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Eudora Script Execution Vulnerability

11.19.02

BACKGROUND

Qualcomm Inc.'s Eudora is a graphical e-mail client for Windows and Macintosh. More information about it is available at http://www.eudora.com .

DESCRIPTION

Remote exploitation of a weakness in Eudora could allow for the potential retrieval of sensitive information from a targeted Eudora user's computer.

Eudora saves e-mail attachments in a predictable location.  Exploitation works as such: an attacker sends an e-mail to a Eudora user that directs he or she to a specific URL; the e-mail also contains an HTML-enabled e-mail attachment that contains scripting code. If the user is socially engineered into clicking on the link, then a frames page can load the attachment in one of its frames. The attachment can then retrieve (within the security settings of the local zone) the content of any local file, and transmit it back to the attacker. The attack script, in turn, can retrieve the contents of any local file and transmit it back to the attacker. Since the issue is simple to exploit, and the issue has still not been addressed, a sample attack script is not included in this advisory.

ANALYSIS

Exploitation could lead to further compromise if the attacker is able to retrieve sensitive files such as the Windows SAM table. It is also possible for the attacker to obtain other confidential information.  A secure implementation would involve using a random string within the directory structure to prevent this class of attacks (e.g. Mozilla e-mail client, etc.).

DETECTION

Eudora 5.1.1 and 5.2 are confirmed to be vulnerable; other versions may be affected as well.

To determine susceptibility, send an e-mail with an attachment to a test Eudora user. Check if Eudora stores it in the C:Program FilesQualcommEudoraattach directory (assuming a default installation).

WORKAROUND

Change the default location where Eudora stores e-mail attachments.

VENDOR RESPONSE

A Eudora Tech Support Specialist provided the following response (from head Eudora developer):

"In rare circumstances, certain ill-formatted MIME boundaries can cause Eudora to crash. It is exceedingly unlikely that this problem could be exploited to undermine security. The problem will be fixed in the next release of Eudora."

[iDEFENSE note: The response does not address the security implications of this advisory. Two attempts were made to change or clarify Qualcomm's response; all to no avail.]

CVE INFORMATION

The Mitre Corp.'s Common Vulnerabilities and Exposures (CVE) Project assigned the identification number CAN-2002-1210 to this issue.

DISCLOSURE TIMELINE

09/12/2002 Issue disclosed to iDEFENSE
10/14/2002 Qualcomm notified (eudora-custserv@eudora.com)
10/14/2002 iDEFENSE clients notified
10/15/2002 Autoresponse recieved
10/31/2002 Second attempt at contact
11/07/2002 Third attempt at contact
11/08/2002 Vendor response from J. Michael L. (mlreply@qualcomm.com)
11/10/2002 Clarification request of Vendor Response from iDEFENSE
11/11/2002 Same response from J. Michael L. (mlreply@qualcomm.com)
11/12/2002 Second clarification request of Vendor Response from iDEFENSE
11/19/2002 Still no reply for vendor clarification of response
11/19/2002 Public disclosure

CREDIT

Magnus Bodin (magnus@bodin.org) discovered the main components of this vulnerability. Bennett Haselton (bennett@peacefire.org) further elaborated on it and also provided iDEFENSE with working exploit code.