According to the alert, systems with JRun 3.1 installed on Microsoft's Internet Information Services 4 and 5 on Windows NT 4 and 2000 are vulnerable to this flaw, which can be exploited remotely.
The flaw is made possible when an Internet Services application programming interface file is created during the installation of JRun 3.1. A related flaw enabled the Code Red virus to infect hundreds of thousands of systems worldwide last summer.
Macromedia's recently released JRun version 4 shouldn't be affected by the security glitch, Next Generation says. It's urging companies to upgrade to that version. A patch can be found at http://www.macromedia.com/v1/handlers/index.cfm?ID=22994