Public bug reported: [Impact]
* openssl fails to talk to letsencrypt website past September 2021, despite trusting the letsencrypt root certificate. [Test Plan] * Import staging cert equivalent to ISRG Root X1 https://letsencrypt.org/certs/staging/letsencrypt-stg-root-x1.pem * Import expired staging cert equivalen tto DST Root CA X3 https://letsencrypt.org/certs/staging/letsencrypt-stg-root-dst.pem * Test connectivity to the expired-root-ca test website https://expired-root-ca-test.germancoding.com setup: apt install openssl wget https://letsencrypt.org/certs/staging/letsencrypt-stg-root-x1.pem wget https://letsencrypt.org/certs/staging/letsencrypt-stg-root-dst.pem cat letsencrypt-stg-root-x1.pem letsencrypt-stg-root-dst.pem >> ca.pem test case: openssl s_client -connect expired-root-ca-test.germancoding.com:443 -servername expired-root-ca-test.germancoding.com -verify 1 -verifyCAfile ca.pem bad result: connection failed good result: connection successful Connection should be successful and trusted with correctly working openssl s_client that can manage to ignore expired CA, and build a valid trust path using non-expired CA in the chain. [Where problems could occur] * Changes as to how the trust paths are built in TLS connection may result in introducing bugs (failure to connect to valid sites) and/or security vulnerabilities (connecting to invalid sites successfully). [Other Info] * Background info * The current chain from letsencrypt is expiring, they are adding a new chain, but also keeping the expiring one. This will result in connectivity issues when using old gnutls/openssl against websites using the default letsencrypt configuration after September 2021. https://community.letsencrypt.org/t/openssl-client-compatibility-changes-for-let-s-encrypt-certificates/143816 https://community.letsencrypt.org/t/questions-re-openssl-client-compatibility-changes-for-let-s-encrypt-certificates/143817 Currently openssl in xenial and earlier will not establish a connection, if any parts of the trust chain have expired, even though alternative non-expired chains are available. This has been fixed in OpenSSL 1.1.0+ by setting X509_V_FLAG_TRUSTED_FIRST by default see https://github.com/openssl/openssl/commit/0daccd4dc1f1ac62181738a91714f35472e50f3c gnutls bug for this is https://bugs.launchpad.net/ubuntu/bionic/+source/gnutls28/+bug/1928648 ** Affects: openssl (Ubuntu) Importance: Undecided Status: Fix Released ** Affects: openssl (Ubuntu Trusty) Importance: Undecided Status: New ** Affects: openssl (Ubuntu Xenial) Importance: Undecided Status: New ** Tags: letsencrypt ** Also affects: openssl (Ubuntu Trusty) Importance: Undecided Status: New ** Also affects: openssl (Ubuntu Xenial) Importance: Undecided Status: New ** Changed in: openssl (Ubuntu) Status: New => Fix Released -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to openssl in Ubuntu. https://bugs.launchpad.net/bugs/1928989 Title: expiring trust anchor compatibility issue Status in openssl package in Ubuntu: Fix Released Status in openssl source package in Trusty: New Status in openssl source package in Xenial: New Bug description: [Impact] * openssl fails to talk to letsencrypt website past September 2021, despite trusting the letsencrypt root certificate. [Test Plan] * Import staging cert equivalent to ISRG Root X1 https://letsencrypt.org/certs/staging/letsencrypt-stg-root-x1.pem * Import expired staging cert equivalen tto DST Root CA X3 https://letsencrypt.org/certs/staging/letsencrypt-stg-root-dst.pem * Test connectivity to the expired-root-ca test website https://expired-root-ca-test.germancoding.com setup: apt install openssl wget https://letsencrypt.org/certs/staging/letsencrypt-stg-root-x1.pem wget https://letsencrypt.org/certs/staging/letsencrypt-stg-root-dst.pem cat letsencrypt-stg-root-x1.pem letsencrypt-stg-root-dst.pem >> ca.pem test case: openssl s_client -connect expired-root-ca-test.germancoding.com:443 -servername expired-root-ca-test.germancoding.com -verify 1 -verifyCAfile ca.pem bad result: connection failed good result: connection successful Connection should be successful and trusted with correctly working openssl s_client that can manage to ignore expired CA, and build a valid trust path using non-expired CA in the chain. [Where problems could occur] * Changes as to how the trust paths are built in TLS connection may result in introducing bugs (failure to connect to valid sites) and/or security vulnerabilities (connecting to invalid sites successfully). [Other Info] * Background info * The current chain from letsencrypt is expiring, they are adding a new chain, but also keeping the expiring one. This will result in connectivity issues when using old gnutls/openssl against websites using the default letsencrypt configuration after September 2021. https://community.letsencrypt.org/t/openssl-client-compatibility-changes-for-let-s-encrypt-certificates/143816 https://community.letsencrypt.org/t/questions-re-openssl-client-compatibility-changes-for-let-s-encrypt-certificates/143817 Currently openssl in xenial and earlier will not establish a connection, if any parts of the trust chain have expired, even though alternative non-expired chains are available. This has been fixed in OpenSSL 1.1.0+ by setting X509_V_FLAG_TRUSTED_FIRST by default see https://github.com/openssl/openssl/commit/0daccd4dc1f1ac62181738a91714f35472e50f3c gnutls bug for this is https://bugs.launchpad.net/ubuntu/bionic/+source/gnutls28/+bug/1928648 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/openssl/+bug/1928989/+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
