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Red Hat: RHSA-2011:0170-01 Moderate: Libuser LDAP Authentication Flaw

red hat
Calendar Grey January 20, 2011
Scroller Redhat Esm H88
Crucial security patch launched for libuser in Red Hat Enterprise Linux addresses LDAP authentication vulnerability. Key upgrade highlights.
Updated libuser packages that fix one security issue are now available for Red Hat Enterprise Linux 4, 5, and 6

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

Summary

The libuser library implements a standardized interface for manipulating and administering user and group accounts. Sample applications that are modeled after applications from the shadow password suite (shadow-utils) are included in these packages.
It was discovered that libuser did not set the password entry correctly when creating LDAP (Lightweight Directory Access Protocol) users. If an administrator did not assign a password to an LDAP based user account, either at account creation with luseradd, or with lpasswd after account creation, an attacker could use this flaw to log into that account with a default password string that should have been rejected. (CVE-2011-0002)
Note: LDAP administrators that have used libuser tools to add users should check existing user accounts for plain text passwords, and reset them as necessary.
Users of libuser should upgrade to these updated packages, which contain a backported patch to correct this issue.

Topics%20covered

Topics Covered

security advisory moderate security update red hat libuser ldap auth flaw

References

https://access.redhat.com/security/cve/CVE-2011-0002 https://access.redhat.com/security/updates/classification/#moderate

Package List

Red Hat Enterprise Linux AS version 4:
Source:
i386: libuser-0.52.5-1.1.el4_8.1.i386.rpm libuser-debuginfo-0.52.5-1.1.el4_8.1.i386.rpm libuser-devel-0.52.5-1.1.el4_8.1.i386.rpm
ia64: libuser-0.52.5-1.1.el4_8.1.i386.rpm libuser-0.52.5-1.1.el4_8.1.ia64.rpm libuser-debuginfo-0.52.5-1.1.el4_8.1.i386.rpm libuser-debuginfo-0.52.5-1.1.el4_8.1.ia64.rpm libuser-devel-0.52.5-1.1.el4_8.1.ia64.rpm
ppc: libuser-0.52.5-1.1.el4_8.1.ppc.rpm libuser-0.52.5-1.1.el4_8.1.ppc64.rpm libuser-debuginfo-0.52.5-1.1.el4_8.1.ppc.rpm libuser-debuginfo-0.52.5-1.1.el4_8.1.ppc64.rpm libuser-devel-0.52.5-1.1.el4_8.1.ppc.rpm
s390: libuser-0.52.5-1.1.el4_8.1.s390.rpm libuser-debuginfo-0.52.5-1.1.el4_8.1.s390.rpm libuser-devel-0.52.5-1.1.el4_8.1.s390.rpm
s390x: libuser-0.52.5-1.1.el4_8.1.s390.rpm libuser-0.52.5-1.1.el4_8.1.s390x.rpm libuser-debuginfo-0.52.5-1.1.el4_8.1.s390.rpm libuser-debuginfo-0.52.5-1.1.el4_8.1.s390x.rpm libuser-devel-0.52.5-1.1.el4_8.1.s390x.rpm
x86_64: libuser-0.52.5-1.1.el4_8.1.i386.rpm libuser-0.52.5-1.1.el4_8.1.x86_64.rpm libuser-debuginfo-0.52.5-1.1.el4_8.1.i386.rpm libuser-debuginfo-0.52.5-1.1.el4_8.1.x86_64.rpm libuser-devel-0.52.5-1.1.el4_8.1.x86_64.rpm
Red Hat Enterprise Linux Desktop version 4:
Source:
i386: libuser-0.52.5-1.1.el4_8.1.i386.rpm

Read the Full Advisory


Advisory ID: RHSA-2011:0170-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2011:0170.html
Issue date: 2011-01-20

Topic

Updated libuser packages that fix one security issue are now available forRed Hat Enterprise Linux 4, 5, and 6.The Red Hat Security Response Team has rated this update as having moderatesecurity impact. A Common Vulnerability Scoring System (CVSS) base score,which gives a detailed severity rating, is available from the CVE link inthe References section.

Topics%20covered

Topics Covered

security advisory moderate security update red hat libuser ldap auth flaw

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 AS version 4 - i386, ia64, ppc, s390, s390x, x86_64

Red Hat Enterprise Linux Desktop (v. 5 client) - i386, x86_64

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 Desktop version 4 - i386, x86_64

Red Hat Enterprise Linux ES version 4 - i386, ia64, 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 Server Optional (v. 6) - i386, ppc64, s390x, x86_64

Red Hat Enterprise Linux WS version 4 - i386, ia64, x86_64

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

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

Bugs Fixed

643227 - CVE-2011-0002 libuser creates LDAP users with a default password

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