MIT Kerberos LDAP descriptor denial of service

kerberos-ldap-descriptor-dos (65324) The risk level is classified as MediumMedium Risk

Description:

MIT Kerberos is vulnerable to a denial of service, caused by a file descriptor leak in the Key Distribution Center (KDC) daemon when configured with an LDAP back end. By sending a specially-crafted request, a remote attacker could exploit this vulnerability to cause the daemon to hang.

*CVSS:

Base Score: 5
  Access Vector: Network
  Access Complexity: Low
  Authentication: None
  Confidentiality Impact: None
  Integrity Impact: None
  Availability Impact: Partial
 
Temporal Score: 3.7
  Exploitability: Unproven
  Remediation Level: Official-Fix
  Report Confidence: Confirmed

Consequences:

Denial of Service

Remedy:

Refer to MITKRB5-SA-2011-002 for patch, upgrade or suggested workaround information. See References.

References:

  • MITKRB5-SA-2011-002: KDC denial of service attacks.
  • BID-46265: MIT Kerberos KDC LDAP File Descriptor Leak Denial Of Service Vulnerability
  • CVE-2011-0281: The unparse implementation in the Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) 1.6.x through 1.9, when an LDAP backend is used, allows remote attackers to cause a denial of service (file descriptor exhaustion and daemon hang) via a principal name that triggers use of a backslash escape sequence, as demonstrated by a \n sequence.
  • OSVDB ID: 70908: MIT Kerberos 5 Key Distribution Center (KDC) LDAP Backend Unparse Implementation DoS
  • RHSA-2011-0199: Important: krb5 security update
  • RHSA-2011-0200: Important: krb5 security update
  • SA43260: Kerberos Multiple Denial of Service Vulnerabilities
  • SA44284: Oracle Solaris Kerberos Multiple Vulnerabilities
  • SA46397: VMware ESX / ESXi Server Multiple Vulnerabilities
  • SUSE-SR:2011:004: SUSE Security Summary Report

Platforms Affected:

  • MIT Kerberos 5-1.6
  • MIT Kerberos 5-1.7
  • MIT Kerberos 5-1.8
  • MIT Kerberos 5-1.9
  • RedHat Enterprise Linux 5 Client Workstation
  • RedHat Enterprise Linux 5
  • RedHat Enterprise Linux 5 Client
  • RedHat Enterprise Linux 6 Server
  • RedHat Enterprise Linux 6 Workstation
  • RedHat Enterprise Linux Desktop 6
  • RedHat Enterprise Linux EUS 5.6.z
  • RedHat Enterprise Linux HPC Node 6
  • RedHat Enterprise Linux Long Life 5.6
  • RedHat Enterprise Linux Server EUS 6.0.z

Reported:

Feb 08, 2011

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