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Ubuntu 23.04: USN-6467-2 Urgent: Critical Kerberos DoS Vulnerability

ubuntu
Calendar Grey November 6, 2023
Dist Ubuntu Esm H88
Vulnerabilities in Kerberos might allow for a crash due to rogue network packets. Ensure your Ubuntu systems are patched to bolster security.
Kerberos could be made to crash if it received specially crafted network traffic.

Summary

Kerberos could be made to crash if it received specially crafted

network traffic.

Software Description:

- krb5: MIT Kerberos Network Authentication Protocol

Details:

USN-6467-1 fixed a vulnerability in Kerberos. This update provides the

corresponding update for Ubuntu 20.04 LTS, Ubuntu 22.04 LTS and Ubuntu

23.04.

Original advisory details:

Robert Morris discovered that Kerberos did not properly handle memory

access when processing RPC data through kadmind, which could lead to the

freeing of uninitialized memory. An authenticated remote attacker could

possibly use this issue to cause kadmind to crash, resulting in a denial

of service.

Topics%20covered

Topics Covered

security advisory denial of service critical risk Ubuntu krb5 network crash

Update Instructions

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 23.04:
krb5-admin-server 1.20.1-1ubuntu0.1
krb5-kdc 1.20.1-1ubuntu0.1
krb5-kdc-ldap 1.20.1-1ubuntu0.1
krb5-otp 1.20.1-1ubuntu0.1
krb5-pkinit 1.20.1-1ubuntu0.1
krb5-user 1.20.1-1ubuntu0.1
libgssapi-krb5-2 1.20.1-1ubuntu0.1
libgssrpc4 1.20.1-1ubuntu0.1
libk5crypto3 1.20.1-1ubuntu0.1
libkadm5clnt-mit12 1.20.1-1ubuntu0.1
libkadm5srv-mit12 1.20.1-1ubuntu0.1
libkdb5-10 1.20.1-1ubuntu0.1
libkrad0 1.20.1-1ubuntu0.1
libkrb5-3 1.20.1-1ubuntu0.1
libkrb5support0 1.20.1-1ubuntu0.1

Ubuntu 22.04 LTS:
krb5-admin-server 1.19.2-2ubuntu0.3
krb5-kdc 1.19.2-2ubuntu0.3
krb5-kdc-ldap 1.19.2-2ubuntu0.3
krb5-otp 1.19.2-2ubuntu0.3
krb5-pkinit 1.19.2-2ubuntu0.3
krb5-user 1.19.2-2ubuntu0.3
libgssapi-krb5-2 1.19.2-2ubuntu0.3
libgssrpc4 1.19.2-2ubuntu0.3
libk5crypto3 1.19.2-2ubuntu0.3
libkadm5clnt-mit12 1.19.2-2ubuntu0.3
libkadm5srv-mit12 1.19.2-2ubuntu0.3
libkdb5-10 1.19.2-2ubuntu0.3
libkrad0 1.19.2-2ubuntu0.3
libkrb5-3 1.19.2-2ubuntu0.3
libkrb5support0 1.19.2-2ubuntu0.3

Ubuntu 20.04 LTS:
krb5-admin-server 1.17-6ubuntu4.4
krb5-kdc 1.17-6ubuntu4.4
krb5-kdc-ldap 1.17-6ubuntu4.4
krb5-otp 1.17-6ubuntu4.4
krb5-pkinit 1.17-6ubuntu4.4
krb5-user 1.17-6ubuntu4.4
libgssapi-krb5-2 1.17-6ubuntu4.4
libgssrpc4 1.17-6ubuntu4.4
libk5crypto3 1.17-6ubuntu4.4
libkadm5clnt-mit11 1.17-6ubuntu4.4
libkadm5srv-mit11 1.17-6ubuntu4.4
libkdb5-9 1.17-6ubuntu4.4
libkrad0 1.17-6ubuntu4.4
libkrb5-3 1.17-6ubuntu4.4
libkrb5support0 1.17-6ubuntu4.4

In general, a standard system update will make all the necessary changes.

References

https://ubuntu.com/security/notices/USN-6467-2

https://ubuntu.com/security/notices/USN-6467-1

CVE-2023-36054

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-6467-2

Topics%20covered

Topics Covered

security advisory denial of service critical risk Ubuntu krb5 network crash

Package Information

https://launchpad.net/ubuntu/+source/krb5/1.19.2-2ubuntu0.3
https://launchpad.net/ubuntu/+source/krb5/1.17-6ubuntu4.4

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