Novell GroupWise Internet Agent TZID Parsing Remote Code Execution VulnerabilityZDI-11-027: January 26th, 2011
TippingPoint™ IPS Customer ProtectionTippingPoint IPS customers are protected against this vulnerability by Digital Vaccine protection filter ID 10797. For further product information on the TippingPoint IPS:
This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Novell GroupWise. Authentication is not required to exploit this vulnerability.
The specific flaw exists within the gwwww1.dll module responsible for parsing VCALENDAR data within e-mail messages. When the code encounters a TZID variable it allocates up to 0xFFFF bytes for the variable's value. It then proceeds to copy the value into the fixed-length buffer without checking if it will fit. By specifying a large enough string in the e-mail, an attacker can overflow the buffer and execute arbitrary code under the context of the SYSTEM user.
Vendor ResponseNovell has issued an update to correct this vulnerability. More details can be found at:
2010-11-30 - Vulnerability reported to vendor
2011-01-26 - Coordinated public release of advisory
CreditThis vulnerability was discovered by: