Hacker News Reader

Comment by RyJones | Hacker News Reader

I'm sure everything that linked against it is vulnerable, and as soon as we have an update, they'll all be OK.

I just wish the update were out now.

Most iOS users have not gotten the update notification yet. And many of those who have are waiting to apply the update since it requires a reboot. In addition, the update is only available for iOS 7.0.5 except for the 3GS and its iPod Touch equivalent. There is still a substantial number of iOS users on iOS 6 – usually not by incident …

There's one major problem: software updater itself is vulnerable. So in theory the only way to get a clean system is to download a fresh, fixed installer via a channel that's not affected and reinstall. What a mess.

This is a problem only if updates are not signed.

No, it's not. The updater needs to know the correct signatures and it doesn't have a trusted way of retrieving them. Also, any previous update may have been malicious and replaced the updater. The updater may very well have embedded keys, but we don't know, so the secure option would be not to trust it.

That's not how signing works. Also, if the signing is indeed implemented correctly, then the updater cannot have been compromised earlier.

The updater verifies the signature using the public counterpart to Apple's current private key. It can only be changed by updating the updater (or a separate keys-only package), with the correct signature.

Or at least that's how it's supposed to work.

Interestingly enough, I just checked a system with Snow Leopard using Safari and Firefox and it seems that both do not have this vulnerability.

I can't say when this was introduced, but if it is in Mavericks, it must have gotten there sometime between Lion and Mountain Lion.

Not that interesting, as this was introduced in Mavericks.

http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2014-126...

Reply on news.ycombinator.com