Symantec has issued a patch for a flaw in its scanning software that could cause a virus to run, rather than catch it.Ominously, this vulnerability is cross-platform and affects important server products like Symantec's mail gateway software. Patch 'em if you've got 'emand if Symantec has the patches you need.The vulnerability affects an antivirus library used by the majority of Symantec's antivirus and antispam products, including Norton SystemWorks 2004 and Symantec Mail Security for Exchange, the security provider said on Tuesday.