digestmd5.c in the CMU Cyrus Simple Authentication and Security Layer (SASL) library 2.1.18, and possibly other versions before 2.1.21, allows remote unauthenticated attackers to cause a denial of service (segmentation fault) via malformed inputs in DIGEST-MD5 negotiation.

From Red Hat Security Advisory 2007:0878 :

Updated cyrus-sasl packages that correct a security issue are now available for Red Hat Enterprise Linux 3.

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

The cyrus-sasl package contains the Cyrus implementation of SASL. SASL is the Simple Authentication and Security Layer, a method for adding authentication support to connection-based protocols.

A bug was found in cyrus-sasl's DIGEST-MD5 authentication mechanism.
As part of the DIGEST-MD5 authentication exchange, the client is expected to send a specific set of information to the server. If one of these items (the 'realm') was not sent or was malformed, it was possible for a remote unauthenticated attacker to cause a denial of service (segmentation fault) on the server. (CVE-2006-1721)

Users of cyrus-sasl should upgrade to these updated packages, which contain a backported patch to correct this issue.

From Red Hat Security Advisory 2007:0795 :

An updated cyrus-sasl package that addresses a security issue and fixes various other bugs is now available for Red Hat Enterprise Linux 4.

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

The cyrus-sasl package contains the Cyrus implementation of SASL. SASL is the Simple Authentication and Security Layer, a method for adding authentication support to connection-based protocols.

A bug was found in cyrus-sasl's DIGEST-MD5 authentication mechanism.
As part of the DIGEST-MD5 authentication exchange, the client is expected to send a specific set of information to the server. If one of these items (the 'realm') was not sent or was malformed, it was possible for a remote unauthenticated attacker to cause a denial of service (segmentation fault) on the server. (CVE-2006-1721)

This errata also fixes the following bugs :

* the Kerberos 5 library included in Red Hat Enterprise Linux 4 was not thread safe. This update adds functionality which allows it to be used safely in a threaded application.

* several memory leak bugs were fixed in cyrus-sasl's DIGEST-MD5 authentication plug-in.

* /dev/urandom is now used by default on systems which don't support hwrandom. Previously, dev/random was the default.

* cyrus-sasl needs zlib-devel to build properly. This dependency information is now included in the package.

Users are advised to upgrade to this updated cyrus-sasl package, which resolves these issues.

A bug was found in cyrus-sasl's DIGEST-MD5 authentication mechanism.
As part of the DIGEST-MD5 authentication exchange, the client is expected to send a specific set of information to the server. If one of these items (the 'realm') was not sent or was malformed, it was possible for a remote unauthenticated attacker to cause a denial of service (segmentation fault) on the server. (CVE-2006-1721)

This errata also fixes the following bugs in Scientific Linux 4 :

  - the Kerberos 5 library included in Red Hat Enterprise     Linux 4 was not thread safe. This update adds     functionality which allows it to be used safely in a     threaded application.

  - several memory leak bugs were fixed in cyrus-sasl's     DIGEST-MD5 authentication plug-in.

  - /dev/urandom is now used by default on systems which     don't support hwrandom. Previously, dev/random was the     default.

  - cyrus-sasl needs zlib-devel to build properly. This     dependency information is now included in the package.

a. VMware Tools Local Privilege Escalation on Windows-based guest OS

   The VMware Tools Package provides support required for shared folders    (HGFS) and other features.

   An input validation error is present in the Windows-based VMware    HGFS.sys driver.   Exploitation of this flaw might result in    arbitrary code execution on the guest system by an unprivileged    guest user.  It doesn't matter on what host the Windows guest OS    is running, as this is a guest driver vulnerability and not a    vulnerability on the host.

   The HGFS.sys driver is present in the guest operating system if the    VMware Tools package is loaded.  Even if the host has HGFS disabled    and has no shared folders, Windows-based guests may be affected. This    is regardless if a host supports HGFS.

   This issue could be mitigated by removing the VMware Tools package    from Windows based guests.  However this is not recommended as it    would impact usability of the product.

   NOTE: Installing the new hosted release or ESX patches will not          remediate the issue.  The VMware Tools packages will need          to be updated on each Windows-based guest followed by a          reboot of the guest system.

   VMware would like to thank iDefense and Stephen Fewer of Harmony    Security for reporting this issue to us.

   The Common Vulnerabilities and Exposures project (cve.mitre.org)    has assigned the name CVE-2007-5671 to this issue.

b. Privilege escalation on ESX or Linux based hosted operating systems

   This update fixes a security issue related to local exploitation of    an untrusted library path vulnerability in vmware-authd. In order to    exploit this vulnerability, an attacker must have local access and    the ability to execute the set-uid vmware-authd binary on an affected    system. Exploitation of this flaw might result in arbitrary code    execution on the Linux host system by an unprivileged user.

   VMware would like to thank iDefense for reporting this issue to us.

   The Common Vulnerabilities and Exposures project (cve.mitre.org)    has assigned the name CVE-2008-0967 to this issue.

c. Openwsman Invalid Content-Length Vulnerability

   Openwsman is a system management platform that implements the Web    Services Management protocol (WS-Management). It is installed and    running by default. It is used in the VMware Management Service    Console and in ESXi.

   The openwsman management service on ESX 3.5 and ESXi 3.5 is vulnerable    to a privilege escalation vulnerability, which may allow users with    non-privileged ESX or Virtual Center accounts to gain root privileges.

   To exploit this vulnerability, an attacker would need a local ESX    account or a VirtualCenter account with the Host.Cim.CimInteraction    permission.

   Systems with no local ESX accounts and no VirtualCenter accounts with    the Host.Cim.CimInteraction permission are not vulnerable.

   This vulnerability cannot be exploited by users without valid login    credentials.

   Discovery: Alexander Sotirov, VMware Security Research

   The Common Vulnerabilities and Exposures project (cve.mitre.org)    has assigned the name CVE-2008-2097 to this issue.

d. VMware VIX Application Programming Interface (API) Memory Overflow    Vulnerabilities

   The VIX API (also known as 'Vix') is an API that lets users write scripts    and programs to manipulate virtual machines.

   Multiple buffer overflow vulnerabilities are present in the VIX API.
   Exploitation of these vulnerabilities might result in a privilege    escalation on the host system. This exploit scenario is relevant for all    affected products. On VC, ESX30x, and ESX35, users need to have the VM    Interaction Privilege in order to exploit the vulnerability.

   Exploitation of these vulnerabilities might also result in code execution on    the host system from the guest system or on the service console in ESX Server    from the guest operating system. This exploit scenario is relevant for    Workstation 6.0.x (version 6.0.3 and below), Player 2.0.x (version 2.0.3 and    below), ACE 2.0.x (version 2.0.3 and below), Server 1.0.x (version 1.0.5 and    below), and ESX3.5. The parameter 'vix.inGuest.enable' in the VMware    configuration file must be set to true to allow for exploitation on these    products. Note that the parameter 'vix-inGuest.enable' is set to false by    default.

   The parameter 'vix.inGuest.enable' is present in the    following products :

     VMware Workstation 6.0.2 and higher      VMware ACE 6.0.2 and higher      VMware Server 1.06 and higher      VMware Fusion 1.1.2 and higher      ESX Server 3.0 and higher      ESX Server 3.5 and higher

   In previous versions of VMware products where the VIX API was introduced,    the VIX API couldn't be disabled.

   This vulnerability is present in ESX and the hosted products even if you    have not installed the VIX API. To patch your system you will need to    update to the new hosted product version or to apply the appropriate ESX    patch. It is not necessary to update the VIX API if you have installed    the VIX API.

   VMware would like to thank Andrew Honig of the Department of    Defense for reporting this issue.

   The Common Vulnerabilities and Exposures project (cve.mitre.org)    has assigned the name CVE-2008-2100 to this issue.

II Service Console rpm updates

 NOTE: ESXi and hosted products are not affected by any service console        security updates

 a. Security update for cyrus-sasl

   Updated cyrus-sasl package for the ESX Service Console corrects a security    issue found in the DIGEST-MD5 authentication mechanism of Cyrus'    implementation of Simple Authentication and Security Layer (SASL). As a    result of this issue in the authentication mechanism, a remote    unauthenticated attacker might be able to cause a denial of service error    on the service console.

   The Common Vulnerabilities and Exposures project (cve.mitre.org) has    assigned the name CVE-2006-1721 to this issue.

 b. Security update for tcltk

   An input validation flaw was discovered in Tk's GIF image handling. A    code-size value read from a GIF image was not properly validated before    being used, leading to a buffer overflow. A specially crafted GIF file    could use this to cause a crash or, potentially, execute code with the    privileges of the application using the Tk graphical toolkit.

   The Common Vulnerabilities and Exposures project (cve.mitre.org) has    assigned the name CVE-2008-0553 to this issue.

   A buffer overflow flaw was discovered in Tk's animated GIF image handling.
   An animated GIF containing an initial image smaller than subsequent images    could cause a crash or, potentially, execute code with the privileges of    the application using the Tk library.

   The Common Vulnerabilities and Exposures project (cve.mitre.org) has    assigned the name CVE-2007-5378 to this issue.

   A flaw first discovered in the Tcl regular expression engine used in the    PostgreSQL database server, resulted in an infinite loop when processing    certain regular expressions.

   The Common Vulnerabilities and Exposures project (cve.mitre.org) has    assigned the name CVE-2007-4772 to this issue.

 c. Security update for unzip

   This patch includes a moderate security update to the service console that    fixes a flaw in unzip. An attacker could execute malicious code with a    user's privileges if the user ran unzip on a file designed to leverage    this flaw.

   The Common Vulnerabilities and Exposures project (cve.mitre.org) has    assigned the name CVE-2008-0888 to this issue.

 d. Security update for krb5

   KDC in MIT Kerberos 5 (krb5kdc) does not set a global variable    for some krb4 message types, which allows remote attackers to    cause a denial of service (crash) and possibly execute arbitrary    code via crafted messages that trigger a NULL pointer dereference    or double-free.

   The Common Vulnerabilities and Exposures project (cve.mitre.org)    has assigned the name CVE-2008-0062 to this issue.

   NOTE: ESX doesn't contain the krb5kdc binary and is not vulnerable          to this issue.

   The Kerberos 4 support in KDC in MIT Kerberos 5 (krb5kdc) does not    properly clear the unused portion of a buffer when generating an    error message, which might allow remote attackers to obtain    sensitive information, aka 'Uninitialized stack values.'

   The Common Vulnerabilities and Exposures project (cve.mitre.org)    has assigned the name CVE-2008-0063 to this issue.

   NOTE: ESX doesn't contain the krb5kdc binary and is not vulnerable          to this issue.

   Buffer overflow in the RPC library (lib/rpc/rpc_dtablesize.c) used    by libgssrpc and kadmind in MIT Kerberos 5 (krb5) 1.2.2, and probably    other versions before 1.3, when running on systems whose unistd.h    does not define the FD_SETSIZE macro, allows remote attackers to cause    a denial of service (crash) and possibly execute arbitrary code by    triggering a large number of open file descriptors.

   The Common Vulnerabilities and Exposures project (cve.mitre.org)    has assigned the name CVE-2008-0948 to this issue.

An updated cyrus-sasl package that addresses a security issue and fixes various other bugs is now available for Red Hat Enterprise Linux 4.

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

The cyrus-sasl package contains the Cyrus implementation of SASL. SASL is the Simple Authentication and Security Layer, a method for adding authentication support to connection-based protocols.

A bug was found in cyrus-sasl's DIGEST-MD5 authentication mechanism.
As part of the DIGEST-MD5 authentication exchange, the client is expected to send a specific set of information to the server. If one of these items (the 'realm') was not sent or was malformed, it was possible for a remote unauthenticated attacker to cause a denial of service (segmentation fault) on the server. (CVE-2006-1721)

This errata also fixes the following bugs :

* the Kerberos 5 library included in Red Hat Enterprise Linux 4 was not thread safe. This update adds functionality which allows it to be used safely in a threaded application.

* several memory leak bugs were fixed in cyrus-sasl's DIGEST-MD5 authentication plug-in.

* /dev/urandom is now used by default on systems which don't support hwrandom. Previously, dev/random was the default.

* cyrus-sasl needs zlib-devel to build properly. This dependency information is now included in the package.

Users are advised to upgrade to this updated cyrus-sasl package, which resolves these issues.

Updated cyrus-sasl packages that correct a security issue are now available for Red Hat Enterprise Linux 3.

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

The cyrus-sasl package contains the Cyrus implementation of SASL. SASL is the Simple Authentication and Security Layer, a method for adding authentication support to connection-based protocols.

A bug was found in cyrus-sasl's DIGEST-MD5 authentication mechanism.
As part of the DIGEST-MD5 authentication exchange, the client is expected to send a specific set of information to the server. If one of these items (the 'realm') was not sent or was malformed, it was possible for a remote unauthenticated attacker to cause a denial of service (segmentation fault) on the server. (CVE-2006-1721)

Users of cyrus-sasl should upgrade to these updated packages, which contain a backported patch to correct this issue.

The Mu Security research team discovered a denial of service condition in the Simple Authentication and Security Layer authentication library (SASL) during DIGEST-MD5 negotiation. This potentially affects multiple products that use SASL DIGEST-MD5 authentication including OpenLDAP, Sendmail, Postfix, etc.

The remote host is running a version of Mac OS X 10.4 that is older than version 10.4.8.  Mac OS X 10.4.8 contains several security fixes for the following programs :
 - CFNetwork
 - Flash Player
 - ImageIO
 - Kernel
 - LoginWindow
 - Preferences
 - QuickDraw Manager
 - SASL
 - WebCore
 - Workgroup Manager

The remote host is running a version of Mac OS X 10.3 which does not have the security update 2006-006 applied.

Security Update 2006-006 contains several security fixes for the following programs :

 - CFNetwork
 - Flash Player
 - QuickDraw Manager
 - SASL
 - WebCore

The remote host is running a version of Mac OS X 10.4.x that is prior to 10.4.8.

Mac OS X 10.4.8 contains several security fixes for the following programs :

 - CFNetwork
 - Flash Player
 - ImageIO
 - Kernel
 - LoginWindow
 - Preferences
 - QuickDraw Manager
 - SASL
 - WebCore
 - Workgroup Manager

Unspecified vulnerability in the CMU Cyrus Simple Authentication and Security Layer (SASL) library, has unknown impact and remote unauthenticated attack vectors, related to DIGEST-MD5 negotiation.

A Denial of Service vulnerability has been discovered in the SASL authentication library when using the DIGEST-MD5 plugin. By sending a specially crafted realm name, a malicious SASL server could exploit this to crash the application that uses SASL.

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-200604-09 (Cyrus-SASL: DIGEST-MD5 Pre-Authentication Denial of Service)

    Cyrus-SASL contains an unspecified vulnerability in the DIGEST-MD5     process that could lead to a Denial of Service.
  Impact :

    An attacker could possibly exploit this vulnerability by sending     specially crafted data stream to the Cyrus-SASL server, resulting in a     Denial of Service even if the attacker is not able to authenticate.
  Workaround :

    There is no known workaround at this time.

ID	Name	Product	Family	Severity
67567	Oracle Linux 3 : cyrus-sasl (ELSA-2007-0878)	Nessus	Oracle Linux Local Security Checks	low
67558	Oracle Linux 4 : cyrus-sasl (ELSA-2007-0795)	Nessus	Oracle Linux Local Security Checks	low
60245	Scientific Linux Security Update : cyrus-sasl on SL4.x, SL3.x i386/x86_64	Nessus	Scientific Linux Local Security Checks	low
40378	VMSA-2008-0009 : Updates to VMware Workstation, VMware Player, VMware ACE, VMware Fusion, VMware Server, VMware VIX API, VMware ESX, VMware ESXi resolve critical security issues	Nessus	VMware ESX Local Security Checks	high
26004	CentOS 4 : cyrus-sasl (CESA-2007:0795)	Nessus	CentOS Local Security Checks	low
25989	RHEL 3 : cyrus-sasl (RHSA-2007:0878)	Nessus	Red Hat Local Security Checks	low
25986	RHEL 4 : cyrus-sasl (RHSA-2007:0795)	Nessus	Red Hat Local Security Checks	low
25973	CentOS 3 : cyrus-sasl (CESA-2007:0878)	Nessus	CentOS Local Security Checks	low
22584	Debian DSA-1042-1 : cyrus-sasl2 - programming error	Nessus	Debian Local Security Checks	low
3757	Mac OS X < 10.4.8 Multiple Vulnerabilities	Nessus Network Monitor	Web Clients	medium
22479	Mac OS X Multiple Vulnerabilities (Security Update 2006-006)	Nessus	MacOS X Local Security Checks	critical
22476	Mac OS X 10.4.x < 10.4.8 Multiple Vulnerabilities	Nessus	MacOS X Local Security Checks	critical
21418	FreeBSD : cyrus-sasl -- DIGEST-MD5 Pre-Authentication Denial of Service (408f6ebf-d152-11da-962f-000b972eb521)	Nessus	FreeBSD Local Security Checks	low
21291	Ubuntu 4.10 / 5.04 / 5.10 : cyrus-sasl2 vulnerability (USN-272-1)	Nessus	Ubuntu Local Security Checks	low
21255	GLSA-200604-09 : Cyrus-SASL: DIGEST-MD5 Pre-Authentication Denial of Service	Nessus	Gentoo Local Security Checks	low

Detections

Analytics

CVE-2006-1721

high

Tenable Plugins

low

low

low

high

low

low

low

low

low

medium

critical

critical

low

low

low