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Insecure Library Loading
Moderately critical

Ubuntu Postfix IPv6 Relaying Security Issue

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Release Date:  2005-02-04    Last Update:  2005-03-17    Views:  12,948

Secunia Advisory SA14137

Where:

From remote

Impact:

Security Bypass

Solution Status:

Vendor Patch

Operating System:

CVE Reference(s):

Description


Ubuntu has issued an update for postfix. This fixes a security issue, which can be exploited by malicious people to use a vulnerable system as an open relay.

The problem is caused due to an error in the IPv6 handling when "/proc/net/if_inet6" is not available (e.g. when running in a chroot jail). This makes it possible to relay mails through the system to any MX host with an IPv6 address.

Successful exploitation requires that "permit_mx_backup" is enabled in "smtpd_recipient_restrictions".


Solution:
Apply patches.

Further details available to Secunia VIM customers

Provided and/or discovered by:
Jean-Samuel Reynaud

Original Advisory:
http://www.ubuntulinux.org/support/documentation/usn/usn-74-2

Deep Links:
Links available to Secunia VIM customers

Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

Subject: Ubuntu Postfix IPv6 Relaying Security Issue

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