Fedora Core 3 Exim Update FEDORA-2005-001 Moderate Buffer Overflow

Exim is a mail transport agent (MTA) developed at the University of

Cambridge for use on Unix systems connected to the Internet. In style

it is similar to Smail 3, but its facilities are more extensive, and

in particular it has options for verifying incoming sender and

recipient addresses, for refusing mail from specified hosts, networks,

or senders, and for controlling mail relaying. Exim is in production

use at quite a few sites, some of which move hundreds of thousands of

messages per day.

Exiscan is compiled in to allow inbuilt scanning capability. See

https://duncanthrax.net/exiscan-acl/

This erratum fixes two relatively minor security issues which were discovered

in Exim in the last few weeks. The Common Vulnerabilities and Exposures

project (cve.mitre.org) has assigned the names CAN-2005-0021 and CAN-2005-0022

to these, respectively.

1. The function host_aton() can overflow a buffer if it is presented with an

illegal IPv6 address that has more than 8 components.

2. The second report described a buffer overflow in the function

spa_base64_to_bits(), which is part of the code for SPA authentication. This

code originated in the Samba project. The overflow can be exploited only if

you are using SPA authentication.

- Fix buffer overflows (CAN-2005-0021, CAN-2005-0022)

- Demonstrate SASL auth configuration in default config file

- Enable TLS and provide certificate if necessary

- Don't reject all GB2312 charset mail by default

f4cafadca104a85ff5f31cbf5ca4c4f1 SRPMS/exim-4.43-1.FC3.1.src.rpm

3412f5b4cf40ad504dbaf2b7e2fffa62 x86_64/exim-4.43-1.FC3.1.x86_64.rpm

1446c41e65cfd6f15ae60b969ab3d20c x86_64/exim-mon-4.43-1.FC3.1.x86_64.rpm

e71be8446d9e4d250ca40a41c2d7b49a x86_64/exim-doc-4.43-1.FC3.1.x86_64.rpm

1d515c5be494e657333549f72f4621e2 x86_64/exim-sa-4.43-1.FC3.1.x86_64.rpm

bcd320d0c2f88911a3ccc02b95cb2843 x86_64/debug/exim-debuginfo-4.43-1.FC3.1.x86_64.rpm

7c2205113fe3285a76b797748845548b i386/exim-4.43-1.FC3.1.i386.rpm

8227e5701319639057b951bc45bbecf8 i386/exim-mon-4.43-1.FC3.1.i386.rpm

3b7e2741f4208757e92ab2d228b1fe8a i386/exim-doc-4.43-1.FC3.1.i386.rpm

4e5cbfea028184d6710443a3c0e79c29 i386/exim-sa-4.43-1.FC3.1.i386.rpm

9c2c6e5d633104ca71bf80b062e9f0a2 i386/debug/exim-debuginfo-4.43-1.FC3.1.i386.rpm

This update can also be installed with the Update Agent; you can

launch the Update Agent with the 'up2date' command.

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