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Red Hat Enterprise Linux 6 RHSA-2015:0794-01 Moderate: krb5 Remote Access

red hat
Calendar Grey April 9, 2015
Dist Redhat Esm H88
Patch released for Red Hat Enterprise Linux addressing various moderate vulnerabilities found in krb5 packages. This is a critical security notice.
Updated krb5 packages that fix multiple security issues are now available for Red Hat Enterprise Linux 6

Solution

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

Summary

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.
The following security issues are fixed with this release:
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) could call the gss_process_context_token() function and 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 who has 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)
It was found that the krb5_read_message() function of MIT Kerberos did not correctly sanitize input, and could create invalid krb5_data objects. A remote, unauthenticated attacker could use this flaw to crash a Kerberos child process via a specially crafted request. (CVE-2014-5355)
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, via 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)
Red Hat would like to thank the MIT Kerberos project for reporting CVE-2014-5352, CVE-2014-9421, and CVE-2014-9422. The MIT Kerberos project acknowledges Nico Williams for assisting with the analysis of CVE-2014-5352.
All krb5 users are advised to upgrade to these updated packages, which contain backported patches to correct these issues.

Topics%20covered

Topics Covered

security advisory remote access Red Hat Enterprise Linux krb5 update moderate security

References

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-2014-5355 https://access.redhat.com/security/cve/CVE-2014-9421 https://access.redhat.com/security/cve/CVE-2014-9422 https://access.redhat.com/security/updates/classification#moderate

Package List

Red Hat Enterprise Linux Desktop (v. 6):
Source: krb5-1.10.3-37.el6_6.src.rpm
i386: krb5-debuginfo-1.10.3-37.el6_6.i686.rpm krb5-libs-1.10.3-37.el6_6.i686.rpm krb5-pkinit-openssl-1.10.3-37.el6_6.i686.rpm krb5-workstation-1.10.3-37.el6_6.i686.rpm
x86_64: krb5-debuginfo-1.10.3-37.el6_6.i686.rpm krb5-debuginfo-1.10.3-37.el6_6.x86_64.rpm krb5-libs-1.10.3-37.el6_6.i686.rpm krb5-libs-1.10.3-37.el6_6.x86_64.rpm krb5-pkinit-openssl-1.10.3-37.el6_6.x86_64.rpm krb5-workstation-1.10.3-37.el6_6.x86_64.rpm
Red Hat Enterprise Linux Desktop Optional (v. 6):
i386: krb5-debuginfo-1.10.3-37.el6_6.i686.rpm krb5-devel-1.10.3-37.el6_6.i686.rpm krb5-server-1.10.3-37.el6_6.i686.rpm krb5-server-ldap-1.10.3-37.el6_6.i686.rpm
x86_64: krb5-debuginfo-1.10.3-37.el6_6.i686.rpm krb5-debuginfo-1.10.3-37.el6_6.x86_64.rpm krb5-devel-1.10.3-37.el6_6.i686.rpm krb5-devel-1.10.3-37.el6_6.x86_64.rpm krb5-server-1.10.3-37.el6_6.x86_64.rpm krb5-server-ldap-1.10.3-37.el6_6.i686.rpm krb5-server-ldap-1.10.3-37.el6_6.x86_64.rpm
Red Hat Enterprise Linux HPC Node (v. 6):
Source: krb5-1.10.3-37.el6_6.src.rpm
x86_64: krb5-debuginfo-1.10.3-37.el6_6.i686.rpm krb5-debuginfo-1.10.3-37.el6_6.x86_64.rpm krb5-libs-1.10.3-37.el6_6.i686.rpm krb5-libs-1.10.3-37.el6_6.x86_64.rpm krb5-pkinit-openssl-1.10.3-37.el6_6.x86_64.rpm

Read the Full Advisory


Advisory ID: RHSA-2015:0794-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2015:0794.html
Issue date: 2015-04-09

Topic

Updated krb5 packages that fix multiple security issues are now availablefor Red Hat Enterprise Linux 6.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.

Topics%20covered

Topics Covered

security advisory remote access Red Hat Enterprise Linux krb5 update moderate security

Relevant Releases Architectures

Red Hat Enterprise Linux Desktop (v. 6) - i386, x86_64

Red Hat Enterprise Linux Desktop Optional (v. 6) - i386, x86_64

Red Hat Enterprise Linux HPC Node (v. 6) - x86_64

Red Hat Enterprise Linux HPC Node Optional (v. 6) - x86_64

Red Hat Enterprise Linux Server (v. 6) - i386, ppc64, s390x, x86_64

Red Hat Enterprise Linux Workstation (v. 6) - i386, x86_64

Bugs Fixed

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)

1193939 - CVE-2014-5355 krb5: unauthenticated denial of service in recvauth_common() and others

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