TippingPoint Zero Day Initiative

Novell NetMail IMAP Verb Literal Heap Overflow Vulnerability

ZDI-06-053: December 22nd, 2006


Affected Vendors

Affected Products

TippingPoint™ IPS Customer Protection

TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 4543. For further product information on the TippingPoint IPS:

Vulnerability Details

This vulnerability allows remote attackers to execute arbitrary code on affected versions of Novell NetMail. Authentication is not required to exploit this vulnerability.

The specific flaw exists in the NetMail IMAP service, imapd.exe. The service does not sufficiently validate user-input length values when literals are appended to IMAP verbs to specify a command continuation request. The memory allocated to store the additional data may be insufficient, leading to an exploitable heap-based buffer overflow.

Vendor Response

Novell has issued an update to correct this vulnerability. More details can be found at:

Disclosure Timeline

    2006-08-14 - Vulnerability reported to vendor
    2006-12-22 - Coordinated public release of advisory


This vulnerability was discovered by: