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Adobe Systems has promised to speed up its patching process, release regular security updates, and trawl through its legacy code after the company faced fierce criticism over its slow response to a zero-day vulnerability in its popular PDF viewer.

The move comes after Adobe noticed "significant changes in the threat landscape," said Brad Arkin, director for product security and privacy at the company, on Wednesday.

Adobe plans to issue patches every three months on the second Tuesday of the month, the same day that Microsoft releases its patches, Arkin said. Releasing patches in tandem with Microsoft is easier for administrators, who can test the fixes from both companies at the same time before updating desktop PC images.

Adobe's Reader and Acrobat software are used for creating and reading PDFs (Portable Document Format) files, which is the widely used format for saving web pages, creating forms and for other uses.

The programs also use JavaScript, a programming language which if not implemented correctly can allow hackers to create PDFs that trigger, for example, a memory corruption problem that can allow for complete control of a computer and all of its data.

Adobe has had a security development lifecycle - a set of protocols for dealing with problems - for at least four years. But as Adobe has developed Reader and Acrobat, the company didn't review the old legacy code for security vulnerabilities, Arkin said. It is doing that now.

Since February, Adobe has been hardening its code in its applications, Arkin said. That has included doing automated as well as human code reviews. Adobe is using "fuzzers," or tools that try to inject code into an application to see if it accepts data it shouldn't.

Adobe's engineers are also practicing "threat modelling," where engineers try to figure out areas where hackers could potentially cause mischief and find flaws in source code, Arkin said.

Adobe wants to speed up the time it takes to create a patch when a vulnerability is disclosed, Arkin said. It took Adobe two weeks to come up with a patch for the JBIG2 vulnerability revealed around the end of April. That "wasn't as fast as we'd have liked it to be," he said.

Arkin said Adobe plans to have its first quarterly patch update release within the next three to four months, although the exact date hasn't been set.

The intensive security review plans will be nearly permanent. "We don't think we're going to hit a point where it's done," Arkin said. "No product is going to be completely free of vulnerabilities."

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