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Bug
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Resolution: Done-Errata
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Critical
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rhel-7.9.z
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krb5-1.15.1-55.el7_9.3
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Yes
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Important
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ZStream
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sst_idm_ipa
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ssg_idm
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8
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False
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None
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None
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Approved Blocker
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Pass
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Automated
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None
The latest investigations indicate that this problem is caused by the generalization of the Message-Authenticator attribute to sign RADIUS access requests and responses which is part of the mitigation of the BlastRADIUS vulnerability (CVE-2024-3596).
The mitigation of this vulnerability is part of a larger plan to fix various weaknesses in the RADIUS protocol: draft-ietf-radext-deprecating-radius-03.
MIT krb5 includes a partial implementation of RADIUS protocol (RFC2865), but has no support for Message-Authenticator. This causes all RADIUS request from the KDC to the RADIUS server to be rejected, which breaks passwordless setups.
Support for Message-Authenticator has to be implemented in MIT krb5's libkrad to allow the KDC to generate valid access requests.
Combination of radiusd and ipa-otpd logs:
(0) # Executing section post-auth from file /etc/raddb/sites-enabled/default
(0) post-auth {
(0) if (session-state:User-Name && reply:User-Name && request:User-Name && (reply:User-Name == request:User-Name)) {
(0) if (session-state:User-Name && reply:User-Name && request:User-Name && (reply:User-Name == request:User-Name)) -> FALSE
(0) update {
(0) No attributes updated for RHS &session-state:
(0) } # update = noop
(0) [exec] = noop
(0) policy remove_reply_message_if_eap {
(0) if (&reply:EAP-Message && &reply:Reply-Message) {
(0) if (&reply:EAP-Message && &reply:Reply-Message) -> FALSE
(0) else {
(0) [noop] = noop
(0) } # else = noop
(0) } # policy remove_reply_message_if_eap = noop
(0) } # post-auth = noop
(0) Sent Access-Accept Id 13 from 127.0.0.1:1812 to 127.0.0.1:44619 length 0
(0) Finished request
Waking up in 4.9 seconds.
Jul 23 10:40:36 master.test.ipa ipa-otpd[20230]: tuser@TEST.IPA: request received
Jul 23 10:40:36 master.test.ipa ipa-otpd[20230]: tuser@TEST.IPA: user query start
Jul 23 10:40:36 master.test.ipa ipa-otpd[20230]: tuser@TEST.IPA: user query end: uid=tuser,cn=users,cn=accounts,dc=test,dc=ipa
Jul 23 10:40:36 master.test.ipa ipa-otpd[20230]: tuser@TEST.IPA: radius query start: cn=tproxy,cn=radiusproxy,dc=test,dc=ipa
Jul 23 10:40:36 master.test.ipa ipa-otpd[20230]: tuser@TEST.IPA: radius query end: 127.0.0.1
Jul 23 10:40:36 master.test.ipa ipa-otpd[20230]: tuser@TEST.IPA: forward start: tuser / 127.0.0.1
(0) Sending duplicate reply to client localhost port 44619 - ID: 13
Waking up in 6.2 seconds.
(0) Sending duplicate reply to client localhost port 44619 - ID: 13
Waking up in 12.4 seconds.
(0) Sending duplicate reply to client localhost port 44619 - ID: 13
Waking up in 28.7 seconds.
kinit: Preauthentication failed while getting initial credentials
Jul 23 10:40:51 master.test.ipa ipa-otpd[20230]: tuser@TEST.IPA: forward end: Connection timed out
Jul 23 10:40:51 master.test.ipa ipa-otpd[20230]: tuser@TEST.IPA: sent: 0 data: 20
Jul 23 10:40:51 master.test.ipa ipa-otpd[20230]: tuser@TEST.IPA: ..sent: 20 data: 20
Jul 23 10:40:51 master.test.ipa ipa-otpd[20230]: tuser@TEST.IPA: response sent: Access-Reject
- clones
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- Closed
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- links to
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RHSA-2024:140917
krb5 security update