Red Hat: 2015:0439-01: krb5: Moderate Advisory
Summary
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 serversusing 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)
Summary
Solution
All krb5 users are advised to upgrade to these updated packages, which
correct these issues and add these enhancements.
Before applying this update, make sure all previously released errata
relevant to your system have been applied.
For details on how to apply this update, refer to:
https://access.redhat.com/articles/11258
References
https://access.redhat.com/security/cve/CVE-2014-4341 https://access.redhat.com/security/cve/CVE-2014-4342 https://access.redhat.com/security/cve/CVE-2014-4343 https://access.redhat.com/security/cve/CVE-2014-4344 https://access.redhat.com/security/cve/CVE-2014-4345 https://access.redhat.com/security/cve/CVE-2014-5352 https://access.redhat.com/security/cve/CVE-2014-5353 https://access.redhat.com/security/cve/CVE-2014-9421 https://access.redhat.com/security/cve/CVE-2014-9422 https://access.redhat.com/security/cve/CVE-2014-9423 https://access.redhat.com/security/updates/classification/#moderate
Package List
Red Hat Enterprise Linux Client (v. 7):
Source:
krb5-1.12.2-14.el7.src.rpm
x86_64:
krb5-debuginfo-1.12.2-14.el7.i686.rpm
krb5-debuginfo-1.12.2-14.el7.x86_64.rpm
krb5-libs-1.12.2-14.el7.i686.rpm
krb5-libs-1.12.2-14.el7.x86_64.rpm
krb5-pkinit-1.12.2-14.el7.x86_64.rpm
krb5-workstation-1.12.2-14.el7.x86_64.rpm
Red Hat Enterprise Linux Client Optional (v. 7):
x86_64:
krb5-debuginfo-1.12.2-14.el7.i686.rpm
krb5-debuginfo-1.12.2-14.el7.x86_64.rpm
krb5-devel-1.12.2-14.el7.i686.rpm
krb5-devel-1.12.2-14.el7.x86_64.rpm
krb5-server-1.12.2-14.el7.x86_64.rpm
krb5-server-ldap-1.12.2-14.el7.x86_64.rpm
Red Hat Enterprise Linux ComputeNode (v. 7):
Source:
krb5-1.12.2-14.el7.src.rpm
x86_64:
krb5-debuginfo-1.12.2-14.el7.i686.rpm
krb5-debuginfo-1.12.2-14.el7.x86_64.rpm
krb5-libs-1.12.2-14.el7.i686.rpm
krb5-libs-1.12.2-14.el7.x86_64.rpm
krb5-pkinit-1.12.2-14.el7.x86_64.rpm
krb5-workstation-1.12.2-14.el7.x86_64.rpm
Red Hat Enterprise Linux ComputeNode Optional (v. 7):
x86_64:
krb5-debuginfo-1.12.2-14.el7.i686.rpm
krb5-debuginfo-1.12.2-14.el7.x86_64.rpm
krb5-devel-1.12.2-14.el7.i686.rpm
krb5-devel-1.12.2-14.el7.x86_64.rpm
krb5-server-1.12.2-14.el7.x86_64.rpm
krb5-server-ldap-1.12.2-14.el7.x86_64.rpm
Red Hat Enterprise Linux Server (v. 7):
Source:
krb5-1.12.2-14.el7.src.rpm
ppc64:
krb5-debuginfo-1.12.2-14.el7.ppc.rpm
krb5-debuginfo-1.12.2-14.el7.ppc64.rpm
krb5-devel-1.12.2-14.el7.ppc.rpm
krb5-devel-1.12.2-14.el7.ppc64.rpm
krb5-libs-1.12.2-14.el7.ppc.rpm
krb5-libs-1.12.2-14.el7.ppc64.rpm
krb5-pkinit-1.12.2-14.el7.ppc64.rpm
krb5-server-1.12.2-14.el7.ppc64.rpm
krb5-server-ldap-1.12.2-14.el7.ppc64.rpm
krb5-workstation-1.12.2-14.el7.ppc64.rpm
s390x:
krb5-debuginfo-1.12.2-14.el7.s390.rpm
krb5-debuginfo-1.12.2-14.el7.s390x.rpm
krb5-devel-1.12.2-14.el7.s390.rpm
krb5-devel-1.12.2-14.el7.s390x.rpm
krb5-libs-1.12.2-14.el7.s390.rpm
krb5-libs-1.12.2-14.el7.s390x.rpm
krb5-pkinit-1.12.2-14.el7.s390x.rpm
krb5-server-1.12.2-14.el7.s390x.rpm
krb5-server-ldap-1.12.2-14.el7.s390x.rpm
krb5-workstation-1.12.2-14.el7.s390x.rpm
x86_64:
krb5-debuginfo-1.12.2-14.el7.i686.rpm
krb5-debuginfo-1.12.2-14.el7.x86_64.rpm
krb5-devel-1.12.2-14.el7.i686.rpm
krb5-devel-1.12.2-14.el7.x86_64.rpm
krb5-libs-1.12.2-14.el7.i686.rpm
krb5-libs-1.12.2-14.el7.x86_64.rpm
krb5-pkinit-1.12.2-14.el7.x86_64.rpm
krb5-server-1.12.2-14.el7.x86_64.rpm
krb5-server-ldap-1.12.2-14.el7.x86_64.rpm
krb5-workstation-1.12.2-14.el7.x86_64.rpm
Red Hat Enterprise Linux Workstation (v. 7):
Source:
krb5-1.12.2-14.el7.src.rpm
x86_64:
krb5-debuginfo-1.12.2-14.el7.i686.rpm
krb5-debuginfo-1.12.2-14.el7.x86_64.rpm
krb5-devel-1.12.2-14.el7.i686.rpm
krb5-devel-1.12.2-14.el7.x86_64.rpm
krb5-libs-1.12.2-14.el7.i686.rpm
krb5-libs-1.12.2-14.el7.x86_64.rpm
krb5-pkinit-1.12.2-14.el7.x86_64.rpm
krb5-server-1.12.2-14.el7.x86_64.rpm
krb5-server-ldap-1.12.2-14.el7.x86_64.rpm
krb5-workstation-1.12.2-14.el7.x86_64.rpm
These packages are GPG signed by Red Hat for security. Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/
Topic
Updated krb5 packages that fix multiple security issues, several bugs, andadd various enhancements are now available for Red Hat Enterprise Linux 7.Red Hat Product Security has rated this update as having Moderate securityimpact. Common Vulnerability Scoring System (CVSS) base scores, which givedetailed severity ratings, are available for each vulnerability from theCVE links in the References section.Kerberos is a networked authentication system which allows clients andservers to authenticate to each other with the help of a trusted thirdparty, the Kerberos KDC.
Topic
Relevant Releases Architectures
Red Hat Enterprise Linux Client (v. 7) - x86_64
Red Hat Enterprise Linux Client Optional (v. 7) - x86_64
Red Hat Enterprise Linux ComputeNode (v. 7) - x86_64
Red Hat Enterprise Linux ComputeNode Optional (v. 7) - x86_64
Red Hat Enterprise Linux Server (v. 7) - ppc64, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 7) - x86_64
Bugs Fixed
1084068 - ipv6 address handling in krb5.conf
1102837 - Please backport improved GSSAPI mech configuration
1109102 - Kerberos does not handle incorrect Active Directory DNS SRV entries correctly
1109919 - Backport https support into libkrb5
1116180 - CVE-2014-4341 krb5: denial of service flaws when handling padding length longer than the plaintext
1118347 - ksu non-functional, gets invalid argument copying cred cache
1120581 - CVE-2014-4342 krb5: denial of service flaws when handling RFC 1964 tokens
1121789 - CVE-2014-4343: use-after-free crash in SPNEGO
1121876 - CVE-2014-4343 krb5: double-free flaw in SPNEGO initiators1121877 - CVE-2014-4344 krb5: NULL pointer dereference flaw in SPNEGO acceptor for continuation tokens
1127995 - aggressive kinit timeout causes AS_REQ resent and subsequent OTP auth failure
1128157 - CVE-2014-4345 krb5: buffer overrun in kadmind with LDAP backend (MITKRB5-SA-2014-001)
1166012 - libkadmclnt SONAME change (8 to 9) in krb5 1.12 update
1174543 - CVE-2014-5353 krb5: NULL pointer dereference when using a ticket policy name as a password policy name
1179856 - CVE-2014-5352 krb5: gss_process_context_token() incorrectly frees context (MITKRB5-SA-2015-001)
1179857 - CVE-2014-9421 krb5: kadmind doubly frees partial deserialization results (MITKRB5-SA-2015-001)
1179861 - CVE-2014-9422 krb5: kadmind incorrectly validates server principal name (MITKRB5-SA-2015-001)
1179863 - CVE-2014-9423 krb5: libgssrpc server applications leak uninitialized bytes (MITKRB5-SA-2015-001)
1184629 - kinit loops on principals on unknown error