Me: Threat-hunting rare DNS lookups in a corporate network. Confluence: https://www.google.com/search?&q=%22atlassian-domain-for-localhost-connections-only.com%22 …pic.twitter.com/pse4VwORiZ
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Vulnerability Analyst at the CERT/CC. My thoughts are my own, not my employer's.
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| Country | Code | For customers of |
|---|---|---|
| United States | 40404 | (any) |
| Canada | 21212 | (any) |
| United Kingdom | 86444 | Vodafone, Orange, 3, O2 |
| Brazil | 40404 | Nextel, TIM |
| Haiti | 40404 | Digicel, Voila |
| Ireland | 51210 | Vodafone, O2 |
| India | 53000 | Bharti Airtel, Videocon, Reliance |
| Indonesia | 89887 | AXIS, 3, Telkomsel, Indosat, XL Axiata |
| Italy | 4880804 | Wind |
| 3424486444 | Vodafone | |
| » See SMS short codes for other countries | ||
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Me: Threat-hunting rare DNS lookups in a corporate network. Confluence: https://www.google.com/search?&q=%22atlassian-domain-for-localhost-connections-only.com%22 …pic.twitter.com/pse4VwORiZ
Did you know you just dropped a 0day on twitter? 
Wait... are you serious? They... actually embed the private cert somewhere? I was just laughing at the domain name.
Yes, it happens sometimes, as soon as someone pulls out the key the CA is required to revoke it. They probably did it to avoid mixed-content warnings, as you can probably guess... it's not the correct solution. Anyone using this app is vulnerable to trivial MITM 
Interestingly, that host doesn't show up in http://crt.sh , so they didn't do the most convenient common bad thing.
I pulled out the certificates here, they do seem valid at first glance, not sure why they didn't get logged in CT.
https://pastebin.com/F8UD8Ypb

It seems like Atlassian are a CVE CNA, you can ask them to assign a CVE if you like! (seriously, this is a real vulnerability) https://cve.mitre.org/cve/request_id.html#a …
Any time a stock web browser connects to localhost using HTTPS and doesn't complain about an invalid certificate, your vulnerability spidey senses should be tingling.pic.twitter.com/A04AGNwQSo
Note that Microsoft Edge is apparently quite speedy at picking up that the certificate has been revoked. Google Chrome seems to be fine with it at the moment.pic.twitter.com/5G6vw9zvdo
Also note that this private key isn't too terribly tricky to find. A simple grep in the installed software directory would suffice.pic.twitter.com/iTqtU6EYgb
I suspect that's OCSP, but that doesn't mean very much - an attacker can just drop the queries unless Edge hard fails (which would be very surprising), see this link https://en.wikipedia.org/wiki/Online_Certificate_Status_Protocol#Criticisms …
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