GLSA 200810-03: libspf2: DNS response buffer overflow

http://security.gentoo.org/

Severity:	high
Title:	libspf2: DNS response buffer overflow
Date:	10/30/2008
Bugs:	#242254
ID:	200810-03

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

Package	Vulnerable	Unaffected	Architecture(s)
mail-filter/libspf2	< 1.2.8	>= 1.2.8	All supported architectures

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

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@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.