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The Internet goes on high alert after discovery of 8 compromised TLS certs (arstechnica.com)
submitted 21 hours ago* (last edited 20 hours ago) by to c/technology@beehaw.org
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Astonishingly, the private keys were 4, 56, 66, 115, 155, 156, 230, 237.

exploiting compromised certificates requires an active adversary-in-the-middle attack, meaning the attacker must act as a proxy between two TLS parties and receive encrypted traffic, decrypt it, reencrypt it, and send it to the other party. Such capabilities, in some cases, are usually limited to only the most well-resourced attackers. People with control of a local network—at a coffee shop, university, or other organization—face much less of a challenge.

https://emudhra.we-have-a-problem.com/

Xkcd 221: int getRandomNumber() { return 4; // chosen by fair dice roll. guaranteed to be random. }

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[–] 9 points 11 hours ago (1 child)

exploiting compromised certificates requires an active adversary-in-the-middle attack, meaning the attacker must act as a proxy between two TLS parties and receive encrypted traffic, decrypt it, reencrypt it, and send it to the other party. Such capabilities, in some cases, are usually limited to only the most well-resourced attackers.

What? Which dumbass wrote this? A 10yo skiddie can do this with a simple enforced proxy on an open WiFi AP.

I could literally grab a travel router, use the already installed OpenWrt on it, and deploy a sniffer that proxies all traffic, and for any traffic using the specific keys that leaked... unpack and repack those requests and responses on the fly.

I love how they're trying to downplay this.

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  • [–] [S] 1 point 1 hour ago* (last edited 1 hour ago)

    none of these intermediate CAs, including the one deployed in production, have issued any end-entity certificates. This has been confirmed through our internal analysis and corroborated by publicly available Certificate Transparency records on crt.sh.

    —https://emudhra.com/en/post/certificate-security-incident

    so no, there is no “traffic using the specific keys that leaked” and hence your attack wouldn’t yield anything, but one could use these certificates to reencrypt and impersonate

    i’ll also note that you excluded the last sentence of the paragraph you quoted, which makes clear that “some cases” refers to cases other than the case at hand

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