Updated krb5 packages that fix multiple security issues, several bugs, and add various enhancements are now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having Moderate security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section.

Kerberos is a networked authentication system which allows clients and servers to authenticate to each other with the help of a trusted third party, the Kerberos KDC.

A NULL pointer dereference flaw was found in the MIT Kerberos SPNEGO acceptor for continuation tokens. A remote, unauthenticated attacker could use this flaw to crash a GSSAPI-enabled server application.
(CVE-2014-4344)

A buffer overflow was found in the KADM5 administration server (kadmind) when it was used with an LDAP back end for the KDC database.
A remote, authenticated attacker could potentially use this flaw to execute arbitrary code on the system running kadmind. (CVE-2014-4345)

A use-after-free flaw was found in the way the MIT Kerberos libgssapi_krb5 library processed valid context deletion tokens. An attacker able to make an application using the GSS-API library (libgssapi) call the gss_process_context_token() function could use this flaw to crash that application. (CVE-2014-5352)

If kadmind were used with an LDAP back end for the KDC database, a remote, authenticated attacker with the permissions to set the password policy could crash kadmind by attempting to use a named ticket policy object as a password policy for a principal.
(CVE-2014-5353)

A double-free flaw was found in the way MIT Kerberos handled invalid External Data Representation (XDR) data. An authenticated user could use this flaw to crash the MIT Kerberos administration server (kadmind), or other applications using Kerberos libraries, using specially crafted XDR packets. (CVE-2014-9421)

It was found that the MIT Kerberos administration server (kadmind) incorrectly accepted certain authentication requests for two-component server principal names. A remote attacker able to acquire a key with a particularly named principal (such as 'kad/x') could use this flaw to impersonate any user to kadmind, and perform administrative actions as that user. (CVE-2014-9422)

An information disclosure flaw was found in the way MIT Kerberos RPCSEC_GSS implementation (libgssrpc) handled certain requests. An attacker could send a specially crafted request to an application using libgssrpc to disclose a limited portion of uninitialized memory used by that application. (CVE-2014-9423)

Two buffer over-read flaws were found in the way MIT Kerberos handled certain requests. A remote, unauthenticated attacker able to inject packets into a client or server application's GSSAPI session could use either of these flaws to crash the application. (CVE-2014-4341, CVE-2014-4342)

A double-free flaw was found in the MIT Kerberos SPNEGO initiators. An attacker able to spoof packets to appear as though they are from an GSSAPI acceptor could use this flaw to crash a client application that uses MIT Kerberos. (CVE-2014-4343)

Red Hat would like to thank the MIT Kerberos project for reporting the CVE-2014-5352, CVE-2014-9421, CVE-2014-9422, and CVE-2014-9423 issues.
MIT Kerberos project acknowledges Nico Williams for helping with the analysis of CVE-2014-5352.

The krb5 packages have been upgraded to upstream version 1.12, which provides a number of bug fixes and enhancements, including :

* Added plug-in interfaces for principal-to-username mapping and verifying authorization to user accounts.

* When communicating with a KDC over a connected TCP or HTTPS socket, the client gives the KDC more time to reply before it transmits the request to another server. (BZ#1049709, BZ#1127995)

This update also fixes multiple bugs, for example :

* The Kerberos client library did not recognize certain exit statuses that the resolver libraries could return when looking up the addresses of servers configured in the /etc/krb5.conf file or locating Kerberos servers using DNS service location. The library could treat non-fatal return codes as fatal errors. Now, the library interprets the specific return codes correctly. (BZ#1084068, BZ#1109102)

In addition, this update adds various enhancements. Among others :

* Added support for contacting KDCs and kpasswd servers through HTTPS proxies implementing the Kerberos KDC Proxy (KKDCP) protocol.
(BZ#1109919)

The remote Oracle Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2015-0439 advisory.

    - fix for CVE-2014-5352 (#1179856) 'gss_process_context_token()       incorrectly frees context (MITKRB5-SA-2015-001)'
    - fix for CVE-2014-9421 (#1179857) 'kadmind doubly frees partial       deserialization results (MITKRB5-SA-2015-001)'
    - fix for CVE-2014-9422 (#1179861) 'kadmind incorrectly       validates server principal name (MITKRB5-SA-2015-001)'
    - fix for CVE-2014-9423 (#1179863) 'libgssrpc server applications       leak uninitialized bytes (MITKRB5-SA-2015-001)'
    - fix for CVE-2014-5354 (#1174546) 'krb5: NULL pointer       dereference when using keyless entries'
    - fix for CVE-2014-5353 (#1174543) 'Fix LDAP misused policy       name crash'
    - update to 1.12.2
      - drop patch for RT#7820, fixed in 1.12.2
      - drop patch for #231147, fixed as RT#3277 in 1.12.2
      - drop patch for RT#7818, fixed in 1.12.2
      - drop patch for RT#7836, fixed in 1.12.2
      - drop patch for RT#7858, fixed in 1.12.2
      - drop patch for RT#7924, fixed in 1.12.2
      - drop patch for RT#7926, fixed in 1.12.2
      - drop patches for CVE-2014-4341/CVE-2014-4342, included in 1.12.2
      - drop patch for CVE-2014-4343, included in 1.12.2
      - drop patch for CVE-2014-4344, included in 1.12.2
      - drop patch for CVE-2014-4345, included in 1.12.2
    - incorporate fix for MITKRB5-SA-2014-001 (CVE-2014-4345)
    - gssapi: pull in upstream fix for a possible NULL dereference       in spnego (CVE-2014-4344)
    - gssapi: pull in proposed fix for a double free in initiators (David       Woodhouse, CVE-2014-4343, #1117963)
    - pull in fix for denial of service by injection of malformed GSSAPI tokens       (CVE-2014-4341, CVE-2014-4342, #1116181)

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

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

The remote NewStart CGSL host, running version MAIN 6.06 (SP), 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 MiracleLinux 4 host has packages installed that are affected by multiple vulnerabilities as referenced in the AXSA:2014-606:02 advisory.

    Description :
    Kerberos V5 is a trusted-third-party network authentication system,     which can improve your network's security by eliminating the insecure     practice of sending passwords over the network in unencrypted form.
    Security issues fixed with this release:
    CVE-2013-1418     The setup_server_realm function in main.c in the Key Distribution Center (KDC) in MIT Kerberos 5 (aka     krb5) before 1.10.7, when multiple realms are configured, allows remote attackers to cause a denial of     service (NULL pointer dereference and daemon crash) via a crafted request.
    CVE-2013-6800     An unspecified third-party database module for the Key Distribution Center (KDC) in MIT Kerberos 5 (aka     krb5) 1.10.x allows remote authenticated users to cause a denial of service (NULL pointer dereference and     daemon crash) via a crafted request, a different vulnerability than CVE-2013-1418.
    CVE-2014-4341     MIT Kerberos 5 (aka krb5) before 1.12.2 allows remote attackers to cause a denial of service (buffer over-     read and application crash) by injecting invalid tokens into a GSSAPI application session.
    CVE-2014-4342     MIT Kerberos 5 (aka krb5) 1.7.x through 1.12.x before 1.12.2 allows remote attackers to cause a denial of     service (buffer over-read or NULL pointer dereference, and application crash) by injecting invalid tokens     into a GSSAPI application session.
    CVE-2014-4343     Double free vulnerability in the init_ctx_reselect function in the SPNEGO initiator in     lib/gssapi/spnego/spnego_mech.c in MIT Kerberos 5 (aka krb5) 1.10.x through 1.12.x before 1.12.2 allows     remote attackers to cause a denial of service (memory corruption) or possibly execute arbitrary code via     network traffic that appears to come from an intended acceptor, but specifies a security mechanism     different from the one proposed by the initiator.
    CVE-2014-4344     The acc_ctx_cont function in the SPNEGO acceptor in lib/gssapi/spnego/spnego_mech.c in MIT Kerberos 5 (aka     krb5) 1.5.x through 1.12.x before 1.12.2 allows remote attackers to cause a denial of service (NULL     pointer dereference and application crash) via an empty continuation token at a certain point during a     SPNEGO negotiation.
    CVE-2014-4345     Off-by-one error in the krb5_encode_krbsecretkey function in     plugins/kdb/ldap/libkdb_ldap/ldap_principal2.c in the LDAP KDB module in kadmind in MIT Kerberos 5 (aka     krb5) 1.6.x through 1.11.x before 1.11.6 and 1.12.x before 1.12.2 allows remote authenticated users to     cause a denial of service (buffer overflow) or possibly execute arbitrary code via a series of cpw
    -keepold commands.
    Fixed bugs;
    These updated krb5 packages also include several bug fixes.
    Please see changelog for more information.

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

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

The following security isses are fixed in this update :

CVE-2014-4341 CVE-2014-4342: denial of service flaws when handling RFC 1964 tokens (bnc#886016)

CVE-2014-4343 CVE-2014-4344: multiple flaws in SPNEGO (bnc#888697)

The remote Oracle Linux 5 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2014-1245 advisory.

    - gssapi: pull in upstream fix for a possible NULL dereference in spnego       (CVE-2014-4344, #1121509)
    - fix what appears to be a cosmetic error in the patch for self-tests       for CVE-2014-4341
    - run the backported self-tests, such as they are, for CVE-2014-4341
    - pull in backported fix for denial of service by injection of malformed       GSSAPI tokens (CVE-2014-4341, #1121509)
    - incorporate backported upstream patch for remote crash of KDCs which serve       multiple realms simultaneously (RT#7756, CVE-2013-1418/CVE-2013-6800,

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

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

Updated krb5 packages that fix multiple security issues and several bugs are now available for Red Hat Enterprise Linux 6.

Red Hat Product Security has rated this update as having Moderate security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section.

Kerberos is a networked authentication system which allows clients and servers to authenticate to each other with the help of a trusted third party, the Kerberos KDC.

It was found that if a KDC served multiple realms, certain requests could cause the setup_server_realm() function to dereference a NULL pointer. A remote, unauthenticated attacker could use this flaw to crash the KDC using a specially crafted request. (CVE-2013-1418, CVE-2013-6800)

A NULL pointer dereference flaw was found in the MIT Kerberos SPNEGO acceptor for continuation tokens. A remote, unauthenticated attacker could use this flaw to crash a GSSAPI-enabled server application.
(CVE-2014-4344)

A buffer overflow was found in the KADM5 administration server (kadmind) when it was used with an LDAP back end for the KDC database.
A remote, authenticated attacker could potentially use this flaw to execute arbitrary code on the system running kadmind. (CVE-2014-4345)

Two buffer over-read flaws were found in the way MIT Kerberos handled certain requests. A remote, unauthenticated attacker who is able to inject packets into a client or server application's GSSAPI session could use either of these flaws to crash the application.
(CVE-2014-4341, CVE-2014-4342)

A double-free flaw was found in the MIT Kerberos SPNEGO initiators. An attacker able to spoof packets to appear as though they are from an GSSAPI acceptor could use this flaw to crash a client application that uses MIT Kerberos. (CVE-2014-4343)

These updated krb5 packages also include several bug fixes. Space precludes documenting all of these changes in this advisory. Users are directed to the Red Hat Enterprise Linux 6.6 Technical Notes, linked to in the References section, for information on the most significant of these changes.

All krb5 users are advised to upgrade to these updated packages, which contain backported patches to correct these issues.

It was found that if a KDC served multiple realms, certain requests could cause the setup_server_realm() function to dereference a NULL pointer. A remote, unauthenticated attacker could use this flaw to crash the KDC using a specially crafted request. (CVE-2013-1418, CVE-2013-6800)

A NULL pointer dereference flaw was found in the MIT Kerberos SPNEGO acceptor for continuation tokens. A remote, unauthenticated attacker could use this flaw to crash a GSSAPI-enabled server application.
(CVE-2014-4344)

A buffer over-read flaw was found in the way MIT Kerberos handled certain requests. A man-in-the-middle attacker with a valid Kerberos ticket who is able to inject packets into a client or server application's GSSAPI session could use this flaw to crash the application. (CVE-2014-4341)

This update also fixes the following bugs :

  - Prior to this update, the libkrb5 library occasionally     attempted to free already freed memory when encrypting     credentials. As a consequence, the calling process     terminated unexpectedly with a segmentation fault. With     this update, libkrb5 frees memory correctly, which     allows the credentials to be encrypted appropriately and     thus prevents the mentioned crash.

  - Previously, when the krb5 client library was waiting for     a response from a server, the timeout variable in     certain cases became a negative number. Consequently,     the client could enter a loop while checking for     responses. With this update, the client logic has been     modified and the described error no longer occurs.

After installing the updated packages, the krb5kdc daemon will be restarted automatically.

It was found that if a KDC served multiple realms, certain requests could cause the setup_server_realm() function to dereference a NULL pointer. A remote, unauthenticated attacker could use this flaw to crash the KDC using a specially crafted request. (CVE-2013-1418, CVE-2013-6800)

A NULL pointer dereference flaw was found in the MIT Kerberos SPNEGO acceptor for continuation tokens. A remote, unauthenticated attacker could use this flaw to crash a GSSAPI-enabled server application.
(CVE-2014-4344)

A buffer overflow was found in the KADM5 administration server (kadmind) when it was used with an LDAP back end for the KDC database.
A remote, authenticated attacker could potentially use this flaw to execute arbitrary code on the system running kadmind. (CVE-2014-4345)

Two buffer over-read flaws were found in the way MIT Kerberos handled certain requests. A remote, unauthenticated attacker who is able to inject packets into a client or server application's GSSAPI session could use either of these flaws to crash the application.
(CVE-2014-4341, CVE-2014-4342)

A double-free flaw was found in the MIT Kerberos SPNEGO initiators. An attacker able to spoof packets to appear as though they are from an GSSAPI acceptor could use this flaw to crash a client application that uses MIT Kerberos. (CVE-2014-4343)

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

  - actually apply that last patch

  - incorporate fix for MITKRB5-SA-2014-001 (CVE-2014-4345,     #1128157)

  - ksu: when evaluating .k5users, don't throw away data     from .k5users when we're not passed a command to run,     which implicitly means we're attempting to run the     target user's shell (#1026721, revised)

  - ksu: when evaluating .k5users, treat lines with just a     principal name as if they contained the principal name     followed by '*', and don't throw away data from .k5users     when we're not passed a command to run, which implicitly     means we're attempting to run the target user's shell     (#1026721, revised)

  - gssapi: pull in upstream fix for a possible NULL     dereference in spnego (CVE-2014-4344, #1121510)

  - gssapi: pull in proposed-and-accepted fix for a double     free in initiators (David Woodhouse, CVE-2014-4343,     #1121510)

  - correct a type mistake in the backported fix for     (CVE-2013-1418, CVE-2013-6800)

  - pull in backported fix for denial of service by     injection of malformed GSSAPI tokens (CVE-2014-4341,     CVE-2014-4342, #1121510)

  - incorporate backported patch for remote crash of KDCs     which serve multiple realms simultaneously (RT#7756,     CVE-2013-1418/CVE-2013-6800, more of

  - pull in backport of patch to not subsequently always     require that responses come from master KDCs if we get     one from a master somewhere along the way while chasing     referrals (RT#7650, #1113652)

  - ksu: if the -e flag isn't used, use the target user's     shell when checking for authorization via the target     user's .k5users file (#1026721)

  - define _GNU_SOURCE in files where we use EAI_NODATA, to     make sure that it's declared (#1059730)

  - spnego: pull in patch from master to restore preserving     the OID of the mechanism the initiator requested when we     have multiple OIDs for the same mechanism, so that we     reply using the same mechanism OID and the initiator     doesn't get confused (#1087068, RT#7858)

  - add patch from Jatin Nansi to avoid attempting to clear     memory at the NULL address if krb5_encrypt_helper     returns an error when called from encrypt_credencpart     (#1055329, pull #158)

  - drop patch to add additional access checks to ksu - they     shouldn't be resulting in any benefit

  - apply patch from Nikolai Kondrashov to pass a default     realm set in /etc/sysconfig/krb5kdc to the     kdb_check_weak helper, so that it doesn't produce an     error if there isn't one set in krb5.conf (#1009389)

  - packaging: don't Obsoletes: older versions of     krb5-pkinit-openssl and virtual Provide:
    krb5-pkinit-openssl on EL6, where we don't need to     bother with any of that (#1001961)

  - pkinit: backport tweaks to avoid trying to call the     prompter callback when one isn't set (part of #965721)

  - pkinit: backport the ability to use a prompter callback     to prompt for a password when reading private keys (the     rest of #965721)

  - backport fix to not spin on a short read when reading     the length of a response over TCP (RT#7508, #922884)

  - backport fix for trying all compatible keys when not     being strict about acceptor names while reading AP-REQs     (RT#7883, #1070244)

  - backport fix for not being able to verify the list of     transited realms in GSS acceptors (RT#7639, #959685)

  - pull fix for keeping track of the message type when     parsing FAST requests in the KDC (RT#7605, #951965)

  - incorporate upstream patch to fix a NULL pointer     dereference while processing certain TGS requests     (CVE-2013-1416, #950343)

  - incorporate upstream patch to fix a NULL pointer     dereference when the client supplies an     otherwise-normal-looking PKINIT request (CVE-2013-1415,     #917910)

  - add patch to avoid dereferencing a NULL pointer in the     KDC when handling a draft9 PKINIT request (#917910,     CVE-2012-1016)

  - pull up fix for UDP ping-pong flaw in kpasswd service     (CVE-2002-2443, 

  - don't leak the memory used to hold the previous entry     when walking a keytab to figure out which kinds of keys     we have (#911147)

ID	Name	Product	Family	Published	Updated	Severity
81637	RHEL 7 : krb5 (RHSA-2015:0439)	Nessus	Red Hat Local Security Checks	3/5/2015	10/24/2019	high
81805	Oracle Linux 7 : krb5 (ELSA-2015-0439)	Nessus	Oracle Linux Local Security Checks	3/13/2015	11/1/2024	critical
301200	NewStart CGSL MAIN 6.06 (SP) : krb5 Multiple Vulnerabilities (NS-SA-2026-0007)	Nessus	NewStart CGSL Local Security Checks	3/6/2026	3/9/2026	critical
289469	MiracleLinux 4 : krb5-1.10.3-33.AXS4 (AXSA:2014-606:02)	Nessus	Miracle Linux Local Security Checks	1/16/2026	1/16/2026	critical
77130	openSUSE Security Update : krb5 (openSUSE-SU-2014:0977-1)	Nessus	SuSE Local Security Checks	8/12/2014	1/19/2021	high
77738	Oracle Linux 5 : krb5 (ELSA-2014-1245)	Nessus	Oracle Linux Local Security Checks	9/18/2014	4/29/2025	high
78406	RHEL 6 : krb5 (RHSA-2014:1389)	Nessus	Red Hat Local Security Checks	10/14/2014	1/14/2021	high
78418	Scientific Linux Security Update : krb5 on SL5.x i386/x86_64 (20140916)	Nessus	Scientific Linux Local Security Checks	10/14/2014	1/14/2021	high
78846	Scientific Linux Security Update : krb5 on SL6.x i386/x86_64 (20141014)	Nessus	Scientific Linux Local Security Checks	11/4/2014	1/14/2021	high
79549	OracleVM 3.3 : krb5 (OVMSA-2014-0034)	Nessus	OracleVM Local Security Checks	11/26/2014	1/4/2021	high

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