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Monday, 28 July 2008 06:30

Apple in a bind over BIND

I've criticised Apple before for being slow to deliver patched versions of open source and other third-party software, but the latest example involving BIND, the software that provides DNS services, is hard to fathom.

Other vendors, including Microsoft and Cisco, released DNS patches earlier this month to protect their customers from the risk of Internet traffic being diverted to malicious servers. Apple's delay means users at sites running Mac OS X Server are still vulnerable to this attack.

Earlier this year, security researchers discovered a weakness in DNS protocols and implementations. DNS (Domain Name System) is the mechanism that converts human-friendly domain names such as to numeric IP addresses such as

The weakness could be used relatively easily by an attacker to 'poison' (maliciously change) the list of name-to-number mappings already established by a system.

The danger is that users would then be invisibly redirected to web sites other than those they intended to visit. This situation could be used for phishing (capturing people's account credentials for Internet banking and other sites involving value) or to lure visitors to servers loaded with malware that is silently transferred along with the web page (more a problem with Windows than other operating systems).

In a co-ordinated effort, most major vendors released fixes for affected software earlier this month. That included an update for Internet Systems Consortium's BIND, which is the most widely used DNS server.

So where is Apple's update? Please read on.

Although BIND is part of Mac OS X (both the regular and server versions, although the latter is the most significant in this situation), Apple has yet to release a BIND update for its customers.

Given that an exploit is publicly available, it makes you wonder why Apple has been so slow to react, especially when other vendors are advising their customers to apply corresponding patches as soon as possible.

It doesn't seem to be a problem for most users in homes and small businesses that rely on their ISPs for DNS, but it's hard to see why Mac OS X Server wasn't updated promptly. And by the time Apple had done that, how much more effort would it have been to release it for the client version of Mac OS X as well?


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Stephen Withers

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Stephen Withers is one of Australia¹s most experienced IT journalists, having begun his career in the days of 8-bit 'microcomputers'. He covers the gamut from gadgets to enterprise systems. In previous lives he has been an academic, a systems programmer, an IT support manager, and an online services manager. Stephen holds an honours degree in Management Sciences and a PhD in Industrial and Business Studies.



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