A new security update has been released for Gentoo Linux - Ruby: Multiple vulnerabilities. Here the announcement:

Gentoo Linux Security Advisory GLSA 200812-17
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http://security.gentoo.org/
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Severity: Normal
Title: Ruby: Multiple vulnerabilities
Date: December 16, 2008
Bugs: #225465, #236060
ID: 200812-17

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Synopsis
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Multiple vulnerabilities have been discovered in Ruby that allow for
attacks including arbitrary code execution and Denial of Service.

Background
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Ruby is an interpreted object-oriented programming language. The
elaborate standard library includes an HTTP server ("WEBRick") and a
class for XML parsing ("REXML").

Affected packages
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Package / Vulnerable / Unaffected
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1 dev-lang/ruby < 1.8.6_p287-r1 >=3D 1.8.6_p287-r1

Description
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Multiple vulnerabilities have been discovered in the Ruby interpreter
and its standard libraries. Drew Yao of Apple Product Security
discovered the following flaws:

* Arbitrary code execution or Denial of Service (memory corruption)
in the rb_str_buf_append() function (CVE-2008-2662).

* Arbitrary code execution or Denial of Service (memory corruption)
in the rb_ary_stor() function (CVE-2008-2663).

* Memory corruption via alloca in the rb_str_format() function
(CVE-2008-2664).

* Memory corruption ("REALLOC_N") in the rb_ary_splice() and
rb_ary_replace() functions (CVE-2008-2725).

* Memory corruption ("beg + rlen") in the rb_ary_splice() and
rb_ary_replace() functions (CVE-2008-2726).

Furthermore, several other vulnerabilities have been reported:

* Tanaka Akira reported an issue with resolv.rb that enables
attackers to spoof DNS responses (CVE-2008-1447).

* Akira Tagoh of RedHat discovered a Denial of Service (crash) issue
in the rb_ary_fill() function in array.c (CVE-2008-2376).

* Several safe level bypass vulnerabilities were discovered and
reported by Keita Yamaguchi (CVE-2008-3655).

* Christian Neukirchen is credited for discovering a Denial of
Service (CPU consumption) attack in the WEBRick HTTP server
(CVE-2008-3656).

* A fault in the dl module allowed the circumvention of taintness
checks which could possibly lead to insecure code execution was
reported by "sheepman" (CVE-2008-3657).

* Tanaka Akira again found a DNS spoofing vulnerability caused by the
resolv.rb implementation using poor randomness (CVE-2008-3905).

* Luka Treiber and Mitja Kolsek (ACROS Security) disclosed a Denial
of Service (CPU consumption) vulnerability in the REXML module when
dealing with recursive entity expansion (CVE-2008-3790).

Impact
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These vulnerabilities allow remote attackers to execute arbitrary code,
spoof DNS responses, bypass Ruby's built-in security and taintness
checks, and cause a Denial of Service via crash or CPU exhaustion.

Workaround
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There is no known workaround at this time.

Resolution
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All Ruby users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot --verbose ">=3Ddev-lang/ruby-1.8.6_p287-r1"

References
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[ 1 ] CVE-2008-1447
http://cve.mitre.org/cgi-bin/cvename.cgi?name=3DCVE-2008-1447
[ 2 ] CVE-2008-2376
http://cve.mitre.org/cgi-bin/cvename.cgi?name=3DCVE-2008-2376
[ 3 ] CVE-2008-2662
http://cve.mitre.org/cgi-bin/cvename.cgi?name=3DCVE-2008-2662
[ 4 ] CVE-2008-2663
http://cve.mitre.org/cgi-bin/cvename.cgi?name=3DCVE-2008-2663
[ 5 ] CVE-2008-2664
http://cve.mitre.org/cgi-bin/cvename.cgi?name=3DCVE-2008-2664
[ 6 ] CVE-2008-2725
http://cve.mitre.org/cgi-bin/cvename.cgi?name=3DCVE-2008-2725
[ 7 ] CVE-2008-2726
http://cve.mitre.org/cgi-bin/cvename.cgi?name=3DCVE-2008-2726
[ 8 ] CVE-2008-3655
http://cve.mitre.org/cgi-bin/cvename.cgi?name=3DCVE-2008-3655
[ 9 ] CVE-2008-3656
http://cve.mitre.org/cgi-bin/cvename.cgi?name=3DCVE-2008-3656
[ 10 ] CVE-2008-3657
http://cve.mitre.org/cgi-bin/cvename.cgi?name=3DCVE-2008-3657
[ 11 ] CVE-2008-3790
http://cve.mitre.org/cgi-bin/cvename.cgi?name=3DCVE-2008-3790
[ 12 ] CVE-2008-3905
http://cve.mitre.org/cgi-bin/cvename.cgi?name=3DCVE-2008-3905

Availability
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This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

http://security.gentoo.org/glsa/glsa-200812-17.xml

Concerns?
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Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users machines is of utmost
importance to us. Any security concerns should be addressed to
security@gentoo.org or alternatively, you may file a bug at
http://bugs.gentoo.org.

License
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Copyright 2008 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.

http://creativecommons.org/licenses/by-sa/2.5