Medium: krb5

Issue Overview:

lib/kadm5/kadm_rpc_xdr.c in MIT Kerberos 5 (aka krb5) before 1.20.2 and 1.21.x before 1.21.1 frees an uninitialized pointer. A remote authenticated user can trigger a kadmind crash. This occurs because _xdr_kadm5_principal_ent_rec does not validate the relationship between n_key_data and the key_data array count. (CVE-2023-36054)

Affected Packages:

krb5

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 krb5 to update your system.

New Packages:

aarch64:  
    krb5-devel-1.15.1-55.amzn2.2.6.aarch64  
    krb5-libs-1.15.1-55.amzn2.2.6.aarch64  
    krb5-server-1.15.1-55.amzn2.2.6.aarch64  
    krb5-server-ldap-1.15.1-55.amzn2.2.6.aarch64  
    krb5-workstation-1.15.1-55.amzn2.2.6.aarch64  
    krb5-pkinit-1.15.1-55.amzn2.2.6.aarch64  
    libkadm5-1.15.1-55.amzn2.2.6.aarch64  
    krb5-debuginfo-1.15.1-55.amzn2.2.6.aarch64  
  
i686:  
    krb5-devel-1.15.1-55.amzn2.2.6.i686  
    krb5-libs-1.15.1-55.amzn2.2.6.i686  
    krb5-server-1.15.1-55.amzn2.2.6.i686  
    krb5-server-ldap-1.15.1-55.amzn2.2.6.i686  
    krb5-workstation-1.15.1-55.amzn2.2.6.i686  
    krb5-pkinit-1.15.1-55.amzn2.2.6.i686  
    libkadm5-1.15.1-55.amzn2.2.6.i686  
    krb5-debuginfo-1.15.1-55.amzn2.2.6.i686  
  
src:  
    krb5-1.15.1-55.amzn2.2.6.src  
  
x86_64:  
    krb5-devel-1.15.1-55.amzn2.2.6.x86_64  
    krb5-libs-1.15.1-55.amzn2.2.6.x86_64  
    krb5-server-1.15.1-55.amzn2.2.6.x86_64  
    krb5-server-ldap-1.15.1-55.amzn2.2.6.x86_64  
    krb5-workstation-1.15.1-55.amzn2.2.6.x86_64  
    krb5-pkinit-1.15.1-55.amzn2.2.6.x86_64  
    libkadm5-1.15.1-55.amzn2.2.6.x86_64  
    krb5-debuginfo-1.15.1-55.amzn2.2.6.x86_64  

Additional References

Red Hat: CVE-2023-36054

Mitre: CVE-2023-36054