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

Gentoo Linux Security Advisory GLSA 201001-08
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http://security.gentoo.org/
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Severity: High
Title: SquirrelMail: Multiple vulnerabilities
Date: January 13, 2010
Bugs: #269567, #270671
ID: 201001-08

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Synopsis
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Multiple vulnerabilities were found in SquirrelMail of which the worst
results in remote code execution.

Background
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SquirrelMail is a standards-based webmail package written in PHP.

Affected packages
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Package / Vulnerable / Unaffected
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1 mail-client/squirrelmail < 1.4.19 >=3D 1.4.19

Description
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Multiple vulnerabilities were found in SquirrelMail:

* Niels Teusink reported multiple input sanitation flaws in certain
encrypted strings in e-mail headers, related to
contrib/decrypt_headers.php, PHP_SELF and the query string (aka
QUERY_STRING) (CVE-2009-1578).

* Niels Teusink also reported that the map_yp_alias() function in
functions/imap_general.php does not filter shell metacharacters in a
username and that the original patch was incomplete (CVE-2009-1381,
CVE-2009-1579).

* Tomas Hoger discovered an unspecified session fixation
vulnerability (CVE-2009-1580).

* Luc Beurton reported that functions/mime.php does not protect the
application's content from Cascading Style Sheets (CSS) positioning
in HTML e-mail messages (CVE-2009-1581).

Impact
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The vulnerabilities allow remote attackers to execute arbitrary code
with the privileges of the user running the web server, to hijack web
sessions via a crafted cookie, to spoof the user interface and to
conduct Cross-Site Scripting and phishing attacks, via a specially
crafted message.

Workaround
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There is no known workaround at this time.

Resolution
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All SquirrelMail users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot --verbose ">=3Dmail-client/squirrelmail-1.4.=
19"

References
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[ 1 ] CVE-2009-1381
http://cve.mitre.org/cgi-bin/cvename.cgi?name=3DCVE-2009-1381
[ 2 ] CVE-2009-1578
http://cve.mitre.org/cgi-bin/cvename.cgi?name=3DCVE-2009-1578
[ 3 ] CVE-2009-1579
http://cve.mitre.org/cgi-bin/cvename.cgi?name=3DCVE-2009-1579
[ 4 ] CVE-2009-1580
http://cve.mitre.org/cgi-bin/cvename.cgi?name=3DCVE-2009-1580
[ 5 ] CVE-2009-1581
http://cve.mitre.org/cgi-bin/cvename.cgi?name=3DCVE-2009-1581

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-201001-08.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
https://bugs.gentoo.org.

License
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Copyright 2010 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