Executive Summary

Summary
Titlekrb5 security and bug fix update
Informations
NameRHSA-2012:0306First vendor Publication2012-02-21
VendorRedHatLast vendor Modification2012-02-21
Severity (Vendor) LowRevision03

Security-Database Scoring CVSS v2

Cvss vector : (AV:N/AC:L/Au:S/C:P/I:P/A:P)
Cvss Base Score6.5Attack RangeNetwork
Cvss Impact Score6.4Attack ComplexityLow
Cvss Expoit Score8AuthenticationRequires single instance
Calculate full CVSS 2.0 Vectors scores

Detail

Problem Description:

Updated krb5 packages that fix one security issue and various bugs are now
available for Red Hat Enterprise Linux 5.

The Red Hat Security Response Team has rated this update as having low
security impact. A Common Vulnerability Scoring System (CVSS) base score,
which gives a detailed severity rating, is available from the CVE link in
the References section.

2. Relevant releases/architectures:

RHEL Desktop Workstation (v. 5 client) - i386, x86_64
Red Hat Enterprise Linux (v. 5 server) - i386, ia64, ppc, s390x, x86_64
Red Hat Enterprise Linux Desktop (v. 5 client) - i386, x86_64

3. Description:

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).

It was found that ftpd, a Kerberos-aware FTP server, did not properly drop
privileges. On Red Hat Enterprise Linux 5, the ftpd daemon did not check
for the potential failure of the effective group ID change system call. If
the group ID change failed, a remote FTP user could use this flaw to gain
unauthorized read or write access to files that are owned by the root
group. (CVE-2011-1526)

Red Hat would like to thank the MIT Kerberos project for reporting this
issue. Upstream acknowledges Tim Zingelman as the original reporter.

This update also fixes the following bugs:

* Due to a mistake in the Kerberos libraries, a client could fail to
contact a Key Distribution Center (KDC) or terminate unexpectedly if the
client had already more than 1024 file descriptors in use. This update
backports modifications to the Kerberos libraries and the libraries use
the poll() function instead of the select() function, as poll() does not
have this limitation. (BZ#701444)

* The KDC failed to release memory when processing a TGS (ticket-granting
server) request from a client if the client request included an
authenticator with a subkey. As a result, the KDC consumed an excessive
amount of memory. With this update, the code releasing the memory has been
added and the problem no longer occurs. (BZ#708516)

* Under certain circumstances, if services requiring Kerberos
authentication sent two authentication requests to the authenticating
server, the second authentication request was flagged as a replay attack.
As a result, the second authentication attempt was denied. This update
applies an upstream patch that fixes this bug. (BZ#713500)

* Previously, if Kerberos credentials had expired, the klist command could
terminate unexpectedly with a segmentation fault when invoked with the -s
option. This happened when klist encountered and failed to process an entry
with no realm name while scanning the credential cache. With this update,
the underlying code has been modified and the command handles such entries
correctly. (BZ#729067)

* Due to a regression, multi-line FTP macros terminated prematurely with a
segmentation fault. This occurred because the previously-added patch failed
to properly support multi-line macros. This update restores the support for
multi-line macros and the problem no longer occurs. (BZ#735363, BZ#736132)

All users of krb5 are advised to upgrade to these updated packages, which
resolve these issues.

4. Solution:

Before applying this update, make sure all previously-released errata
relevant to your system have been applied.

This update is available via the Red Hat Network. Details on how to
use the Red Hat Network to apply this update are available at
https://access.redhat.com/kb/docs/DOC-11259

5. Bugs fixed (http://bugzilla.redhat.com/):

701444 - Fix libkrb5 to work when > 1024 file descriptors are in use
708516 - memory leak during kdc TGS request
711419 - CVE-2011-1526 krb5, krb5-appl: ftpd incorrect group privilege dropping (MITKRB5-SA-2011-005)
729067 - klist -s segfaults with expired credentials
750823 - Newly introduced defect into krb5

Original Source

Url : https://rhn.redhat.com/errata/RHSA-2012-0306.html

CWE : Common Weakness Enumeration

idName
CWE-264Permissions, Privileges, and Access Controls

OVAL Definitions

Definition Id: oval:org.mitre.oval:def:21313
 
Oval ID: oval:org.mitre.oval:def:21313
Title: RHSA-2011:0920: krb5-appl security update (Important)
Description: ftpd.c in the GSS-API FTP daemon in MIT Kerberos Version 5 Applications (aka krb5-appl) 1.0.1 and earlier does not check the krb5_setegid return value, which allows remote authenticated users to bypass intended group access restrictions, and create, overwrite, delete, or read files, via standard FTP commands, related to missing autoconf tests in a configure script.
Family: unix Class: patch
Reference(s): RHSA-2011:0920-01
CVE-2011-1526
Version: 4
Platform(s): Red Hat Enterprise Linux 6
Product(s): krb5-appl
Definition Synopsis:
Definition Id: oval:org.mitre.oval:def:21089
 
Oval ID: oval:org.mitre.oval:def:21089
Title: RHSA-2012:0306: krb5 security and bug fix update (Low)
Description: ftpd.c in the GSS-API FTP daemon in MIT Kerberos Version 5 Applications (aka krb5-appl) 1.0.1 and earlier does not check the krb5_setegid return value, which allows remote authenticated users to bypass intended group access restrictions, and create, overwrite, delete, or read files, via standard FTP commands, related to missing autoconf tests in a configure script.
Family: unix Class: patch
Reference(s): RHSA-2012:0306-03
CVE-2011-1526
Version: 4
Platform(s): Red Hat Enterprise Linux 5
Product(s): krb5
Definition Synopsis:
Definition Id: oval:org.mitre.oval:def:23359
 
Oval ID: oval:org.mitre.oval:def:23359
Title: ELSA-2012:0306: krb5 security and bug fix update (Low)
Description: ftpd.c in the GSS-API FTP daemon in MIT Kerberos Version 5 Applications (aka krb5-appl) 1.0.1 and earlier does not check the krb5_setegid return value, which allows remote authenticated users to bypass intended group access restrictions, and create, overwrite, delete, or read files, via standard FTP commands, related to missing autoconf tests in a configure script.
Family: unix Class: patch
Reference(s): ELSA-2012:0306-03
CVE-2011-1526
Version: 3
Platform(s): Oracle Linux 5
Product(s):
Definition Synopsis:
Definition Id: oval:org.mitre.oval:def:23140
 
Oval ID: oval:org.mitre.oval:def:23140
Title: ELSA-2011:0920: krb5-appl security update (Important)
Description: ftpd.c in the GSS-API FTP daemon in MIT Kerberos Version 5 Applications (aka krb5-appl) 1.0.1 and earlier does not check the krb5_setegid return value, which allows remote authenticated users to bypass intended group access restrictions, and create, overwrite, delete, or read files, via standard FTP commands, related to missing autoconf tests in a configure script.
Family: unix Class: patch
Reference(s): ELSA-2011:0920-01
CVE-2011-1526
Version: 3
Platform(s): Oracle Linux 6
Product(s):
Definition Synopsis:

CPE : Common Platform Enumeration

TypeDescriptionCount
Application1

OpenVAS Exploits

DateDescription
2012-08-02Name : SuSE Update for krb5-appl openSUSE-SU-2012:0019-1 (krb5-appl)
File : nvt/gb_suse_2012_0019_1.nasl
2012-08-02Name : SuSE Update for krb5-appl openSUSE-SU-2012:0051-1 (krb5-appl)
File : nvt/gb_suse_2012_0051_1.nasl
2012-06-06Name : RedHat Update for krb5-appl RHSA-2011:0920-01
File : nvt/gb_RHSA-2011_0920-01_krb5-appl.nasl
2012-02-21Name : RedHat Update for krb5 RHSA-2012:0306-03
File : nvt/gb_RHSA-2012_0306-03_krb5.nasl
2012-02-12Name : Gentoo Security Advisory GLSA 201201-14 (mit-krb5-appl)
File : nvt/glsa_201201_14.nasl
2012-01-09Name : Fedora Update for krb5-appl FEDORA-2011-17492
File : nvt/gb_fedora_2011_17492_krb5-appl_fc15.nasl
2011-08-07Name : Debian Security Advisory DSA 2283-1 (krb5-appl)
File : nvt/deb_2283_1.nasl
2011-07-27Name : Mandriva Update for krb5-appl MDVSA-2011:117 (krb5-appl)
File : nvt/gb_mandriva_MDVSA_2011_117.nasl
2011-07-18Name : Fedora Update for krb5-appl FEDORA-2011-9080
File : nvt/gb_fedora_2011_9080_krb5-appl_fc15.nasl
2011-07-18Name : Fedora Update for krb5-appl FEDORA-2011-9109
File : nvt/gb_fedora_2011_9109_krb5-appl_fc14.nasl

Open Source Vulnerability Database (OSVDB)

idDescription
73617Kerberos Applications GSS-API FTP Daemon EGID Privilege Matching Restriction ...

Information Assurance Vulnerability Management (IAVM)

DateDescription
2011-07-07IAVM : 2011-B-0077 - MIT Kerberos Remote Privilege Escalation Vulnerability
Severity : Category II - VMSKEY : V0029345

Nessus® Vulnerability Scanner

DateDescription
2013-07-12Name : The remote Oracle Linux host is missing one or more security updates.
File : oraclelinux_ELSA-2012-0306.nasl - Type : ACT_GATHER_INFO
2013-07-12Name : The remote Oracle Linux host is missing one or more security updates.
File : oraclelinux_ELSA-2011-0920.nasl - Type : ACT_GATHER_INFO
2012-08-01Name : The remote Scientific Linux host is missing one or more security updates.
File : sl_20120221_krb5_on_SL5_x.nasl - Type : ACT_GATHER_INFO
2012-08-01Name : The remote Scientific Linux host is missing one or more security updates.
File : sl_20110705_krb5_appl_on_SL6_x.nasl - Type : ACT_GATHER_INFO
2012-02-21Name : The remote Red Hat host is missing one or more security updates.
File : redhat-RHSA-2012-0306.nasl - Type : ACT_GATHER_INFO
2012-01-24Name : The remote Gentoo host is missing one or more security-related patches.
File : gentoo_GLSA-201201-14.nasl - Type : ACT_GATHER_INFO
2012-01-03Name : The remote SuSE 10 host is missing a security-related patch.
File : suse_krb5-7899.nasl - Type : ACT_GATHER_INFO
2012-01-03Name : The remote SuSE 11 host is missing one or more security updates.
File : suse_11_krb5-111229.nasl - Type : ACT_GATHER_INFO
2011-07-26Name : The remote Debian host is missing a security-related update.
File : debian_DSA-2283.nasl - Type : ACT_GATHER_INFO
2011-07-25Name : The remote Mandriva Linux host is missing one or more security updates.
File : mandriva_MDVSA-2011-117.nasl - Type : ACT_GATHER_INFO
2011-07-15Name : The remote Fedora host is missing a security update.
File : fedora_2011-9080.nasl - Type : ACT_GATHER_INFO
2011-07-15Name : The remote Fedora host is missing a security update.
File : fedora_2011-9109.nasl - Type : ACT_GATHER_INFO
2011-07-06Name : The remote Red Hat host is missing one or more security updates.
File : redhat-RHSA-2011-0920.nasl - Type : ACT_GATHER_INFO

Alert History

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DateInformations
2014-02-17 11:55:42
  • Multiple Updates