[UNIX] Evolution Multiple Format String Vulnerabilites

From: SecuriTeam (support_at_securiteam.com)
Date: 08/14/05

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Date: 14 Aug 2005 18:02:38 +0200

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      Evolution Multiple Format String Vulnerabilites
    ------------------------------------------------------------------------

    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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