IBM released a patch for the vulnerability tonight
it's available on 80 column punched cards or 800BPI magnetic tape
Twitter security celeb SwiftOnSecurity on Tuesday inadvertently disclosed a zero-day vulnerability affecting enterprise software biz Atlassian, a flaw that may be echoed in IBM's Aspera software. The SwiftOnSecurity Twitter account revealed that Atlassian provided a domain that resolved to a local server with a common SSL …
For the benefit of readers who don't twitt ...
Who exactly can grab this private key, and how? Surely a private key that can be accessed by an unauthorised person is a big no-no, but orthogonal to an idiosyncratic DNS usage?
DNS is designed for performance over security, which is a major reason we don't rely on it for secure transactions and have SSL certs. When you describe a DNS entry as a vulnerability, it looks as if you're suggesting a misplaced reliance on something that's inherently insecure. Or in other words, propping up the edifice by painting over the cracks.
Looks like they try connecting back to localhost, but via a somewhat circuitous route.
1. Look up DNS record
2. Get back 127.0.0.1
3. Connect to 127.0.0.1 with server name as above
4. Get presented certificate for that server name. So connection is all ok. (Plus since it is a trusted certificate you avoid all warnings. Just connecting to 127.0.0.1 won't work)
For localhost to be able to use that certificate, it must have the key, i.e. you have the key inside the connector. But not just you, everybody with the app has it.
So if instead you
1. Look up DNS record
2. Get back evil hacker's IP
3. Connect to evil hacker's IP with server name as above
4. Get presented certificate for that server name. So connection is all ok. Isn't it?
Far better for your localhost to have its own certificate, and have the client trust just that. However that takes more work.
Who exactly can grab this private key, and how?
Anyone with a copy of the Atlassian Confluence desktop application, by debugging. The private key is embedded in the desktop app.
This is a classic error, and per the Twitter thread, there are likely many, many more offenders.
I'm not sure how that helps.
http://localhost - you get a warning in your address bar that the site is not secure
https://localhost - you get dire warnings about invalid ssl certificates, and it is very difficult to access the site unless you know what you are doing.
Install a self-signed certificate - your anti-virus software will probably go mental
The correct answer is to have your own domain, use split-horizon dns to resolve to localhost, get your own ssl certificate for it and install that. But that is too much work for the average person.
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