The Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) 1.7 before 1.7.2, and 1.8 alpha, allows remote attackers to cause a denial of service (assertion failure and daemon crash) via an invalid (1) AS-REQ or (2) TGS-REQ request.

Emmanuel Bouillon discovered that Kerberos did not correctly handle certain message types. An unauthenticated remote attacker could send specially crafted traffic to cause the KDC to crash, leading to a denial of service. (CVE-2010-0283)

Nalin Dahyabhai, Jan iankko Lieskovsky, and Zbysek Mraz discovered that Kerberos did not correctly handle certain GSS packets. An unauthenticated remote attacker could send specially crafted traffic that would cause services using GSS-API to crash, leading to a denial of service. (CVE-2010-0628).

Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote host is affected by the vulnerability described in GLSA-201201-13 (MIT Kerberos 5: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in MIT Kerberos 5. Please       review the CVE identifiers referenced below for details.
  Impact :

    A remote attacker may be able to execute arbitrary code with the       privileges of the administration daemon or the Key Distribution Center       (KDC) daemon, cause a Denial of Service condition, or possibly obtain       sensitive information. Furthermore, a remote attacker may be able to       spoof Kerberos authorization, modify KDC responses, forge user data       messages, forge tokens, forge signatures, impersonate a client, modify       user-visible prompt text, or have other unspecified impact.
  Workaround :

    There is no known workaround at this time.

This update adds the upstream patch to avoid a potential denial of service in the KDC in versions 1.7 and later (CVE-2010-0283). It obsoletes a previous pending update to version 1.7.1, which incorporates a fix to avoid accidentally tripping account lockout logic on AD servers when the user types in the wrong password.

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Versions of Mac OS X 10.6 earlier than 10.6.4 are potentially affected by multiple vulnerabilities.  Mac OS X 10.6.4 contains security fixes for the following products :

  - CUPS

  - DesktopServices

  - Flash Player plug-in

  - Folder Manager

  - Help Viewer

  - iChat

  - ImageIO

Kerberos

  - libcurl

  - Network Authorization

  - Open Directory

  - Printer Setup

  - Printing

  - Ruby

  - SMB File Server

  - SquirrelMail

  - Wiki Server

The remote host is running a version of Mac OS X 10.6.x that is prior to 10.6.4.

Mac OS X 10.6.4 contains security fixes for the following components :

  - CUPS
  - DesktopServices
  - Flash Player plug-in
  - Folder Manager
  - Help Viewer
  - iChat
  - ImageIO
  - Kerberos
  - Kernel
  - libcurl
  - Network Authorization
  - Open Directory
  - Printer Setup
  - Printing
  - Ruby
  - SMB File Server
  - SquirrelMail
  - Wiki Server

Two vulnerabilities in krb5 can be used by remote attackers in denial of service attacks. The MIT security advisories report this as follows :

An unauthenticated remote attacker can send an invalid request to a KDC process that will cause it to crash due to an assertion failure, creating a denial of service.

An unauthenticated remote attacker could cause a GSS-API application, including the Kerberos administration daemon (kadmind) to crash.

Invalid requests by unauthenticated attackers could crash the kerberos server (CVE-2010-0283).

ID	Name	Product	Family	Severity
65122	Ubuntu 9.10 : krb5 vulnerabilities (USN-916-1)	Nessus	Ubuntu Local Security Checks	high
57655	GLSA-201201-13 : MIT Kerberos 5: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	medium
47267	Fedora 12 : krb5-1.7.1-2.fc12 (2010-1722)	Nessus	Fedora Local Security Checks	high
800793	Mac OS X 10.6 < 10.6.4 Multiple Vulnerabilities	Log Correlation Engine	Operating System Detection	high
5571	Mac OS X 10.6 < 10.6.4 Multiple Vulnerabilities	Nessus Network Monitor	Generic	critical
47023	Mac OS X 10.6.x < 10.6.4 Multiple Vulnerabilities	Nessus	MacOS X Local Security Checks	high
45571	FreeBSD : krb5 -- multiple denial of service vulnerabilities (9ac0f9c4-492b-11df-83fb-0015587e2cc1)	Nessus	FreeBSD Local Security Checks	high
44668	openSUSE Security Update : krb5 (krb5-2002)	Nessus	SuSE Local Security Checks	high

Detections

Analytics

CVE-2010-0283

high

Tenable Plugins

high

medium

high

high

critical

high

high

high