TippingPoint Zero Day Initiative

Enterasys NetSight nssyslogd PRI Remote Code Execution Vulnerability

ZDI-11-350: December 19th, 2011

CVSS Score

Affected Vendors


Affected Products


TippingPoint™ IPS Customer Protection

TippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 11871. For further product information on the TippingPoint IPS:

Vulnerability Details

This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Enterasys Netsight. Authentication is not required to exploit this vulnerability.

The flaw exists within the nssyslogd.exe component which listens by default on UDP port 514. When parsing a new syslog message the process attempts to copy the PRIO field to an intermediate variable. The process does not properly validate the size of the destination buffer and blindly copies user supplied data into a fixed-length buffer on the stack. A remote attacker can exploit this vulnerability to execute arbitrary code under the context of the SYSTEM user.

Vendor Response

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

Disclosure Timeline

    2011-04-27 - Vulnerability reported to vendor
    2011-12-19 - Coordinated public release of advisory


This vulnerability was discovered by:
    Jeremy Brown
    Andrea Micalizzi aka rgod