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Red Hat Enterprise Linux 7 RHSA-2016:2591-02 Low: krb5 Service Crashes

red hat
Calendar Grey November 3, 2016
Dist Redhat Esm H88
Notice from Red Hat: New krb5 update arrives with minor security fixes and improvements. Ensure your systems remain protected!
An update for krb5 is now available for Red Hat Enterprise Linux 7

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

After installing the updated packages, running Kerberos services (krb5kdc, kadmin, and kprop) will be restarted automatically.

Summary

Kerberos is a network authentication system, which can improve the security of your network by eliminating the insecure practice of sending passwords over the network in unencrypted form. It allows clients and servers to authenticate to each other with the help of a trusted third party, the Kerberos key distribution center (KDC).
The following packages have been upgraded to a newer upstream version: krb5 (1.14.1). (BZ#1292153)
Security Fix(es):
* A NULL pointer dereference flaw was found in MIT Kerberos kadmind service. An authenticated attacker with permission to modify a principal entry could use this flaw to cause kadmind to dereference a null pointer and crash by supplying an empty DB argument to the modify_principal command, if kadmind was configured to use the LDAP KDB module. (CVE-2016-3119)
* A NULL pointer dereference flaw was found in MIT Kerberos krb5kdc service. An authenticated attacker could use this flaw to cause krb5kdc to dereference a null pointer and crash by making an S4U2Self request, if the restrict_anonymous_to_tgt option was set to true. (CVE-2016-3120)
Additional Changes:
For detailed information on changes in this release, see the Red Hat Enterprise Linux 7.3 Release Notes linked from the References section.

Topics%20covered

Topics Covered

security advisory network security bug fix Red Hat Enterprise Linux low severity authentication fix krb5 service

References

https://access.redhat.com/security/cve/CVE-2016-3119 https://access.redhat.com/security/cve/CVE-2016-3120 https://access.redhat.com/security/updates/classification#low https://docs.redhat.com/en/documentation/Red_Hat_Enterprise_Linux/7/html/7.3_Release_Notes/index.html

Package List

Red Hat Enterprise Linux Client (v. 7):
Source: krb5-1.14.1-26.el7.src.rpm
x86_64: krb5-debuginfo-1.14.1-26.el7.i686.rpm krb5-debuginfo-1.14.1-26.el7.x86_64.rpm krb5-libs-1.14.1-26.el7.i686.rpm krb5-libs-1.14.1-26.el7.x86_64.rpm krb5-pkinit-1.14.1-26.el7.x86_64.rpm krb5-workstation-1.14.1-26.el7.x86_64.rpm libkadm5-1.14.1-26.el7.i686.rpm libkadm5-1.14.1-26.el7.x86_64.rpm
Red Hat Enterprise Linux Client Optional (v. 7):
x86_64: krb5-debuginfo-1.14.1-26.el7.i686.rpm krb5-debuginfo-1.14.1-26.el7.x86_64.rpm krb5-devel-1.14.1-26.el7.i686.rpm krb5-devel-1.14.1-26.el7.x86_64.rpm krb5-server-1.14.1-26.el7.x86_64.rpm krb5-server-ldap-1.14.1-26.el7.x86_64.rpm
Red Hat Enterprise Linux ComputeNode (v. 7):
Source: krb5-1.14.1-26.el7.src.rpm
x86_64: krb5-debuginfo-1.14.1-26.el7.i686.rpm krb5-debuginfo-1.14.1-26.el7.x86_64.rpm krb5-libs-1.14.1-26.el7.i686.rpm krb5-libs-1.14.1-26.el7.x86_64.rpm krb5-pkinit-1.14.1-26.el7.x86_64.rpm krb5-workstation-1.14.1-26.el7.x86_64.rpm libkadm5-1.14.1-26.el7.i686.rpm libkadm5-1.14.1-26.el7.x86_64.rpm
Red Hat Enterprise Linux ComputeNode Optional (v. 7):
x86_64: krb5-debuginfo-1.14.1-26.el7.i686.rpm krb5-debuginfo-1.14.1-26.el7.x86_64.rpm krb5-devel-1.14.1-26.el7.i686.rpm krb5-devel-1.14.1-26.el7.x86_64.rpm krb5-server-1.14.1-26.el7.x86_64.rpm

Read the Full Advisory


Severity
low
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2016:2591-02
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2016:2591.html
Issue date: 2016-11-03

Topic

An update for krb5 is now available for Red Hat Enterprise Linux 7.Red Hat Product Security has rated this update as having a security impactof Low. A Common Vulnerability Scoring System (CVSS) base score, whichgives a detailed severity rating, is available for each vulnerability fromthe CVE link(s) in the References section.

Topics%20covered

Topics Covered

security advisory network security bug fix Red Hat Enterprise Linux low severity authentication fix krb5 service

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) - aarch64, ppc64, ppc64le, s390x, x86_64

Red Hat Enterprise Linux Workstation (v. 7) - x86_64

Bugs Fixed

1135427 - kadmin.local -q with wrong value in -e option doesn't return nonzero return code

1146945 - RFE: Kerberos should support dropping configuration snippets to /etc/ and /usr

1183058 - krb5-server requires systemd-sysv when it shouldn't need to

1247261 - ksu asks for password even if called by root

1256735 - krb5kdc.log file is world-readable on IPA

1283902 - Remove krb5-server dependency on initscripts unless it is needed

1284987 - Please backport fix for interposer

1290239 - Update krb5 spec file with changes made in fedora

1292153 - Rebase krb5 to 1.14.x

1296241 - Chrome crash in spnego_gss_inquire_context()

1297591 - [backport] Fix some uses of installed files in the test suite

1313457 - krb5 selinux patch leaks memory

1314493 - Skip unnecessary mech calls in gss_inquire_cred

1319616 - CVE-2016-3119 krb5: null pointer dereference in kadmin

1340304 - otp module incorrectly overwrites as_key

1349042 - Incorrect length calculation in libkrad

1361050 - CVE-2016-3120 krb5: S4U2Self KDC crash when anon is restricted

1363690 - ssh login permission denied when ldap/krb5 is enabled via authconfig

1364993 - MS-KKDCP with TLS SNI requires HTTP Host header

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