[tech] FW: [Cloudflare - Action Required] Upcoming Let's Encrypt certificate chain change

Mon May 6 11:58:21 AWST 2024

Hi all, please see below the email from Cloudflare.

Below we had identified the following domains/hosts in Cloudflare that are using SSL/TLS -> Edge Certificates created using Let’s Encrypt Certificate Authority (CA). These will need to be updated to use Google Trust Services CA. In addition,  please advise if the following information needs updating. This will need to be actioned by September 30th, 2024 to ensure that there is no disruption to your services using the Let’s Encrypt CA.

Thanks

Account
Domain\Host
Owner
Contacts
Email
Action
ICRAR
Icrar.org
ICRAR
Mark Boulton
mark.boulton at uwa.edu.au
Owner to make change, UniIT can assist if required

Mwa-web.icrar.org
 ICRAR

Owner to make change, UniIT can assist if required

LEI
Lei.org.au
LEI
Alex Sardelich
AlexSardelich at lei.org.au
Owner to make change, UniIT can assist if required

SHL
Systemhealthlab.com
ECM
Melinda Hodkiewicz,
Caitlin Woods,
Chantelle Kerr,
Frinze Lapuz
melinda.hodkiewicz at uwa.edu.au,
caitlin.woods at research.uwa.edu.au,
chantelle.kerr at uwa.edu.au
frinze.lapuz at uwa.edu.au
Owner to make change, UniIT can assist if required

Tailingsmonitoring.com
ECM
Christina Vulpe,
Tim Sercombe,
Frinze Lapuz
frinze.lapuz at uwa.edu.au
Owner to make change, UniIT can assist if required

TISC
Tisc.edu.au
TISC
Terry Bhatti
terry at tisc.edu.au
Owner to make change, UniIT can assist if required

UWA-Associates
Ihp-wa.org.au
HMS
Dimitris Matsakidis
dimitris.matsakidis at uwa.edu.au
No action required, UniIT will make the change

Portal-wa.org.au
HMS

No action required, UniIT will make the change

Sysgen.org
Perkins
Grant Morahan,
Bek Brittain
grant.morahan at perkins.org.au,
bek.brittain at perkins.uwa.edu.au
No action required, UniIT will make the change

wacha.org.au
HMS
Leon Flicker,
Christopher Etherton-Beer,
Zoe Hyde
leon.flicker at uwa.edu.au,
christopher.etherton-beer at uwa.edu.au,
zoe.hyde at uwa.edu.au
No action required, UniIT will make the change

Honeybeehealthresearch.org
SCI
Owen Duncan,
Ian Castleden
owen.duncan at uwa.edu.au,
ian.castleden at uwa.edu.au
No action required, UniIT will make the change

Pelicanmagazine.com.au
Guild
Kelvin Lee
kelvin.lee at guild.uwa.edu.au
No action required, UniIT will make the change

UWA-UCC
Ucc.asn.au
UCC
Gary O'Donovan,
James Arcus,
John Hodge,
Matt Johnston
tpg at ucc.asn.au,
tech at ucc.asn.au,
wheel at ucc.asn.au
Owner to make change, UniIT can assist if required

Ucc.guild.uwa.edu.au
UCC
Gary O'Donovan,
James Arcus,
John Hodge,
Matt Johnston
tpg at ucc.asn.au,
tech at ucc.asn.au,
wheel at ucc.asn.au
Owner to make change, UniIT can assist if required

From: Cloudflare <em at em1.cloudflare.com<mailto:em at em1.cloudflare.com>>
Sent: Saturday, March 16, 2024 1:02 AM
To: Steven Lim <90103773 at uwa.edu.au<mailto:90103773 at uwa.edu.au>>
Subject: [Cloudflare - Action Required] Upcoming Let's Encrypt certificate chain change

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Upcoming Let's Encrypt certificate chain change

Hi,

We are reaching out to inform you about an upcoming change that will impact the device compatibility of Let’s Encrypt certificates issued after May 15th, 2024. We are reaching out to you because we identified that you are currently using Let’s Encrypt certificates through Universal SSL, Advanced Certificate Manager, Custom Certificates, or SSL for SaaS. We recommend that you familiarize yourself with the Let’s Encrypt change and make any necessary adjustments ahead of time.

Change Overview

Let’s Encrypt issues certificates through two chains: the ISRG Root X1 chain and the ISRG Root X1 chain cross-signed by IdenTrust’s DST Root CA X3. The cross-signed chain has allowed Let’s Encrypt certificates to become widely trusted, while the pure chain developed compatibility with various devices over the last 3 years, growing the number of Android devices trusting ISRG Root X1 from 66% to 93.9%.

Let’s Encrypt announced<https://links1.cloudflare.com/u/click?_t=4d37ee5dc20f46da9035f25c66794274&_m=3a7de2fb25044e479e902421fb7aebe6&_e=jTN0AnnSxdgTdtl9j19lQwiai0ftWmiPvvAeWTXRc0bqzNwgRO5EzosWuxWwUUDGWUUCcefJ3e5YwIWJtMzdOme0e3AJY0USQzxbmZJIALBA77KJJQZ255kEJ9vv4proRmxVq3mhpLPiF8Ct_v_3gaaj1K_xTaYfEpqiOU5dCa40ZFe7rTBxE-ULYLHaEmkzbQ3W3DITG4Zkz5sc0fufurasQwT37ovS3-4QxddiFe8IPObaDeJOXdAYQpc7spD1nHJ1q0JWw424NnRbU2clwXutrKOqDlkgR4weyjZh8v5z8NVth8c5EfppjpHrxdRzxeiXTx96Ch8ifijpUt7OVQ-9QoVUuA95Kk1pE3-Msao%3D> that the cross-signed chain is set to expire on September 30th, 2024. As a result, Cloudflare will stop issuing certificates from the cross-signed CA chain on May 15th, 2024.

Impact

The expiration of the cross-signed chain will primarily affect older devices (e.g. Android 7.0 and earlier) and systems that solely rely on the cross-signed chain and lack the ISRG Root X1 chain in their trust store. This change could result in certificate validation failures on these devices, potentially leading to warning messages or access problems for users visiting your website.

Impact to certificates issued through Universal SSL, Advanced Certificate Manager, or SSL for SaaS:

To prepare for the CA expiration, after May 15th, Cloudflare will no longer issue certificates from the cross-signed chain. Certificates issued before May 15th will continue to be served to clients with the cross-signed chain. Certificates issued on May 15th or after will use the ISRG Root X1 chain. Additionally, this change only impacts RSA certificates. It does not impact ECDSA certificates issued through Let’s Encrypt. ECDSA certificates will maintain the same level of compatibility that they have today.

Impact to certificates uploaded through Custom Certificates:

Certificates uploaded to Cloudflare are bundled with the certificate chain that Cloudflare finds to be the most compatible and efficient. After May 15th, 2024, all Let’s Encrypt certificates uploaded to Cloudflare will be bundled with the ISRG Root X1 chain, instead of the cross-signed chain. Certificates uploaded before May 15th will continue to use the cross-signed chain until that certificate is renewed.

Important Dates

May 15th, 2024: Cloudflare will stop issuing certificates from the cross-signed CA chain. In addition,  Let’s Encrypt Custom Certificates uploaded after this date will be bundled with the ISRG X1 chain instead of the cross-signed chain.

September 30th, 2024: The cross-signed CA chain will expire.

Recommendations:

To reduce the impact of this change, we recommend taking the following steps:

  1.  Change CAs: If your customers are making requests to your application from legacy devices and you expect that this change will impact them, then we recommend using a different certificate authority<https://links1.cloudflare.com/u/click?_t=4d37ee5dc20f46da9035f25c66794274&_m=3a7de2fb25044e479e902421fb7aebe6&_e=jTN0AnnSxdgTdtl9j19lQ-PruW_YdiMQ6Z4WphgpYJJo-EFlI1uvc8LCRnSIIdOOXc_IjwTSWNePiroWhVEPvkMeAgczs0d-i4b2TtyBS9WBH55Fp2pV-jApifXHcwz2tEfwpALrZ_kYWmBe4zOEpHDhQsgljASIWfiextzJNXZcdiXyBIsMLFds-qZgOfrsAIIp20Z-6ui4tM0X2nqaNXHuQJHJl9EuhE1UWZC5m0-1nBnnP0E28A76FxxDQUfXFNVLBe4UR5FVpj5vCNdtp6CdtyAyTYCRsyvk7eCzeGvqAs3eu-QYrxmIHAzlTJGXwYiNqF6yEVpH-bhTw9QBoVkC8vfLw42vOgp_zR4RZu8tq6bWzrbfSBNH33v7yMsr> or uploading a certificate<https://links1.cloudflare.com/u/click?_t=4d37ee5dc20f46da9035f25c66794274&_m=3a7de2fb25044e479e902421fb7aebe6&_e=jTN0AnnSxdgTdtl9j19lQ-PruW_YdiMQ6Z4WphgpYJJo-EFlI1uvc8LCRnSIIdOOXc_IjwTSWNePiroWhVEPvpKCeL39cO2hdQ4Zl0MLwF6aGBY-SC3gpZ64-mA6ngZwWdwc2pmKUl3_JGuLxuo92umj2PD05jsW_O9cj7GN13IRhg-Wog8UEWeWkZsYCMAeCfjreomihhkmd7YnFYKkhJCVas8dI-hQvtUrXHtzS0V3AC8l0NUuoNQFlWGaqb1Q2HzPiLAUe3ize8z3zpOgko_27nY0n3yseRpqMKBLT8mkdFNfdsgenvlBDI6iULaKdVP9nJ-nsE7UC1A4TcwrEenJZmICvp1myJi1SM1DxSouEQGDqVQYKg-Lb18lQBKH> from the CA of your choice.
  2.  Monitoring: Once the change is rolled out, we recommend monitoring your support channels for any inquiries related to certificate warnings or access problems.
  3.  Update Trust Store: If you control the clients that are connecting to your application, we recommend upgrading the trust store to include the ISRG Root X1 chain to prevent impact.

If you have any questions, we recommend that you refer to our Developer Documentation<https://links1.cloudflare.com/u/click?_t=4d37ee5dc20f46da9035f25c66794274&_m=3a7de2fb25044e479e902421fb7aebe6&_e=jTN0AnnSxdgTdtl9j19lQ-PruW_YdiMQ6Z4WphgpYJIaziC4S_bs36oqx9uzN3EVmgitXF6yetoWv-MKaG3sB4hAb9es1vw0jLQL8JQabRbXKjT_hS16smPCYX-08FfWD6XO7EEkpzAzRwruBPTPXF5UeQhwa0_6Q-smumbLKBLzLL-jiMTxW2DWEyKqMj_6LIT7HV800AWjh2Lu6OQ_QN1s8b4zlySFlbTapaHmQKsuMFwlyOUPiSK73Qs3M-qBkpymmQiZSrJLeCy3zfmnvx7HcgnBcqMILl6Zbe3mSdpQum19U3E3dtc28AeOZzfoxErhbcmpa9apEHlkD_mRLYyyjVw3Qv55qMfwysLcYdO95Nk39q0pCMjbnDO5EJ7-> or blog post<https://links1.cloudflare.com/u/click?_t=4d37ee5dc20f46da9035f25c66794274&_m=3a7de2fb25044e479e902421fb7aebe6&_e=jTN0AnnSxdgTdtl9j19lQ49OvPXbX3tNY--XH9Mh8CQt7bQ9_hL2YLLhZgRJLVwhDmmfW8TO8_UJWgD4Y7k-_NpDPbDOAJPJNe9JU77EyDlWZp04pPaydoMfM38cZNQVjRcyiT_CTBd1OAgXdTpetGQ1LDbDOb076fHpB5w-mZMwrKQYKxsdwf5AuDRVZyzFOpyouSpMoMULk7mUERQ7ZLKLL-ba_0VQ7LQvAJqWDcYRj0RwqdT4nACxegu-pcUFyzD8zuTffMIdgRbWvsebMLd5IRB6dn0cCrPmJ7nsnknKK0OwJg7tXE6PUBXXl8E4bX0fYLw4MJxDpD0sMJW8zdQg2B6bpqZ9p-16nS_J2ABBeNryR2fzVf28-YM5V50SdeyuxFX62lK-pbAAln3UYAiZA0X3gRvBCA03Epwbbs0%3D> regarding this change.  If you are an Enterprise customer and have additional questions or concerns, please reach out to your Account Team.
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