[gentoo-announce] [ GLSA 200810-03 ] libspf2: DNS response buffer overflow

[news 28]

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Gentoo Linux Security Advisory GLSA 200810-03

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http://security.gentoo.org/

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Severity: High

Title: libspf2: DNS response buffer overflow

Date: October 30, 2008

Bugs: #242254

ID: 200810-03

 

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Synopsis

========

 

A memory management error in libspf2 might allow for remote execution

of arbitrary code.

 

Background

==========

 

libspf2 is a library that implements the Sender Policy Framework,

allowing mail transfer agents to make sure that an email is authorized

by the domain name that it is coming from. Currently, only the exim MTA

uses libspf2 in Gentoo.

 

Affected packages

=================

 

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Package / Vulnerable / Unaffected

-------------------------------------------------------------------

1 mail-filter/libspf2 < 1.2.8 >= 1.2.8

 

Description

===========

 

libspf2 uses a fixed-length buffer to receive DNS responses and does

not properly check the length of TXT records, leading to buffer

overflows.

 

Impact

======

 

A remote attacker could store a specially crafted DNS entry and entice

a user or automated system using libspf2 to lookup that SPF entry (e.g.

by sending an email to the MTA), possibly allowing for the execution of

arbitrary code.

 

Workaround

==========

 

There is no known workaround at this time.

 

Resolution

==========

 

All libspf2 users should upgrade to the latest version:

 

# emerge --sync

# emerge --ask --oneshot --verbose ">=mail-filter/libspf2-1.2.8"

 

References

==========

 

[ 1 ] CVE-2008-2469

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-2469

 

Availability

============

 

This GLSA and any updates to it are available for viewing at

the Gentoo Security Website:

 

http://security.gentoo.org/glsa/glsa-200810-03.xml

 

Concerns?

=========

 

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 ( -at -) gentoo.org or alternatively, you may file a bug at

http://bugs.gentoo.org.

 

License

=======

 

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