@jsing You may well be correct that the server was incorrectly configured, unfortunately it was a Windows server managed by a third party and I don't know precisely how it was set up. Given that the cert in question was issued on 9th September 2021 I suspect it was a misconfiguration of their intermediate cert they were sending.
-- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to ca-certificates in Ubuntu. https://bugs.launchpad.net/bugs/1944481 Title: Distrust "DST Root CA X3" Status in ca-certificates package in Ubuntu: Fix Committed Status in ca-certificates source package in Trusty: Fix Released Status in ca-certificates source package in Xenial: Fix Released Status in ca-certificates source package in Bionic: Fix Released Status in ca-certificates source package in Focal: Fix Released Status in ca-certificates source package in Hirsute: Fix Released Status in ca-certificates source package in Impish: Fix Committed Bug description: [Impact] * ca-certificates trusts the letsencrypt CA certificate "ISRG Root X1" * ca-certificates also trusts the CA certificate "DST Root CA X3" which cross-signs letencrypt CA * "DST Root CA X3" is about to expire, however it has issued an updated cross-signature to letsencrypt beyond its own expiry * This causes issues with older implementations of openssl & gnutls that reject such chains when offered to clients by servers. * We have provided fixes for openssl in xenial and gnutls in bionic/xenial, however trusty systems remain affected. Also any self built old copies of openssl/gnutls remain suspeptible to this expiry. * One solution is to blacklist the "DST Root CA X3" from the ca-certificates package as described at https://blog.devgenius.io/rhel-centos-7-fix-for-lets-encrypt-change-8af2de587fe4 - connectivity to sites chained to "DST Root CA X3" will be unaffected, and servers that chain to both "ISRG Root X1" and "DST Root CA X3" should start to work unmodified. * This is similar to how this was handled for AddTrust before "* mozilla/blacklist.txt: blacklist expired AddTrust External Root CA." [Test Plan] * Install old/current ca-certificates faketime wget curl libcurl3-gnutls # faketime 2021-10-01 wget https://pskov.surgut.co.uk --2021-10-01 00:00:00-- https://pskov.surgut.co.uk/ Resolving pskov.surgut.co.uk (pskov.surgut.co.uk)... 2a01:4f8:c17:3dd8::1, 49.12.37.5 Connecting to pskov.surgut.co.uk (pskov.surgut.co.uk)|2a01:4f8:c17:3dd8::1|:443... connected. ERROR: cannot verify pskov.surgut.co.uk's certificate, issued by '/C=US/O=Let\'s Encrypt/CN=R3': Issued certificate has expired. To connect to pskov.surgut.co.uk insecurely, use `--no-check-certificate'. # LD_PRELOAD=/usr/lib/x86_64-linux-gnu/libcurl-gnutls.so.4 faketime 2021-10-01 curl https://pskov.surgut.co.uk >/dev/null % Total % Received % Xferd Average Speed Time Time Time Current Dload Upload Total Spent Left Speed 0 0 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 0 curl: (60) SSL certificate problem: certificate has expired * Install new ca-certificates package # faketime 2021-10-01 wget https://pskov.surgut.co.uk --2021-10-01 00:00:00-- https://pskov.surgut.co.uk/ Resolving pskov.surgut.co.uk (pskov.surgut.co.uk)... 2a01:4f8:c17:3dd8::1, 49.12.37.5 Connecting to pskov.surgut.co.uk (pskov.surgut.co.uk)|2a01:4f8:c17:3dd8::1|:443... connected. HTTP request sent, awaiting response... 200 OK Length: 612 [text/html] Saving to: 'index.html.3' 100%[====================================================>] 612 --.-K/s in 0s 2021-10-01 00:00:00 (71.7 MB/s) - 'index.html.3' saved [612/612] LD_PRELOAD=/usr/lib/x86_64-linux-gnu/libcurl-gnutls.so.4 faketime 2021-10-01 curl https://pskov.surgut.co.uk >/dev/null % Total % Received % Xferd Average Speed Time Time Time Current Dload Upload Total Spent Left Speed 100 612 100 612 0 0 5794 0 --:--:-- --:--:-- --:--:-- 5828 Download is successful. [Where problems could occur] * Connectivity to "DST Root CA X3" websites only, even under faketime set to dates prior to 30th of September 2021 will not work, as "DST Root CA X3" certificate is no longer installed. users should locally install and enable that CA certificate, or allow dangerous unverified connectivity to websites using expired CA certs. [Other Info] * Related openssl and gnutls28 bugs are https://bugs.launchpad.net/ubuntu/+source/openssl/+bug/1928989 and https://bugs.launchpad.net/ubuntu/+source/gnutls28/+bug/1928648 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ca-certificates/+bug/1944481/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
