Medium: krb5

Issue Overview:

A flaw was found in the OTP kdcpreauth module of MIT Kerberos. A remote attacker could use this flaw to bypass the requires_preauth flag on a client principal and obtain a ciphertext encrypted in the principal’s long-term key. This ciphertext could be used to conduct an off-line dictionary attack against the user’s password.

It was found that the krb5_read_message() function of MIT Kerberos did not correctly sanitize input, and could create invalid krb5_data objects. A remote, unauthenticated attacker could use this flaw to crash a Kerberos child process via a specially crafted request.

Affected Packages:

krb5

Issue Correction:
Run yum update krb5 to update your system.

New Packages:

i686:  
    krb5-server-1.13.2-10.39.amzn1.i686  
    krb5-libs-1.13.2-10.39.amzn1.i686  
    krb5-debuginfo-1.13.2-10.39.amzn1.i686  
    krb5-workstation-1.13.2-10.39.amzn1.i686  
    krb5-server-ldap-1.13.2-10.39.amzn1.i686  
    krb5-devel-1.13.2-10.39.amzn1.i686  
    krb5-pkinit-openssl-1.13.2-10.39.amzn1.i686  
  
src:  
    krb5-1.13.2-10.39.amzn1.src  
  
x86_64:  
    krb5-devel-1.13.2-10.39.amzn1.x86_64  
    krb5-pkinit-openssl-1.13.2-10.39.amzn1.x86_64  
    krb5-debuginfo-1.13.2-10.39.amzn1.x86_64  
    krb5-server-1.13.2-10.39.amzn1.x86_64  
    krb5-workstation-1.13.2-10.39.amzn1.x86_64  
    krb5-libs-1.13.2-10.39.amzn1.x86_64  
    krb5-server-ldap-1.13.2-10.39.amzn1.x86_64  

Additional References

Red Hat: CVE-2014-5355, CVE-2015-2694

Mitre: CVE-2014-5355, CVE-2015-2694