Stack-based buffer overflow in Novell Client 4.91 SP4 and earlier allows local users to cause a denial of service (crash) and possibly execute arbitrary code via a long username in the "forgotten password" dialog.

NWFILTER.SYS in Novell Client 4.91 SP 1 through SP 4 for Windows 2000, XP, and Server 2003 makes the \.\nwfilter device available for arbitrary user-mode input via METHOD_NEITHER IOCTLs, which allows local users to gain privileges by passing a kernel address as an argument and overwriting kernel memory locations.

Buffer overflow in the Novell Distributed Print Services (NDPS) Print Provider for Windows component (NDPPNT.DLL) in Novell Client 4.91 has unknown impact and remote attack vectors.