The asn1buf_imbed function in the ASN.1 decoder in MIT Kerberos 5 (aka krb5) 1.6.3, when PK-INIT is used, allows remote attackers to cause a denial of service (application crash) via a crafted length value that triggers an erroneous malloc call, related to incorrect calculations with pointer arithmetic.

The remote NewStart CGSL host, running version MAIN 6.06, has krb5 packages installed that are affected by multiple vulnerabilities:

  - plugins/preauth/pkinit/pkinit_crypto_openssl.c in MIT Kerberos 5 (aka krb5) through 1.15.2 mishandles     Distinguished Name (DN) fields, which allows remote attackers to execute arbitrary code or cause a denial     of service (buffer overflow and application crash) in situations involving untrusted X.509 data, related     to the get_matching_data and X509_NAME_oneline_ex functions. NOTE: this has security relevance only in use     cases outside of the MIT Kerberos distribution, e.g., the use of get_matching_data in KDC certauth plugin     code that is specific to Red Hat. (CVE-2017-15088)

  - The process_chpw_request function in schpw.c in the password-changing functionality in kadmind in MIT     Kerberos 5 (aka krb5) 1.7 through 1.9 frees an invalid pointer, which allows remote attackers to execute     arbitrary code or cause a denial of service (daemon crash) via a crafted request that triggers an error     condition. (CVE-2011-0285)

  - schpw.c in the kpasswd service in kadmind in MIT Kerberos 5 (aka krb5) before 1.11.3 does not properly     validate UDP packets before sending responses, which allows remote attackers to cause a denial of service     (CPU and bandwidth consumption) via a forged packet that triggers a communication loop, as demonstrated by     krb_pingpong.nasl, a related issue to CVE-1999-0103. (CVE-2002-2443)

  - The (1) ftpd and (2) ksu programs in (a) MIT Kerberos 5 (krb5) up to 1.5, and 1.4.x before 1.4.4, and (b)     Heimdal 0.7.2 and earlier, do not check return codes for setuid calls, which might allow local users to     gain privileges by causing setuid to fail to drop privileges. NOTE: as of 20060808, it is not known     whether an exploitable attack scenario exists for these issues. (CVE-2006-3084)

  - The RPC library in Kerberos 5 1.4 through 1.4.4, and 1.5 through 1.5.1, as used in Kerberos administration     daemon (kadmind) and other products that use this library, calls an uninitialized function pointer in     freed memory, which allows remote attackers to cause a denial of service (crash) and possibly execute     arbitrary code via unspecified vectors. (CVE-2006-6143)

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

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

CVE-2009-0844 The get_input_token function in the SPNEGO implementation in MIT Kerberos 5 (aka krb5) 1.5 through 1.6.3 allows remote attackers to cause a denial of service (daemon crash) and possibly obtain sensitive information via a crafted length value that triggers a buffer over-read.

CVE-2009-0845 The spnego_gss_accept_sec_context function in lib/gssapi/spnego/spnego_mech.c in MIT Kerberos 5 (aka krb5) 1.5 through 1.6.3, when SPNEGO is used, allows remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) via invalid ContextFlags data in the reqFlags field in a negTokenInit token.

CVE-2009-0846 The asn1_decode_generaltime function in lib/krb5/asn.1/asn1_decode.c in the ASN.1 GeneralizedTime decoder in MIT Kerberos 5 (aka krb5) before 1.6.4 allows remote attackers to cause a denial of service (daemon crash) or possibly execute arbitrary code via vectors involving an invalid DER encoding that triggers a free of an uninitialized pointer.

  - update to revised patch for (CVE-2009-0844,     CVE-2009-0845)

  - add fix for potential buffer read overrun in the SPNEGO     GSSAPI mechanism (#490635, CVE-2009-0844)

  - add fix for NULL pointer dereference when handling     certain error cases in the SPNEGO GSSAPI mechanism     (#490635, CVE-2009-0845)

  - add fix for attempt to free uninitialized pointer in the     ASN.1 decoder (#490635, CVE-2009-0846)

  - add fix for bug in length validation in the ASN.1     decoder (CVE-2009-0847)

  - add backport of svn patch to fix a bug in how the gssapi     library handles certain error cases in     gss_accept_sec_context (CVE-2009-0845, 

  - add a backported patch which adds a check on credentials     obtained from a foreign realm to make sure that they're     of an acceptable type, and if not, retry to the request     to get one of the right type (Sadique Puthen,

  - backport fix from 1.6.3 to register file-based ccaches     created with the krb5_cc_new_unique function with the     global list, so that we don't crash when we go to close     the ccache (#468729)

From Red Hat Security Advisory 2009:0410 :

Updated krb5 packages that fix a security issue are now available for Red Hat Enterprise Linux 2.1 and 3.

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).

An input validation flaw was found in the ASN.1 (Abstract Syntax Notation One) decoder used by MIT Kerberos. A remote attacker could use this flaw to crash a network service using the MIT Kerberos library, such as kadmind or krb5kdc, by causing it to dereference or free an uninitialized pointer or, possibly, execute arbitrary code with the privileges of the user running the service. (CVE-2009-0846)

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

From Red Hat Security Advisory 2009:0409 :

Updated krb5 packages that fix a security issue are now available for Red Hat Enterprise Linux 4.

This update has been rated as having important 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).

An input validation flaw was found in the ASN.1 (Abstract Syntax Notation One) decoder used by MIT Kerberos. A remote attacker could use this flaw to crash a network service using the MIT Kerberos library, such as kadmind or krb5kdc, by causing it to dereference or free an uninitialized pointer. (CVE-2009-0846)

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

Updated krb5 packages that fix a security issue are now available for Red Hat Enterprise Linux 4.

This update has been rated as having important 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).

An input validation flaw was found in the ASN.1 (Abstract Syntax Notation One) decoder used by MIT Kerberos. A remote attacker could use this flaw to crash a network service using the MIT Kerberos library, such as kadmind or krb5kdc, by causing it to dereference or free an uninitialized pointer. (CVE-2009-0846)

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

Updated krb5 packages that fix various security issues are now available for Red Hat Enterprise Linux 5.

This update has been rated as having important 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). The Generic Security Service Application Program Interface (GSS-API) definition provides security services to callers (protocols) in a generic fashion. The Simple and Protected GSS-API Negotiation (SPNEGO) mechanism is used by GSS-API peers to choose from a common set of security mechanisms.

An input validation flaw was found in the ASN.1 (Abstract Syntax Notation One) decoder used by MIT Kerberos. A remote attacker could use this flaw to crash a network service using the MIT Kerberos library, such as kadmind or krb5kdc, by causing it to dereference or free an uninitialized pointer. (CVE-2009-0846)

Multiple input validation flaws were found in the MIT Kerberos GSS-API library's implementation of the SPNEGO mechanism. A remote attacker could use these flaws to crash any network service utilizing the MIT Kerberos GSS-API library to authenticate users or, possibly, leak portions of the service's memory. (CVE-2009-0844, CVE-2009-0845)

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

s700_800 11.11 KRB5-Client Version 1.0 cumulative patch : 

Potential security vulnerabilities have been identified on HP-UX running Kerberos. These vulnerabilities could be exploited by remote unauthenticated users to create a Denial of Service (DoS) or to execute arbitrary code.

s700_800 11.31 KRB5-Client Version 1.3.5.03 Cumulative patch : 

Potential security vulnerabilities have been identified on HP-UX running Kerberos. These vulnerabilities could be exploited by remote unauthenticated users to create a Denial of Service (DoS) or to execute arbitrary code.

s700_800 11.23 KRB5-Client Version 1.0 Cumulative patch : 

Potential security vulnerabilities have been identified on HP-UX running Kerberos. These vulnerabilities could be exploited by remote unauthenticated users to create a Denial of Service (DoS) or to execute arbitrary code.

Clients sending negotiation requests with invalid flags could crash the kerberos server. (CVE-2009-0845)

GSS-API clients could crash when reading from an invalid address space. (CVE-2009-0844)

Invalid length checks could crash applications using the kerberos ASN.1 parser. (CVE-2009-0847)

Under certain circumstances the ASN.1 parser could free an uninitialized pointer which could crash a kerberos server or even lead to execution of arbitrary code. (CVE-2009-0846)

Clients sending negotiation requests with invalid flags could crash the kerberos server (CVE-2009-0845).

GSS-API clients could crash when reading from an invalid address space (CVE-2009-0844).

Invalid length checks could crash applications using the kerberos ASN.1 parser (CVE-2009-0847).

Under certain circumstances the ASN.1 parser could free an uninitialized pointer which could crash a kerberos server or even lead to execution of arbitrary code (CVE-2009-0846).

The remote host is running a version of Mac OS X 10.5.x that is prior to 10.5.7. 

Mac OS X 10.5.7 contains security fixes for the following products :

  - Apache
  - ATS
  - BIND
  - CFNetwork
  - CoreGraphics
  - Cscope
  - CUPS
  - Disk Images
  - enscript
  - Flash Player plug-in
  - Help Viewer
  - iChat
  - International Components for Unicode
  - IPSec
  - Kerberos
  - Kernel
  - Launch Services
  - libxml
  - Net-SNMP
  - Network Time
  - Networking
  - OpenSSL
  - PHP
  - QuickDraw Manager
  - ruby
  - Safari
  - Spotlight
  - system_cmds
  - telnet
  - Terminal
  - WebKit
  - X11

The remote host is running a version of Mac OS X 10.4 that does not have Security Update 2009-002 applied.

This security update contains fixes for the following products :

  - Apache
  - ATS
  - BIND
  - CoreGraphics
  - Cscope
  - CUPS
  - Disk Images
  - enscript
  - Flash Player plug-in
  - Help Viewer
  - IPSec
  - Kerberos
  - Launch Services
  - libxml
  - Net-SNMP
  - Network Time
  - OpenSSL
  - QuickDraw Manager
  - Spotlight
  - system_cmds
  - telnet
  - Terminal
  - X11

Multiple vulnerabilities has been found and corrected in krb5 :

The get_input_token function in the SPNEGO implementation in MIT Kerberos 5 (aka krb5) 1.5 through 1.6.3 allows remote attackers to cause a denial of service (daemon crash) and possibly obtain sensitive information via a crafted length value that triggers a buffer over-read (CVE-2009-0844).

The spnego_gss_accept_sec_context function in lib/gssapi/spnego/spnego_mech.c in MIT Kerberos 5 (aka krb5) 1.5 through 1.6.3, when SPNEGO is used, allows remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) via invalid ContextFlags data in the reqFlags field in a negTokenInit token (CVE-2009-0845).

The asn1_decode_generaltime function in lib/krb5/asn.1/asn1_decode.c in the ASN.1 GeneralizedTime decoder in MIT Kerberos 5 (aka krb5) before 1.6.4 allows remote attackers to cause a denial of service (daemon crash) or possibly execute arbitrary code via vectors involving an invalid DER encoding that triggers a free of an uninitialized pointer (CVE-2009-0846).

The asn1buf_imbed function in the ASN.1 decoder in MIT Kerberos 5 (aka krb5) 1.6.3, when PK-INIT is used, allows remote attackers to cause a denial of service (application crash) via a crafted length value that triggers an erroneous malloc call, related to incorrect calculations with pointer arithmetic (CVE-2009-0847).

The updated packages have been patched to correct these issues.

Update :

Packages for 2008.0 are provided for Corporate Desktop 2008.0 customers

Multiple flaws were discovered in the Kerberos GSS-API and ASN.1 routines that did not correctly handle certain requests. An unauthenticated remote attacker could send specially crafted traffic to crash services using the Kerberos library, leading to a denial of service.

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.

This update incorporates patches to fix potential read overflow and NULL pointer dereferences in the implementation of the SPNEGO GSSAPI mechanism (CVE-2009-0844, CVE-2009-0845), attempts to free an uninitialized pointer during protocol parsing (CVE-2009-0846), and a bug in length validation during protocol parsing (CVE-2009-0847).

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.

The remote host is affected by the vulnerability described in GLSA-200904-09 (MIT Kerberos 5: Multiple vulnerabilities)

    Multiple vulnerabilities have been reported in MIT Kerberos 5:
    A free() call on an uninitialized pointer in the ASN.1 decoder     when decoding an invalid encoding (CVE-2009-0846).
    A buffer     overread in the SPNEGO GSS-API application, reported by Apple Product     Security (CVE-2009-0844).
    A NULL pointer dereference in the     SPNEGO GSS-API application, reported by Richard Evans     (CVE-2009-0845).
    An incorrect length check inside an ASN.1     decoder leading to spurious malloc() failures (CVE-2009-0847).
  Impact :

    A remote unauthenticated attacker could exploit the first vulnerability     to cause a Denial of Service or, in unlikely circumstances, execute     arbitrary code on the host running krb5kdc or kadmind with root     privileges and compromise the Kerberos key database. Exploitation of     the other vulnerabilities might lead to a Denial of Service in kadmind,     krb5kdc, or other daemons performing authorization against Kerberos     that utilize GSS-API or an information disclosure.
  Workaround :

    There is no known workaround at this time.

Several vulnerabilities have been found in the MIT reference implementation of Kerberos V5, a system for authenticating users and services on a network. The Common Vulnerabilities and Exposures project identified the following problems :

  - CVE-2009-0844     The Apple Product Security team discovered that the     SPNEGO GSS-API mechanism suffers of a missing bounds     check when reading a network input buffer which results     in an invalid read crashing the application or possibly     leaking information.

  - CVE-2009-0845     Under certain conditions the SPNEGO GSS-API mechanism     references a NULL pointer which crashes the application     using the library.

  - CVE-2009-0847     An incorrect length check inside the ASN.1 decoder of     the MIT krb5 implementation allows an unauthenticated     remote attacker to crash of the kinit or KDC program.

  - CVE-2009-0846     Under certain conditions the the ASN.1 decoder of the     MIT krb5 implementation frees an uninitialized pointer     which could lead to denial of service and possibly     arbitrary code execution.

Updated krb5 packages that fix a security issue are now available for Red Hat Enterprise Linux 2.1 and 3.

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).

An input validation flaw was found in the ASN.1 (Abstract Syntax Notation One) decoder used by MIT Kerberos. A remote attacker could use this flaw to crash a network service using the MIT Kerberos library, such as kadmind or krb5kdc, by causing it to dereference or free an uninitialized pointer or, possibly, execute arbitrary code with the privileges of the user running the service. (CVE-2009-0846)

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

The remote host is running a version of Mac OS X 10.5 that is older than version 10.5.7.  Mac OS X 10.5.7 contains security fixes for the following products : 

- Apache
- ATS
- BIND
- CFNetwork
- CoreGraphics
-Cscope
- CUPS
- Disk Images
- enscript
- Flash player
- Help Viewer
- iChat
- Internation Components for Unicode
- IPSec
- Kerberos
- Kernel
- Launch Services
- libxml
- Net-SNMP
- Network Time
- Networking
- OpenSSL
- PHP
- QuickDraw Manager
- ruby
- Safari
- Spotlight
- system_cmds
- telnet
- WebKit
- X11
- Terminal

ID	Name	Product	Family	Severity
266225	NewStart CGSL MAIN 6.06 : krb5 Multiple Vulnerabilities (NS-SA-2025-0215)	Nessus	NewStart CGSL Local Security Checks	critical
79452	OracleVM 2.1 : krb5 (OVMSA-2009-0003)	Nessus	OracleVM Local Security Checks	critical
67838	Oracle Linux 3 : krb5 (ELSA-2009-0410)	Nessus	Oracle Linux Local Security Checks	critical
67837	Oracle Linux 4 : krb5 (ELSA-2009-0409)	Nessus	Oracle Linux Local Security Checks	critical
43740	CentOS 4 : krb5 (CESA-2009:0409)	Nessus	CentOS Local Security Checks	critical
43739	CentOS 5 : krb5 (CESA-2009:0408)	Nessus	CentOS Local Security Checks	critical
41978	HP-UX PHSS_39774 : HP-UX Running Kerberos, Remote Denial of Service (DoS), Execution of Arbitrary Code (HPSBUX02421 SSRT090047 rev.2)	Nessus	HP-UX Local Security Checks	critical
41977	HP-UX PHSS_39766 : HP-UX Running Kerberos, Remote Denial of Service (DoS), Execution of Arbitrary Code (HPSBUX02421 SSRT090047 rev.2)	Nessus	HP-UX Local Security Checks	critical
41976	HP-UX PHSS_39765 : HP-UX Running Kerberos, Remote Denial of Service (DoS), Execution of Arbitrary Code (HPSBUX02421 SSRT090047 rev.2)	Nessus	HP-UX Local Security Checks	critical
41542	SuSE 10 Security Update : Kerberos (ZYPP Patch Number 6140)	Nessus	SuSE Local Security Checks	critical
41415	SuSE 11 Security Update : Kerberos (SAT Patch Number 738)	Nessus	SuSE Local Security Checks	critical
40253	openSUSE Security Update : krb5 (krb5-740)	Nessus	SuSE Local Security Checks	critical
40017	openSUSE Security Update : krb5 (krb5-740)	Nessus	SuSE Local Security Checks	critical
38744	Mac OS X 10.5.x < 10.5.7 Multiple Vulnerabilities	Nessus	MacOS X Local Security Checks	critical
38743	Mac OS X Multiple Vulnerabilities (Security Update 2009-002)	Nessus	MacOS X Local Security Checks	critical
38191	Mandriva Linux Security Advisory : krb5 (MDVSA-2009:098-1)	Nessus	Mandriva Local Security Checks	critical
37819	Ubuntu 6.06 LTS / 7.10 / 8.04 LTS / 8.10 : krb5 vulnerabilities (USN-755-1)	Nessus	Ubuntu Local Security Checks	critical
36660	Fedora 10 : krb5-1.6.3-18.fc10 (2009-2852)	Nessus	Fedora Local Security Checks	critical
36137	GLSA-200904-09 : MIT Kerberos 5: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	critical
36122	openSUSE 10 Security Update : krb5 (krb5-6139)	Nessus	SuSE Local Security Checks	critical
36120	Debian DSA-1766-1 : krb5 - several vulnerabilities	Nessus	Debian Local Security Checks	critical
36114	RHEL 2.1 / 3 : krb5 (RHSA-2009:0410)	Nessus	Red Hat Local Security Checks	critical
36108	Fedora 9 : krb5-1.6.3-16.fc9 (2009-2834)	Nessus	Fedora Local Security Checks	critical
36107	CentOS 3 : krb5 (CESA-2009:0410)	Nessus	CentOS Local Security Checks	critical
5023	Mac OS X 10.5 < 10.5.7 Multiple Vulnerabilities	Nessus Network Monitor	Generic	critical

Detections

Analytics

CVE-2009-0847

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Tenable Plugins

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