pam_krb5 Existing/Non-Existing Username Enumeration Weakness

BID:35112

Info

pam_krb5 Existing/Non-Existing Username Enumeration Weakness

Bugtraq ID: 35112
Class: Design Error
CVE: CVE-2009-1384
Remote: Yes
Local: No
Published: May 27 2009 12:00AM
Updated: May 07 2015 05:05PM
Credit: Jan Lieskovsky
Vulnerable: VMWare vMA 4.0 RHEL5
VMWare ESX Server 4.1
VMWare ESX Server 4.0
Russ Allbery pam_krb5 2.2.14
Redhat Enterprise Linux Desktop Workstation 5 client
Redhat Enterprise Linux Desktop 5 client
Redhat Enterprise Linux 5 Server
Mandriva Linux Mandrake 2009.1 x86_64
Mandriva Linux Mandrake 2009.1
Mandriva Linux Mandrake 2009.0 x86_64
Mandriva Linux Mandrake 2009.0
MandrakeSoft Enterprise Server 5 x86_64
MandrakeSoft Enterprise Server 5
Avaya IQ 5.1
Avaya IQ 5
Avaya Aura System Manager 5.2
Avaya Aura Application Enablement Services 5.2.1
Avaya Aura Application Enablement Services 5.2
Not Vulnerable: VMWare ESX Server 4.1 ESX410-201101201
VMWare ESX Server 4.0 ESX400-201005406
Avaya IQ 5.2
Avaya Aura System Manager 6.0
Avaya Aura Application Enablement Services 5.2.2

Discussion

pam_krb5 Existing/Non-Existing Username Enumeration Weakness

The 'pam_krb5' module is prone to a username-enumeration weakness because it displays different responses to login attempts, depending on whether or not the username exists.

Attackers may exploit this weakness to discern valid usernames. This may aid them in brute-force password cracking or other attacks.

This issue affects pam_krb5 2.2.14; other versions may also be affected.

Exploit / POC

pam_krb5 Existing/Non-Existing Username Enumeration Weakness

Attackers can use readily available tools to exploit this issue.

Solution / Fix

pam_krb5 Existing/Non-Existing Username Enumeration Weakness

Solution:
Updates are available. Please see the references for more information.


Mandriva Linux Mandrake 2009.1 x86_64

Mandriva Linux Mandrake 2009.0

MandrakeSoft Enterprise Server 5 x86_64

Mandriva Linux Mandrake 2009.0 x86_64

MandrakeSoft Enterprise Server 5

Mandriva Linux Mandrake 2009.1

References

pam_krb5 Existing/Non-Existing Username Enumeration Weakness

References:

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