TippingPoint Zero Day Initiative

Novell NetMail AntiVirus Agent Multiple Heap Overflow Vulnerabilities

ZDI-07-072: December 10th, 2007


Affected Vendors

Affected Products

TippingPoint™ IPS Customer Protection

TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 5219, 5225. For further product information on the TippingPoint IPS:

Vulnerability Details

These vulnerabilities allow attackers to execute arbitrary code on vulnerable installations of Novell NetMail. User interaction is not required to exploit this vulnerability.

The specific flaws exist in the AntiVirus agent which listens on a random high TCP port. The avirus.exe service protocol reads a user-supplied ASCII integer value as an argument to a memory allocation routine. The specified size is added to without any integer overflow checks and can therefore result in an under allocation. A subsequent memory copy operation can then corrupt the heap and eventually result in arbitrary code execution.

Vendor Response

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

Disclosure Timeline

    2007-02-16 - Vulnerability reported to vendor
    2007-12-10 - Coordinated public release of advisory


This vulnerability was discovered by:
    Tenable Network Security