This week's "Patch Tuesday" was already going to be quiet, with an update only for Windows. On Friday, Microsoft pulled that update, saying more testing is needed.
Microsoft on Tuesday in the US issued fixes for 14 flaws in Windows, including a security hole that one expert said is ripe for exploitation by a major worm.
Antivirus firms have urged affected users to patch their systems immediately after a new worm was discovered over the weekend that exploits a critical vulnerability in some Windows platforms.
Exploit code was published on Friday for a Windows flaw similar to the vulnerability that led to the Zotob worm that wreaked havoc in August.
Variants of the Zotob worm caused damage to Visa and American Express' internal networks yesterday, but both companies said their transactional systems were unaffected. However, carmaker Holden had to pay a bigger price.
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