作者： 白翼

发布于

Security Bulletin 2024-07-02

a) regreSSHion, CVE-2024-6387, is an unauthenticated remote code execution in OpenSSH’s server (sshd) that grants full root access. It affects the default configuration and does not require user interaction. It poses a significant exploit risk. [link]

Debian 12 users are advised to upgrade to 1:9.2p1-2+deb12u3 immediately. [link]

b) NGINX PGP Signing Key is updated, all NGINX repository users are required to import the new keys. [link]

发布于

Just for fun: Now using BigQuery to import my credit card bills and analyze them, lol. (And the higest went to Uber Eats with no competition…)

SELECT
  shop,
  FORMAT_DATE('%Y-%m', date) ym,
  SUM(amount) as `count`
FROM `credit_csvs.utf-8`
GROUP BY ym, shop
ORDER BY count DESC

Replacing my Python analyzing script so I can just focus on adding more complex queries for future uses.

发布于

Interesting findings that for emails sent to Proofpoint protected MX, they might get rejected if the source domain has a stronger DMARC policy, e.g. strict DKIM alignment.

https://help.proofpoint.com/Proofpoint_Essentials/Email_Security/Administrator_Topics/Other_Features/Why_does_DKIM_fail

It all begins with a DMARC report I received from Outlook…

<policy_evaluated>
<disposition>none</disposition>
<dkim>fail</dkim>
<spf>pass</spf>
</policy_evaluated>

I was then eager to find out why DKIM failed in this case, and did some tests with a domain that has its MX pointed to pphosted servers. In the end, I was able to reproduce the issue with a URL link in my email so that it will be rewritten to URL Defense link, as a result, the email body was modified, and resulted in dkim=fail (body hash did not verify).

发布于

Next stop: ClouDNS?

With Digicert’s acquisition of DNS Made Easy (DNSME), DNSME has since hiked up their pricing for 25 zones from $75.00 to an astonishing $675 (Annual).

To be fair, existing users (legacy Business plan) only got a small bump from $75.00 to $96.00/yr, but, who knows how long that can last?

Since then I’ve been thinking about where I should migrate my DNS to after my contract with DNSME is due. I thought about building my own DNS clusters but it is just not worth it to spun up VMs around the world myself. Amazon Route 53 has been my first choice but recently I find that ClouDNS is not just a free DNS service as I always thought, they also offer Premium DNS. Duh.

So far, ClouDNS seems to tick all my boxes:

– Anycast DNS, with PoPs in Asia (Hong Kong, Taiwan, Japan)
– Low TTL value (Would love to have as low as 1s, but 60s will do, as most recursive DNS does not respect a value lower than that anyway)
– DNSSEC support (Suck it Digicert DNSME for only providing DNSSEC on their $2100/yr plan)
– Super reasonable pricing (Premium M, 75 zones for only $54.45/yr, that’s a bargain)
– White-label support (Even with an option to upgrade to dedicated IPs and PTRs for only $25/month, damn)

One worry is that I did not find any documents mentioning the DNS propagation speed for ClouDNS’ zone records.

Will definitely be evaluating that and more as soon as I reach my last contracted year with DNSME 🙂