Multiple integer underflows in the (1) AES and (2) RC4 decryption functionality in the crypto library in MIT Kerberos 5 (aka krb5) 1.3 through 1.6.3, and 1.7 before 1.7.1, allow remote attackers to cause a denial of service (daemon crash) or possibly execute arbitrary code by providing ciphertext with a length that is too short to be valid.

The remote VMware ESX / ESXi host is missing a security-related patch.
It is, therefore, affected by multiple vulnerabilities, including remote code execution vulnerabilities, in several components and third-party libraries :

  - libpng
  - VMnc Codec
  - vmrun
  - VMware Remote Console (VMrc)
  - VMware Tools
  - vmware-authd

The remote OracleVM system is missing necessary patches to address critical security updates :

  - Fix for (CVE-2011-4862)

  - incorporate a fix to teach the file labeling bits about     when replay caches are expunged (#712453)

  - rebuild

  - ftp: handle larger command inputs (#665833)

  - don't bail halfway through an unlock operation when the     result will be discarded and the end-result not cleaned     up (Martin Osvald, #586032)

  - add a versioned dependency between krb5-server-ldap and     krb5-libs (internal tooling)

  - don't discard the error code from an error message     received in response to a change-password request     (#658871, RT#6893)

  - ftpd: add patch from Jatin Nansi to correctly match     restrict lines in /etc/ftpusers (#644215, RT#6889)

  - ftp: add modified patch from Rogan Kyuseok Lee to report     the number of bytes transferred correctly when     transferring large files on 32-bit systems (#648404)

  - backport fix for RT#6514: memory leak freeing rcache     type none (#678205)

  - add upstream patch to fix hang or crash in the KDC when     using the LDAP kdb backend (CVE-2011-0281,     CVE-2011-0282, #671097)

  - incorporate upstream patch for checksum acceptance     issues from MITKRB5-SA-2010-007 (CVE-2010-1323, #652308)

  - backport a fix to the previous change (#539423)

  - backport the k5login_directory and k5login_authoritative     settings (#539423)

  - krshd: don't limit user names to 16 chars when utmp can     handle names at least a bit longer than that (#611713)

  - fix a logic bug in computing key expiration times     (RT#6762, #627038)

  - correct the post-rotate scriptlet in the kadmind     logrotate config (more of #462658)

  - ftpd: backport changes to modify behavior to match     telnetd,rshd,rlogind and accept GSSAPI auth to any     service for which we have a matching key (#538075)

  - pull in fix for RT#5551 to treat the referral realm when     seen in a ticket as though it were the local realm     (#498554, also very likely #450122)

  - add aes256-cts:normal and aes128-cts:normal to the list     of keysalts in the default kdc.conf (part of #565941)

  - add a note to kdc.conf(5) pointing to the admin guide     for the list of recognized key and salt types (the rest     of #565941)

  - add logrotate configuration files for krb5kdc and     kadmind (#462658)

  - libgssapi: backport patch from svn to stop returning     context-expired errors when the ticket which was used to     set up the context expires (#605367, upstream #6739)

  - enable building the -server-ldap subpackage (#514362)

  - stop caring about the endianness of stash files     (#514741), which will be replaced by proper keytab files     in later releases

  - don't crash in krb5_get_init_creds_password if the     passed-in options struct is NULL and the clients keys     have expired (#555875)

  - ksu: perform PAM account and session management before     dropping privileges to those of the target user (#540769     and #596887, respectively)

  - add candidate patch to correct libgssapi null pointer     dereference which could be triggered by malformed client     requests (CVE-2010-1321, #583704)

  - fix a null pointer dereference and crash introduced in     our PAM patch that would happen if ftpd was given the     name of a user who wasnt known to the local system,     limited to being triggerable by gssapi-authenticated     clients by the default xinetd config (Olivier Fourdan,     #569472)

  - add upstream patch to fix a few use-after-free bugs,     including one in kadmind (CVE-2010-0629, #578186)

  - merge patch to correct KDC integer overflows which could     be triggered by malformed RC4 and AES ciphertexts     (CVE-2009-4212, #546348)

  - pull changes to libkrb5 to properly handle and chase     off-path referrals back from 1.7 (#546538)

  - add an auth stack to ksus PAM configuration so that it     can successfully pam_setcred

  - also set PAM_RUSER in ksu for completeness     (#479071+#477033)

  - fix various typos, except for bits pertaining to     licensing (#499190)

  - kdb5_util: when renaming a database, if the new names     associated lock files don't exist, go ahead and create     them (#442879)

  - ksu: perform PAM account and session management for the     target user  authentication is still performed as before     (#477033)

  - fix typo in ksus reporting of errors getting credentials     (#462890)

  - kadmind.init: stop setting up a keytab, as kadminds been     able to use the database directly for a while now     (#473151)

  - pull up patch to set PAM_RHOST (James Leddy, #479071)

The remote Oracle Linux 5 host has packages installed that are affected by a vulnerability as referenced in the ELSA-2010-0029 advisory.

    [1.6.1-36.el5_4.1]
    - add candidate patch to correct KDC integer overflows which could be       triggered by malformed RC4 and AES ciphertexts (CVE-2009-4212, #546347)

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

CVE-2009-4212 krb: KDC integer overflows in AES and RC4 decryption routines (MITKRB5-SA-2009-004)

Multiple integer underflow flaws, leading to heap-based corruption, were found in the way the MIT Kerberos Key Distribution Center (KDC) decrypted ciphertexts encrypted with the Advanced Encryption Standard (AES) and ARCFOUR (RC4) encryption algorithms. If a remote KDC client were able to provide a specially crafted AES- or RC4-encrypted ciphertext or texts, it could potentially lead to either a denial of service of the central KDC (KDC crash or abort upon processing the crafted ciphertext), or arbitrary code execution with the privileges of the KDC (i.e., root privileges). (CVE-2009-4212)

All running services using the MIT Kerberos libraries must be restarted for the update to take effect.

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.

a. Service Console OS update for COS kernel

   This patch updates the service console kernel to fix multiple    security issues.

   The Common Vulnerabilities and Exposures project (cve.mitre.org)    has assigned the names CVE-2010-0415, CVE-2010-0307,    CVE-2010-0291, CVE-2010-0622, CVE-2010-1087, CVE-2010-1437, and    CVE-2010-1088 to these issues.

b. Likewise package updates

   Updates to the likewisekrb5, likewiseopenldap, likewiseopen,    and pamkrb5 packages address several security issues.

   The Common Vulnerabilities and Exposures project (cve.mitre.org)    has assigned the names CVE-2009-0844, CVE-2009-0845,    CVE-2009-0846, CVE-2009-4212, and CVE-2010-1321 to these issues.

Specially crafted AES and RC4 packets could allow unauthenticated remote attackers to trigger an integer overflow leads to heap memory corruption (CVE-2009-4212). This has been fixed.

This update incorporates fixes from upstream which correct integer underflow problems in the AES and RC4 decryption routines (CVE-2009-4212).

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.

This update incorporates fixes from upstream which correct integer underflow problems in the AES and RC4 decryption routines (CVE-2009-4212). It also corrects a failure in 'kdb5_util load' which could occur when the database files being created did not previously exist.

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 10.5 that does not have Security Update 2010-004 applied. 

This security update contains fixes for the following components :

  - CUPS
  - DesktopServices
  - Flash Player plug-in
  - Folder Manager
  - iChat
  - ImageIO
  - Kerberos
  - Kernel
  - libcurl
  - Network Authorization
  - 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

a. Service Console update for COS kernel

   Updated COS package 'kernel' addresses the security issues that are    fixed through versions 2.6.18-164.11.1.

   The Common Vulnerabilities and Exposures project (cve.mitre.org)    has assigned the names CVE-2009-2695, CVE-2009-2908, CVE-2009-3228,    CVE-2009-3286, CVE-2009-3547, CVE-2009-3613 to the security issues    fixed in kernel 2.6.18-164.6.1

   The Common Vulnerabilities and Exposures project (cve.mitre.org)    has assigned the names CVE-2009-3612, CVE-2009-3620, CVE-2009-3621,    CVE-2009-3726 to the security issues fixed in kernel 2.6.18-164.9.1.

   The Common Vulnerabilities and Exposures project (cve.mitre.org)    has assigned the names CVE-2007-4567, CVE-2009-4536, CVE-2009-4537,    CVE-2009-4538 to the security issues fixed in kernel 2.6.18-164.10.1

   The Common Vulnerabilities and Exposures project (cve.mitre.org)    has assigned the names CVE-2006-6304, CVE-2009-2910, CVE-2009-3080,    CVE-2009-3556, CVE-2009-3889, CVE-2009-3939, CVE-2009-4020,    CVE-2009-4021, CVE-2009-4138, CVE-2009-4141, and CVE-2009-4272 to    the security issues fixed in kernel 2.6.18-164.11.1.

b. ESXi userworld update for ntp

   The Network Time Protocol (NTP) is used to synchronize the time of    a computer client or server to another server or reference time    source.

   A vulnerability in ntpd could allow a remote attacker to cause a    denial of service (CPU and bandwidth consumption) by using    MODE_PRIVATE to send a spoofed (1) request or (2) response packet    that triggers a continuous exchange of MODE_PRIVATE error responses    between two NTP daemons.

   The Common Vulnerabilities and Exposures Project (cve.mitre.org)    has assigned the name CVE-2009-3563 to this issue.

c. Service Console package openssl updated to 0.9.8e-12.el5_4.1

   OpenSSL is a toolkit implementing SSL v2/v3 and TLS protocols with    full-strength cryptography world-wide.

   A memory leak in the zlib could allow a remote attacker to cause a    denial of service (memory consumption) via vectors that trigger    incorrect calls to the CRYPTO_cleanup_all_ex_data function.

   The Common Vulnerabilities and Exposures Project (cve.mitre.org)    has assigned the name CVE-2009-4355 to this issue.

   A vulnerability was discovered which may allow remote attackers to    spoof certificates by using MD2 design flaws to generate a hash    collision in less than brute-force time. NOTE: the scope of this    issue is currently limited because the amount of computation    required is still large.

   The Common Vulnerabilities and Exposures Project (cve.mitre.org)    has assigned the name CVE-2009-2409 to this issue.

   This update also includes security fixes that were first addressed    in version openssl-0.9.8e-12.el5.i386.rpm.

   The Common Vulnerabilities and Exposures Project (cve.mitre.org)    has assigned the names CVE-2009-0590, CVE-2009-1377, CVE-2009-1378,    CVE-2009-1379, CVE-2009-1386 and CVE-2009-1387 to these issues.

d. Service Console update for krb5 to 1.6.1-36.el5_4.1 and pam_krb5 to    2.2.14-15.

   Kerberos is a network authentication protocol. It is designed to    provide strong authentication for client/server applications by    using secret-key cryptography.

   Multiple integer underflows in the AES and RC4 functionality in the    crypto library could allow remote attackers to cause a denial of    service (daemon crash) or possibly execute arbitrary code by    providing ciphertext with a length that is too short to be valid.

   The Common Vulnerabilities and Exposures Project (cve.mitre.org)    has assigned the name CVE-2009-4212 to this issue.

   The service console package for pam_krb5 is updated to version    pam_krb5-2.2.14-15. This update fixes a flaw found in pam_krb5. In    some non-default configurations (specifically, where pam_krb5 would    be the first module to prompt for a password), a remote attacker    could use this flaw to recognize valid usernames, which would aid a    dictionary-based password guess attack.

   The Common Vulnerabilities and Exposures Project (cve.mitre.org)    has assigned the name CVE-2009-1384 to this issue.

e. Service Console package bind updated to 9.3.6-4.P1.el5_4.2

   BIND (Berkeley Internet Name Daemon) is by far the most widely used    Domain Name System (DNS) software on the Internet.

   A vulnerability was discovered which could allow remote attacker to    add the Authenticated Data (AD) flag to a forged NXDOMAIN response    for an existing domain.

   The Common Vulnerabilities and Exposures Project (cve.mitre.org)    has assigned the name CVE-2010-0097 to this issue.

   A vulnerability was discovered which could allow remote attackers    to conduct DNS cache poisoning attacks by receiving a recursive    client query and sending a response that contains CNAME or DNAME    records, which do not have the intended validation before caching.

   The Common Vulnerabilities and Exposures Project (cve.mitre.org)    has assigned the name CVE-2010-0290 to this issue.

   A vulnerability was found in the way that bind handles out-of-    bailiwick data accompanying a secure response without re-fetching    from the original source, which could allow remote attackers to    have an unspecified impact via a crafted response.

   The Common Vulnerabilities and Exposures Project (cve.mitre.org)    has assigned the name CVE-2010-0382 to this issue.

   NOTE: ESX does not use the BIND name service daemon by default.

f. Service Console package gcc updated to 3.2.3-60

   The GNU Compiler Collection includes front ends for C, C++,    Objective-C, Fortran, Java, and Ada, as well as libraries for these    languages

   GNU Libtool's ltdl.c attempts to open .la library files in the    current working directory.  This could allow a local user to gain    privileges via a Trojan horse file.  The GNU C Compiler collection    (gcc) provided in ESX contains a statically linked version of the    vulnerable code, and is being replaced.

   The Common Vulnerabilities and Exposures Project (cve.mitre.org)    has assigned the name CVE-2009-3736 to this issue.

g. Service Console package gzip update to 1.3.3-15.rhel3

   gzip is a software application used for file compression

   An integer underflow in gzip's unlzw function on 64-bit platforms    may allow a remote attacker to trigger an array index error    leading to a denial of service (application crash) or possibly    execute arbitrary code via a crafted LZW compressed file.

   The Common Vulnerabilities and Exposures Project (cve.mitre.org)    has assigned the name CVE-2010-0001 to this issue.

h. Service Console package sudo updated to 1.6.9p17-6.el5_4

   Sudo (su 'do') allows a system administrator to delegate authority    to give certain users (or groups of users) the ability to run some    (or all) commands as root or another user while providing an audit    trail of the commands and their arguments.

   When a pseudo-command is enabled, sudo permits a match between the    name of the pseudo-command and the name of an executable file in an    arbitrary directory, which allows local users to gain privileges    via a crafted executable file.

   The Common Vulnerabilities and Exposures Project (cve.mitre.org)    has assigned the name CVE-2010-0426 to this issue.

   When the runas_default option is used, sudo does not properly set    group memberships, which allows local users to gain privileges via    a sudo command.

   The Common Vulnerabilities and Exposures Project (cve.mitre.org)    has assigned the name CVE-2010-0427 to this issue.

It was discovered that krb5, a system for authenticating users and services on a network, is prone to integer underflow in the AES and RC4 decryption operations of the crypto library. A remote attacker can cause crashes, heap corruption, or, under extraordinarily unlikely conditions, arbitrary code execution.

Specially crafted AES and RC4 packets could allow unauthenticated remote attackers to trigger an integer underflow that leads to heap memory corruption (CVE-2009-4212). This has been fixed.

Specially crafted ticket requests could crash the kerberos server (CVE-2009-3295).

Specially crafted AES and RC4 packets could allow unauthenticated remote attackers to trigger an integer underflow that leads to heap memory corruption (CVE-2009-4212).

Specially crafted AES and RC4 packets could allow unauthenticated remote attackers to trigger an integer overflow leads to heap memory corruption (CVE-2009-4212).

A vulnerability has been found and corrected in krb5 :

Multiple integer underflows in the (1) AES and (2) RC4 decryption functionality in the crypto library in MIT Kerberos 5 (aka krb5) 1.3 through 1.6.3, and 1.7 before 1.7.1, allow remote attackers to cause a denial of service (daemon crash) or possibly execute arbitrary code by providing ciphertext with a length that is too short to be valid (CVE-2009-4212).

Packages for 2008.0 are provided for Corporate Desktop 2008.0 customers.

The updated packages have been patched to correct this issue.

It was discovered that Kerberos did not correctly handle invalid AES blocks. An unauthenticated remote attacker could send specially crafted traffic that would crash the KDC service, leading to a denial of service, or possibly execute arbitrary code with root privileges.

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.

Updated krb5 packages that fix multiple security issues are now available for Red Hat Enterprise Linux 3, 4, and 5, and Red Hat Enterprise Linux 4.7, 5.2, and 5.3 Extended Update Support.

This update has been rated as having critical security impact by the Red Hat Security Response Team.

Kerberos is a network authentication system which allows clients and servers to authenticate to each other using symmetric encryption and a trusted third party, the Key Distribution Center (KDC).

Multiple integer underflow flaws, leading to heap-based corruption, were found in the way the MIT Kerberos Key Distribution Center (KDC) decrypted ciphertexts encrypted with the Advanced Encryption Standard (AES) and ARCFOUR (RC4) encryption algorithms. If a remote KDC client were able to provide a specially crafted AES- or RC4-encrypted ciphertext or texts, it could potentially lead to either a denial of service of the central KDC (KDC crash or abort upon processing the crafted ciphertext), or arbitrary code execution with the privileges of the KDC (i.e., root privileges). (CVE-2009-4212)

All krb5 users should upgrade to these updated packages, which contain a backported patch to correct these issues. All running services using the MIT Kerberos libraries must be restarted for the update to take effect.

ID	Name	Product	Family	Severity
89740	VMware ESX / ESXi Third-Party Libraries and Components (VMSA-2010-0009) (remote check)	Nessus	VMware ESX Local Security Checks	critical
79475	OracleVM 2.2 : krb5 (OVMSA-2011-0015)	Nessus	OracleVM Local Security Checks	low
67984	Oracle Linux 5 : krb5 (ELSA-2010-0029)	Nessus	Oracle Linux Local Security Checks	critical
60721	Scientific Linux Security Update : krb5 on SL3.x, SL4.x, SL5.x i386/x86_64	Nessus	Scientific Linux Local Security Checks	critical
57655	GLSA-201201-13 : MIT Kerberos 5: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	medium
50611	VMSA-2010-0016 : VMware ESXi and ESX third-party updates for Service Console and Likewise components	Nessus	VMware ESX Local Security Checks	critical
49875	SuSE 10 Security Update : Kerberos 5 (ZYPP Patch Number 6776)	Nessus	SuSE Local Security Checks	critical
47188	Fedora 11 : krb5-1.6.3-23.fc11 (2010-0515)	Nessus	Fedora Local Security Checks	critical
47187	Fedora 12 : krb5-1.7-18.fc12 (2010-0503)	Nessus	Fedora Local Security Checks	critical
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
47024	Mac OS X Multiple Vulnerabilities (Security Update 2010-004)	Nessus	MacOS X Local Security Checks	high
47023	Mac OS X 10.6.x < 10.6.4 Multiple Vulnerabilities	Nessus	MacOS X Local Security Checks	high
46765	VMSA-2010-0009 : ESXi ntp and ESX Service Console third-party updates	Nessus	VMware ESX Local Security Checks	high
44834	Debian DSA-1969-1 : krb5 - integer underflow	Nessus	Debian Local Security Checks	critical
44093	SuSE 10 Security Update : Kerberos 5 (ZYPP Patch Number 6775)	Nessus	SuSE Local Security Checks	critical
44092	SuSE 11 Security Update : Kerberos 5 (SAT Patch Number 1796)	Nessus	SuSE Local Security Checks	critical
44090	openSUSE Security Update : krb5 (krb5-1792)	Nessus	SuSE Local Security Checks	critical
44088	openSUSE Security Update : krb5 (krb5-1795)	Nessus	SuSE Local Security Checks	critical
44086	openSUSE Security Update : krb5 (krb5-1795)	Nessus	SuSE Local Security Checks	critical
43881	Mandriva Linux Security Advisory : krb5 (MDVSA-2010:006)	Nessus	Mandriva Local Security Checks	critical
43874	Ubuntu 6.06 LTS / 8.04 LTS / 8.10 / 9.04 / 9.10 : krb5 vulnerability (USN-881-1)	Nessus	Ubuntu Local Security Checks	critical
43868	RHEL 3 / 4 / 5 : krb5 (RHSA-2010:0029)	Nessus	Red Hat Local Security Checks	critical
43866	CentOS 3 / 4 / 5 : krb5 (CESA-2010:0029)	Nessus	CentOS Local Security Checks	critical

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