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Red Hat Product Errata RHSA-2009:1238 - Security Advisory
Issued:
2009-08-31
Updated:
2009-08-31

RHSA-2009:1238 - Security Advisory

  • Overview
  • Updated Packages

Synopsis

Important: dnsmasq security update

Type/Severity

Security Advisory: Important

Red Hat Insights patch analysis

Identify and remediate systems affected by this advisory.

View affected systems

Topic

An updated dnsmasq package that fixes two security issues is now available
for Red Hat Enterprise Linux 5.

This update has been rated as having important security impact by the Red
Hat Security Response Team.

Description

Dnsmasq is a lightweight and easy to configure DNS forwarder and DHCP
server.

Core Security Technologies discovered a heap overflow flaw in dnsmasq when
the TFTP service is enabled (the "--enable-tftp" command line option, or by
enabling "enable-tftp" in "/etc/dnsmasq.conf"). If the configured tftp-root
is sufficiently long, and a remote user sends a request that sends a long
file name, dnsmasq could crash or, possibly, execute arbitrary code with
the privileges of the dnsmasq service (usually the unprivileged "nobody"
user). (CVE-2009-2957)

A NULL pointer dereference flaw was discovered in dnsmasq when the TFTP
service is enabled. This flaw could allow a malicious TFTP client to crash
the dnsmasq service. (CVE-2009-2958)

Note: The default tftp-root is "/var/ftpd", which is short enough to make
it difficult to exploit the CVE-2009-2957 issue; if a longer directory name
is used, arbitrary code execution may be possible. As well, the dnsmasq
package distributed by Red Hat does not have TFTP support enabled by
default.

All users of dnsmasq should upgrade to this updated package, which contains
a backported patch to correct these issues. After installing the updated
package, the dnsmasq service must be restarted for the update to take
effect.

Solution

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

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

Affected Products

  • Red Hat Enterprise Linux Server 5 x86_64
  • Red Hat Enterprise Linux Server 5 ia64
  • Red Hat Enterprise Linux Server 5 i386
  • Red Hat Enterprise Linux for x86_64 - Extended Update Support 5.3 x86_64
  • Red Hat Enterprise Linux for x86_64 - Extended Update Support 5.3 ia64
  • Red Hat Enterprise Linux for x86_64 - Extended Update Support 5.3 i386
  • Red Hat Enterprise Linux Server - AUS 5.3 x86_64
  • Red Hat Enterprise Linux Server - AUS 5.3 ia64
  • Red Hat Enterprise Linux Server - AUS 5.3 i386
  • Red Hat Enterprise Linux Workstation 5 x86_64
  • Red Hat Enterprise Linux Workstation 5 i386
  • Red Hat Enterprise Linux Desktop 5 x86_64
  • Red Hat Enterprise Linux Desktop 5 i386
  • Red Hat Enterprise Linux for IBM z Systems 5 s390x
  • Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 5.3 s390x
  • Red Hat Enterprise Linux for Power, big endian 5 ppc
  • Red Hat Enterprise Linux for Power, big endian - Extended Update Support 5.3 ppc
  • Red Hat Enterprise Linux Server from RHUI 5 x86_64
  • Red Hat Enterprise Linux Server from RHUI 5 i386

Fixes

  • BZ - 519020 - CVE-2009-2957, CVE-2009-2958 dnsmasq: multiple vulnerabilities in TFTP server

CVEs

  • CVE-2009-2957
  • CVE-2009-2958

References

  • http://www.redhat.com/security/updates/classification/#important
Note: More recent versions of these packages may be available. Click a package name for more details.

Red Hat Enterprise Linux Server 5

SRPM
dnsmasq-2.45-1.1.el5_3.src.rpm SHA-256: d5ee8b66720c40cb1e556145eb8fcaee0adbd0d72d8f66bbb84d5bb6a2c5d117
x86_64
dnsmasq-2.45-1.1.el5_3.x86_64.rpm SHA-256: aadf31b24481e1bcbe406f0fc2919deaaa1d190569b9bd065ec3f31091cba085
ia64
dnsmasq-2.45-1.1.el5_3.ia64.rpm SHA-256: 48e7a1a43c6ed865fa945c23a5b24fd5646d362c8a17aed43953f69824431933
i386
dnsmasq-2.45-1.1.el5_3.i386.rpm SHA-256: f550b0ac9f70f945a18ddc34de082b726a91bfa0e200a94df51735ca65eebfca

Red Hat Enterprise Linux for x86_64 - Extended Update Support 5.3

SRPM
x86_64
ia64
i386

Red Hat Enterprise Linux Server - AUS 5.3

SRPM
x86_64
ia64
i386

Red Hat Enterprise Linux Workstation 5

SRPM
dnsmasq-2.45-1.1.el5_3.src.rpm SHA-256: d5ee8b66720c40cb1e556145eb8fcaee0adbd0d72d8f66bbb84d5bb6a2c5d117
x86_64
dnsmasq-2.45-1.1.el5_3.x86_64.rpm SHA-256: aadf31b24481e1bcbe406f0fc2919deaaa1d190569b9bd065ec3f31091cba085
i386
dnsmasq-2.45-1.1.el5_3.i386.rpm SHA-256: f550b0ac9f70f945a18ddc34de082b726a91bfa0e200a94df51735ca65eebfca

Red Hat Enterprise Linux Desktop 5

SRPM
dnsmasq-2.45-1.1.el5_3.src.rpm SHA-256: d5ee8b66720c40cb1e556145eb8fcaee0adbd0d72d8f66bbb84d5bb6a2c5d117
x86_64
dnsmasq-2.45-1.1.el5_3.x86_64.rpm SHA-256: aadf31b24481e1bcbe406f0fc2919deaaa1d190569b9bd065ec3f31091cba085
i386
dnsmasq-2.45-1.1.el5_3.i386.rpm SHA-256: f550b0ac9f70f945a18ddc34de082b726a91bfa0e200a94df51735ca65eebfca

Red Hat Enterprise Linux for IBM z Systems 5

SRPM
dnsmasq-2.45-1.1.el5_3.src.rpm SHA-256: d5ee8b66720c40cb1e556145eb8fcaee0adbd0d72d8f66bbb84d5bb6a2c5d117
s390x
dnsmasq-2.45-1.1.el5_3.s390x.rpm SHA-256: 63e0f26c8ca386717406003ea918cd12f4492dd170dbc072806d94e70b98dfaa

Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 5.3

SRPM
s390x

Red Hat Enterprise Linux for Power, big endian 5

SRPM
dnsmasq-2.45-1.1.el5_3.src.rpm SHA-256: d5ee8b66720c40cb1e556145eb8fcaee0adbd0d72d8f66bbb84d5bb6a2c5d117
ppc
dnsmasq-2.45-1.1.el5_3.ppc.rpm SHA-256: 26fc7613904b8da4ecd1ea6d9662549ac984e21801049230c417af20f84a33a1

Red Hat Enterprise Linux for Power, big endian - Extended Update Support 5.3

SRPM
ppc

Red Hat Enterprise Linux Server from RHUI 5

SRPM
dnsmasq-2.45-1.1.el5_3.src.rpm SHA-256: d5ee8b66720c40cb1e556145eb8fcaee0adbd0d72d8f66bbb84d5bb6a2c5d117
x86_64
dnsmasq-2.45-1.1.el5_3.x86_64.rpm SHA-256: aadf31b24481e1bcbe406f0fc2919deaaa1d190569b9bd065ec3f31091cba085
i386
dnsmasq-2.45-1.1.el5_3.i386.rpm SHA-256: f550b0ac9f70f945a18ddc34de082b726a91bfa0e200a94df51735ca65eebfca

The Red Hat security contact is secalert@redhat.com. More contact details at https://access.redhat.com/security/team/contact/.

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