x86_64.rpm libkadm5-1.15.1-51.el7_9.i686.rpm libkadm5-1.15.1-51.el7_9.x86_64.rpm Red Hat Enterprise Linux Workstation (v. 7): Source: krb5-1.15.1-51.el7_9.src.rpm x86_64: krb5-debuginfo-1.15.1-51.el7_9.i686.rpm krb5-debuginfo-1.15.1-51.el7_9.x86_64.rpm krb5-devel-1.15.1-51.el7_9.i686.rpm krb5-devel-1.15.1-51.el7_9.x86_64.rpm krb5-libs-1.15.1-51.el7_9.i686.rpm krb5-libs-1.15.1-51.el7_9.x86_64.rpm krb5-pkinit-1.15.1-51.el7_9.x86_64.rpm krb5-server-1.15.1-51.el7_9.x86_64.rpm krb5-server-ldap-1.15.1-51.el7_9.x86_64.rpm krb5-workstation-1.15.1-51.el7_9.x86_64.rpm libkadm5-1.15.1-51.el7_9.i686.rpm libkadm5-1.15.1-51.el7_9.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-2021-37750 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 iQIVAwUBYZ1SHdzjgjWX9erEAQgtHw/+MZpwUjB3YzP7LmDSYqwmIGQLWS6i1q4+ V2WpqE7qZwDm40SAGSOR3shH5Y7KAmAFJ6+oLTk1SGllVqI/P+H5vVd0S8A87Hrj oOJpD+wxu2Sj2IxFtMzzV8hmAk+VOKIP/dy7AAZ5u9gRc6b1V2FQ5lGz787ccwO1 8uXV2nog4doJe8ro+Hd3sk5OYDNqTEY+77Sl+mUgN7caOgXNFFmeZmEkrUwwL5st 3sF+HjT7c4HGSLjH1JU2fmdFtwGacODim7tnfXgRDwpKK6tqmVVfNjLOn6t0qR2k EwNWOZNgLpQ2uNq/DVQxl8TsNkQWHu7jO6zmoFMnWR04Mm48XTfN2N/cDK4iLQXw a5iiYTPesqxm618lqS8brvk42/X+ekKvyHuWwYmYZUMkLdp7NvhKwHDHVJQsm39c fE0xJWs8KENhpkcmsvwbLyXHXpnBBR/zLHkPf2ugXujZqVo3LBIP3jrQ5ZGTnZam k/cbh3mctvcDNHmwez0xRQBC286LW5JARqarFzV5ebr1qn6NHcTRjRE4eO0Zv+lE F/F6BpX/kvD/6gMcc99s0XRh5cLQs7Zo/qcLgqFrk2qPURusdAESxNxfO/0U9MLe XmHsHj4tq8sujN4sNyG2cvAj7iUiVxCTegz+OzTtupH/hlbQ08xigrxMVN8x8ffy 1+fffAUf0yM= =9EfJ - -----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 iQIVAwUBYZ19R+NLKJtyKPYoAQiiIA/9EV+YQfOmCTpQvTfUYijhW1eTCN9obK12 TI0jucg1doiDR5CRfJbleEDgWosJ7m2OZjGnEqouI+IloVjbhp8sRdOGzvFsdNaZ Snn1KpaU5e+vuboOORBGZkYykGrQ0U+KRKFKfMQLaD/UFuv56DMnjU4H1t/bDmUH ZlLHpcULwUQzwX1gXRQZ61NxQhtMHmjlrmy6FRbEhtm4BSI2f14cnACMSCFm5lhx 8VY9UlapCmzmDwhSqTwzCTqNBFGBmcHQpOtscEUlqgCxoYuNM2AzD260ZI34hQ6r 8LFGUrbKu7IfumvWsq7OHWZKCDTMen6RKGc9FIQkUiLVKgjQQzbvxsevYW7SKham HazxSKTUmFyiRk/rlba0RcImXbIvPMDcrpxgZrFbm20qTZjw2T09Ja0FItz+V03X eX67/q0/UO66Owfhtlp01cBhnC/jU5RYgO3BzMO/ALNsVEuOeQ6pdSdO27tZRqlJ 9y2r4IoM1BVhSApLqxQcxbO3D4DcbVuwb3Ea2iE1xeWQSQkiyZ1XAoRl7IKHbuxI nczFC8qbuqD2gFAM+RrJuodfKwNqG3NUj6vtGAkI/FMe8rLR20VvF0A5ie/G8M4C CuSTsKm+2Lt7gVGIuppeLZhp5Jk8Qg0kSBDOEwbkvnhBwI8bayiZQTJ317Ld1RfO uTPvHEg4wow= =O7bM -----END PGP SIGNATURE-----