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Red Hat Enterprise Linux 6: RHSA-2012:0683 Important: Bind-Dyndb-LDAP DoS

red hat
Calendar Grey May 21, 2012
Dist Redhat Esm H88
A significant bind-dyndb-ldap enhancement has been released, addressing crucial LDAP query issues affecting CentOS.
An updated bind-dyndb-ldap package that fixes one security issue is 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.

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/articles/11258

Summary

The dynamic LDAP back end is a plug-in for BIND that provides back-end capabilities to LDAP databases. It features support for dynamic updates and internal caching that help to reduce the load on LDAP servers.
A flaw was found in the way bind-dyndb-ldap handled LDAP query errors. If a remote attacker were able to send DNS queries to a named server that is configured to use bind-dyndb-ldap, they could trigger such an error with a DNS query leveraging bind-dyndb-ldap's insufficient escaping of the LDAP base DN (distinguished name). This would result in an invalid LDAP query that named would retry in a loop, preventing it from responding to other DNS queries. With this update, bind-dyndb-ldap only attempts to retry one time when an LDAP search returns an unexpected error. (CVE-2012-2134)
Red Hat would like to thank Ronald van Zantvoort for reporting this issue.
All bind-dyndb-ldap users should upgrade to this updated package, which contains a backported patch to correct this issue. For the update to take effect, the named service must be restarted.

Topics%20covered

Topics Covered

security advisory security issue Red Hat DoS important LDAP bind-dyndb-ldap

References

https://access.redhat.com/security/cve/CVE-2012-2134 https://access.redhat.com/security/updates/classification#important

Package List

Red Hat Enterprise Linux Server (v. 6):
Source:
i386: bind-dyndb-ldap-0.2.0-7.el6_2.1.i686.rpm bind-dyndb-ldap-debuginfo-0.2.0-7.el6_2.1.i686.rpm
ppc64: bind-dyndb-ldap-0.2.0-7.el6_2.1.ppc64.rpm bind-dyndb-ldap-debuginfo-0.2.0-7.el6_2.1.ppc64.rpm
s390x: bind-dyndb-ldap-0.2.0-7.el6_2.1.s390x.rpm bind-dyndb-ldap-debuginfo-0.2.0-7.el6_2.1.s390x.rpm
x86_64: bind-dyndb-ldap-0.2.0-7.el6_2.1.x86_64.rpm bind-dyndb-ldap-debuginfo-0.2.0-7.el6_2.1.x86_64.rpm
Red Hat Enterprise Linux Workstation (v. 6):
Source:
i386: bind-dyndb-ldap-0.2.0-7.el6_2.1.i686.rpm bind-dyndb-ldap-debuginfo-0.2.0-7.el6_2.1.i686.rpm
x86_64: bind-dyndb-ldap-0.2.0-7.el6_2.1.x86_64.rpm bind-dyndb-ldap-debuginfo-0.2.0-7.el6_2.1.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#package


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2012:0683-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2012:0683.html
Issue date: 2012-05-21

Topic

An updated bind-dyndb-ldap package that fixes one security issue is nowavailable for Red Hat Enterprise Linux 6.The Red Hat Security Response Team has rated this update as havingimportant security impact. A Common Vulnerability Scoring System (CVSS)base score, which gives a detailed severity rating, is available from theCVE link in the References section.

Topics%20covered

Topics Covered

security advisory security issue Red Hat DoS important LDAP bind-dyndb-ldap

Relevant Releases Architectures

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

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

Bugs Fixed

815846 - CVE-2012-2134 bind-dyndb-ldap: Bind DoS (named hang) by processing DNS query for zone served by bind-dyndb-ldap

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