ID CVE-2009-1384
Summary pam_krb5 2.2.14 through 2.3.4, as used in Red Hat Enterprise Linux (RHEL) 5, generates different password prompts depending on whether the user account exists, which allows remote attackers to enumerate valid usernames.
References
Vulnerable Configurations
  • cpe:2.3:o:redhat:enterprise_linux:5:*:*:*:*:*:*:*
    cpe:2.3:o:redhat:enterprise_linux:5:*:*:*:*:*:*:*
  • cpe:2.3:o:redhat:enterprise_linux:5:*:client:*:*:*:*:*
    cpe:2.3:o:redhat:enterprise_linux:5:*:client:*:*:*:*:*
  • cpe:2.3:o:redhat:enterprise_linux:5:*:client_workstation:*:*:*:*:*
    cpe:2.3:o:redhat:enterprise_linux:5:*:client_workstation:*:*:*:*:*
  • cpe:2.3:o:redhat:enterprise_linux:5:*:server:*:*:*:*:*
    cpe:2.3:o:redhat:enterprise_linux:5:*:server:*:*:*:*:*
  • cpe:2.3:a:eyrie:pam-krb5:2.2.14:*:*:*:*:*:*:*
    cpe:2.3:a:eyrie:pam-krb5:2.2.14:*:*:*:*:*:*:*
  • cpe:2.3:a:eyrie:pam-krb5:2.3:*:*:*:*:*:*:*
    cpe:2.3:a:eyrie:pam-krb5:2.3:*:*:*:*:*:*:*
  • cpe:2.3:a:eyrie:pam-krb5:2.3.4:*:*:*:*:*:*:*
    cpe:2.3:a:eyrie:pam-krb5:2.3.4:*:*:*:*:*:*:*
CVSS
Base: 5.0 (as of 10-10-2018 - 19:36)
Impact:
Exploitability:
CWE CWE-287
CAPEC
  • Authentication Abuse
    An attacker obtains unauthorized access to an application, service or device either through knowledge of the inherent weaknesses of an authentication mechanism, or by exploiting a flaw in the authentication scheme's implementation. In such an attack an authentication mechanism is functioning but a carefully controlled sequence of events causes the mechanism to grant access to the attacker. This attack may exploit assumptions made by the target's authentication procedures, such as assumptions regarding trust relationships or assumptions regarding the generation of secret values. This attack differs from Authentication Bypass attacks in that Authentication Abuse allows the attacker to be certified as a valid user through illegitimate means, while Authentication Bypass allows the user to access protected material without ever being certified as an authenticated user. This attack does not rely on prior sessions established by successfully authenticating users, as relied upon for the "Exploitation of Session Variables, Resource IDs and other Trusted Credentials" attack patterns.
  • Exploiting Trust in Client (aka Make the Client Invisible)
    An attack of this type exploits a programs' vulnerabilities in client/server communication channel authentication and data integrity. It leverages the implicit trust a server places in the client, or more importantly, that which the server believes is the client. An attacker executes this type of attack by placing themselves in the communication channel between client and server such that communication directly to the server is possible where the server believes it is communicating only with a valid client. There are numerous variations of this type of attack.
  • Utilizing REST's Trust in the System Resource to Register Man in the Middle
    This attack utilizes a REST(REpresentational State Transfer)-style applications' trust in the system resources and environment to place man in the middle once SSL is terminated. Rest applications premise is that they leverage existing infrastructure to deliver web services functionality. An example of this is a Rest application that uses HTTP Get methods and receives a HTTP response with an XML document. These Rest style web services are deployed on existing infrastructure such as Apache and IIS web servers with no SOAP stack required. Unfortunately from a security standpoint, there frequently is no interoperable identity security mechanism deployed, so Rest developers often fall back to SSL to deliver security. In large data centers, SSL is typically terminated at the edge of the network - at the firewall, load balancer, or router. Once the SSL is terminated the HTTP request is in the clear (unless developers have hashed or encrypted the values, but this is rare). The attacker can utilize a sniffer such as Wireshark to snapshot the credentials, such as username and password that are passed in the clear once SSL is terminated. Once the attacker gathers these credentials, they can submit requests to the web service provider just as authorized user do. There is not typically an authentication on the client side, beyond what is passed in the request itself so once this is compromised, then this is generally sufficient to compromise the service's authentication scheme.
  • Man in the Middle Attack
    This type of attack targets the communication between two components (typically client and server). The attacker places himself in the communication channel between the two components. Whenever one component attempts to communicate with the other (data flow, authentication challenges, etc.), the data first goes to the attacker, who has the opportunity to observe or alter it, and it is then passed on to the other component as if it was never intercepted. This interposition is transparent leaving the two compromised components unaware of the potential corruption or leakage of their communications. The potential for Man-in-the-Middle attacks yields an implicit lack of trust in communication or identify between two components.
Access
VectorComplexityAuthentication
NETWORK LOW NONE
Impact
ConfidentialityIntegrityAvailability
PARTIAL NONE NONE
cvss-vector via4 AV:N/AC:L/Au:N/C:P/I:N/A:N
oval via4
  • accepted 2014-01-20T04:01:31.803-05:00
    class vulnerability
    contributors
    • name J. Daniel Brown
      organization DTCC
    • name Chris Coffin
      organization The MITRE Corporation
    definition_extensions
    comment VMware ESX Server 4.0 is installed
    oval oval:org.mitre.oval:def:6293
    description pam_krb5 2.2.14 through 2.3.4, as used in Red Hat Enterprise Linux (RHEL) 5, generates different password prompts depending on whether the user account exists, which allows remote attackers to enumerate valid usernames.
    family unix
    id oval:org.mitre.oval:def:7081
    status accepted
    submitted 2010-06-01T17:30:00.000-05:00
    title pam_krb5 Existing/Non-Existing Username Enumeration Weakness
    version 8
  • accepted 2013-04-29T04:21:04.825-04:00
    class vulnerability
    contributors
    • name Aharon Chernin
      organization SCAP.com, LLC
    • name Dragos Prisaca
      organization G2, Inc.
    definition_extensions
    • comment The operating system installed on the system is Red Hat Enterprise Linux 5
      oval oval:org.mitre.oval:def:11414
    • comment The operating system installed on the system is CentOS Linux 5.x
      oval oval:org.mitre.oval:def:15802
    • comment Oracle Linux 5.x
      oval oval:org.mitre.oval:def:15459
    description pam_krb5 2.2.14 through 2.3.4, as used in Red Hat Enterprise Linux (RHEL) 5, generates different password prompts depending on whether the user account exists, which allows remote attackers to enumerate valid usernames.
    family unix
    id oval:org.mitre.oval:def:9652
    status accepted
    submitted 2010-07-09T03:56:16-04:00
    title pam_krb5 2.2.14 through 2.3.4, as used in Red Hat Enterprise Linux (RHEL) 5, generates different password prompts depending on whether the user account exists, which allows remote attackers to enumerate valid usernames.
    version 18
redhat via4
advisories
bugzilla
id 509092
title pam_krb5 update breaks graphical apps (gnome and kde)
oval
AND
  • comment Red Hat Enterprise Linux 5 is installed
    oval oval:com.redhat.rhba:tst:20070331001
  • comment pam_krb5 is earlier than 0:2.2.14-15
    oval oval:com.redhat.rhsa:tst:20100258002
  • comment pam_krb5 is signed with Red Hat redhatrelease key
    oval oval:com.redhat.rhsa:tst:20080907003
rhsa
id RHSA-2010:0258
released 2010-03-30
severity Low
title RHSA-2010:0258: pam_krb5 security and bug fix update (Low)
rpms pam_krb5-0:2.2.14-15
refmap via4
bid 35112
bugtraq 20110211 VMSA-2011-0003 Third party component updates for VMware vCenter Server, vCenter Update Manager, ESXi and ESX
confirm
mandriva MDVSA-2010:054
mlist [oss-security] 20090527 CVE assignment notification (pam_krb5 CVE-2009-1384)
osvdb 54791
secunia
  • 35230
  • 43314
vupen ADV-2009-1448
statements via4
contributor Tomas Hoger
lastmodified 2010-03-31
organization Red Hat
statement This issue did not affect the versions of the pam_krb5 packages, as shipped with Red Hat Enterprise Linux 3 and 4. The issue was addressed in the pam_krb5 packages as shipped with Red Hat Enterprise Linux 5 via: https://rhn.redhat.com/errata/RHSA-2010-0258.html
Last major update 10-10-2018 - 19:36
Published 28-05-2009 - 20:30
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