IBM Patches Security Flaw in OS/400 V5R3
January 16, 2007 Alex Woodie
IBM issued several integrity PTFs last September to fix a security vulnerability in OS/400 and i5/OS V5R3 and V5R3M5. The problem, called the OS/400 Connection Reset Denial of Service Vulnerability, can be exploited by hackers to reset established TCP connections on iSeries and System i servers, according to security firm Secunia, which gave the vulnerability a “less critical” rating.
IBM issued four Program Temporary Fixes (PTFs) on September 26 to fix the problem, in which an established TCP connection can be reset by sending a specially crafted TCP packet. It appears that a hacker could potentially use this technique