youtube-dl: yt-dl.org (YouTube-DL main Hosting Site) broken certificate

Checklist

I’m reporting a broken site support issue
I’ve verified that I’m running youtube-dl version 2020.05.29
I’ve checked that all provided URLs are alive and playable in a browser
I’ve checked that all URLs and arguments with special characters are properly quoted or escaped
I’ve searched the bugtracker for similar bug reports including closed ones
I’ve read bugs section in FAQ

Verbose log

wget https://yt-dl.org/downloads/latest/youtube-dl

--2020-06-01 10:50:40--  https://yt-dl.org/downloads/latest/youtube-dl
Resolving yt-dl.org (yt-dl.org)... 95.143.172.170
Connecting to yt-dl.org (yt-dl.org)|95.143.172.170|:443... connected.
ERROR: cannot verify yt-dl.org's certificate, issued by ‘CN=COMODO RSA Domain Validation Secure Server CA,O=COMODO CA Limited,L=Salford,ST=Greater Manchester,C=GB’:
  Issued certificate has expired.
To connect to yt-dl.org insecurely, use `--no-check-certificate'.

Description

The main site that hosts the download of the YouTube-DL binary program itself, has an expired security certificate. The error message says:

 "ERROR: cannot verify yt-dl.org's certificate, issued by ‘CN=COMODO RSA Domain Validation Secure Server CA,O=COMODO CA Limited,L=Salford,ST=Greater Manchester,C=GB’:  Issued certificate has expired."

This started occurring on approximately Friday 2020-05-29, though I’m not certain exactly. You can reproduce the issue by typing this command at a bash prompt:

wget https://yt-dl.org/downloads/latest/youtube-dl

This problem affects me, because I do not want to download and use the latest version of YouTube-DL if there is a security risk on the site hosting it.

About this issue

Original URL
State: closed
Created 4 years ago
Comments: 23

Links to this issue

Anyone else not able to update youtube-dl to the latest version?

Commits related to this issue

fix(downloader): add fix for cert issue on macos remove AddTrust entries in /etc/ssl/cert.pem, then we point request to this when making requests. reference https://security.stackexchange.com/questio... — committed to web-mech/node-youtube-dl by web-mech 4 years ago

Most upvoted comments

@dstftw

expired AddTrust External CA Root which is still on your CA store.

Your server (yt-dl.org) is sending the expired intermediate cert (the last one in the below openssl output, “COMODO RSA Certification Authority”), which is what’s causing validation to fail in python. Browsers are evidently smart enough to ignore it, and build an alternate chain, but the python client is not.

 echo q | openssl s_client -connect yt-dl.org:443 -CApath /usr/lib/ssl/certs -showcerts
CONNECTED(00000003)
depth=2 C = GB, ST = Greater Manchester, L = Salford, O = COMODO CA Limited, CN = COMODO RSA Certification Authority
verify return:1
depth=1 C = GB, ST = Greater Manchester, L = Salford, O = COMODO CA Limited, CN = COMODO RSA Domain Validation Secure Server CA
verify return:1
depth=0 OU = Domain Control Validated, OU = PositiveSSL, CN = yt-dl.org
verify return:1
---
Certificate chain
 0 s:OU = Domain Control Validated, OU = PositiveSSL, CN = yt-dl.org
   i:C = GB, ST = Greater Manchester, L = Salford, O = COMODO CA Limited, CN = COMODO RSA Domain Validation Secure Server CA
-----BEGIN CERTIFICATE-----
MIIGPzCCBSegAwIBAgIQMZS8dhHXcUB+Xw/VCtIQ5DANBgkqhkiG9w0BAQsFADCB
kDELMAkGA1UEBhMCR0IxGzAZBgNVBAgTEkdyZWF0ZXIgTWFuY2hlc3RlcjEQMA4G
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TdC1MRnuYlnaCkcYVVyYu1ejGw==
-----END CERTIFICATE-----
 1 s:C = GB, ST = Greater Manchester, L = Salford, O = COMODO CA Limited, CN = COMODO RSA Domain Validation Secure Server CA
   i:C = GB, ST = Greater Manchester, L = Salford, O = COMODO CA Limited, CN = COMODO RSA Certification Authority
-----BEGIN CERTIFICATE-----
MIIGCDCCA/CgAwIBAgIQKy5u6tl1NmwUim7bo3yMBzANBgkqhkiG9w0BAQwFADCB
hTELMAkGA1UEBhMCR0IxGzAZBgNVBAgTEkdyZWF0ZXIgTWFuY2hlc3RlcjEQMA4G
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-----END CERTIFICATE-----
 2 s:C = GB, ST = Greater Manchester, L = Salford, O = COMODO CA Limited, CN = COMODO RSA Certification Authority
   i:C = SE, O = AddTrust AB, OU = AddTrust External TTP Network, CN = AddTrust External CA Root
-----BEGIN CERTIFICATE-----
MIIFdDCCBFygAwIBAgIQJ2buVutJ846r13Ci/ITeIjANBgkqhkiG9w0BAQwFADBv
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pu/xO28QOG8=
-----END CERTIFICATE-----

bughit on Jun 5, 2020

@dstftw

you have to stop sending the expired intermediate cert because your own python client can’t handle it

https://www.agwa.name/blog/post/fixing_the_addtrust_root_expiration

Fortunately, modern clients with well-written certificate validators (this includes all mainstream web browsers) won’t have a problem with the expiration. Since they trust the USERTrust RSA Certification Authority root, they will build a chain to that root and ignore the fact that the server sent an expired intermediate certificate.

Other clients, notably anything using OpenSSL 1.0.x or GnuTLS, will have a problem. Even if these clients trust the USERTrust RSA Certification Authority root, and could build a chain to it if they wanted, they’ll end up building a chain to AddTrust External CA Root instead, causing the certificate validation to fail with an expired certificate error.

Fixing this problem as a server operator Basically, you need to remove the intermediate certificate issued by AddTrust External CA Root from your certificate chain.

bughit on Jun 5, 2020

Same problem on my raspi (Raspbian Jessie), even after running update-ca-certificates. I worked around this by using the wget download line with --no-check-certificate, but that’s not a real fix - please make sure that you use a certificate which is valid out of the box for all OSes including old ones, without requiring users to mess up with CAs.

vbertola on Sep 5, 2020

I’d argue this issue should be reopened. As it is, I cannot install youtube-dl using the curl or wget commands provided in the download page.

With Curl:

curl: (60) SSL certificate problem: certificate has expired

With wget:

ERROR: The certificate of ‘yt-dl.org’ is not trusted. ERROR: The certificate of ‘yt-dl.org’ has expired.

A workaround that every user needs to apply is not a fix.

Seblor on Sep 6, 2020