[UNIX] Evolution Multiple Format String Vulnerabilites

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Evolution Multiple Format String Vulnerabilites
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SUMMARY

Evolution suffers from several format string bugs when handling data from
remote sources. These bugs lead to crashes or the execution of arbitrary
assembly language code.

DETAILS

Vulnerable Systems:
* Evolution version 1.5
* Evolution version 2.0
* Evolution version 2.1
* Evolution version 2.2
* Evolution version 2.3

Immune Systems:
* Evolution version 2.3.7 or newer

1) The first format string bug occurs when viewing the full vCard data
attached to an e-mail message.

When opening an e-mail message, only a compact view of some of the fields
from the vCard is displayed, and this does not trigger the vulnerability.
To be affected, the user must click on Show Full vCard or perform similar
actions such as clicking on Save in Addressbook and then viewing the saved
data under the Contacts tab.

Why is this important? An attacker might notice that an organisation uses
Evolution, for instance after seeing the "X-Mailer: Evolution x.y.z"
e-mail header in their e-mails. He or she could then send out e-mail
messages with malicious vCards to many e-mail accounts at the
organisation, in the hope that some of the recipients will view the full
vCard data sooner or later, thus exposing the organisation to this format
string bug.

2) The second format string bug occurs when displaying contact data from
remote LDAP servers.

3) The third format string bug occurs when displaying task list data from
remote servers.

4) The fourth, and least serious, format string bug occurs when the user
goes to the Calendars tab to save task list data that is vulnerable to
problem 3 above. Other calendar entries that do not come from task lists
are also affected.

Mitigating factors:
* Users that never use any of the vulnerable features in Evolution are
not affected.

Recommendations:
We recommend that users either upgrade to Evolution 2.3.7 (unstable) or
apply our unofficial patch to their Evolution installation.

Patch information:
Evolution 2.3.7 is available from the following source:
<http://ftp.gnome.org/pub/gnome/sources/evolution/>
http://ftp.gnome.org/pub/gnome/sources/evolution/

Our unofficial patch is available from the following page:
<http://www.sitic.se> http://www.sitic.se

ADDITIONAL INFORMATION

The information has been provided by <mailto:sitic@pts.se> SITIC
Vulnerability Advisory.

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