Debian 10 cURL error:141A318A:SSL routines:tls_process_ske_dhe:dh key too small

Después de actualizar cURL ya no es posible descargar datos de ciertos sitios, en el log de PHP aparece una larga lista:

 Expire in 2 ms for 1 (transfer 0x5566aa0c0630)
* Expire in 0 ms for 1 (transfer 0x5566aa0c0630)
* Expire in 0 ms for 1 (transfer 0x5566aa0c0630)
* Expire in 2 ms for 1 (transfer 0x5566aa0c0630)
* Expire in 0 ms for 1 (transfer 0x5566aa0c0630)
* Expire in 0 ms for 1 (transfer 0x5566aa0c0630)
* Expire in 2 ms for 1 (transfer 0x5566aa0c0630)
* Expire in 0 ms for 1 (transfer 0x5566aa0c0630)
* Expire in 0 ms for 1 (transfer 0x5566aa0c0630)
* Expire in 2 ms for 1 (transfer 0x5566aa0c0630)
* Expire in 0 ms for 1 (transfer 0x5566aa0c0630)
* Expire in 0 ms for 1 (transfer 0x5566aa0c0630)
* Expire in 2 ms for 1 (transfer 0x5566aa0c0630)
* Expire in 0 ms for 1 (transfer 0x5566aa0c0630)
* Expire in 0 ms for 1 (transfer 0x5566aa0c0630)
* Expire in 2 ms for 1 (transfer 0x5566aa0c0630)
* Expire in 0 ms for 1 (transfer 0x5566aa0c0630)
* Expire in 0 ms for 1 (transfer 0x5566aa0c0630)
* Expire in 2 ms for 1 (transfer 0x5566aa0c0630)
* Expire in 0 ms for 1 (transfer 0x5566aa0c0630)
* Expire in 0 ms for 1 (transfer 0x5566aa0c0630)
* Expire in 2 ms for 1 (transfer 0x5566aa0c0630)
* Expire in 0 ms for 1 (transfer 0x5566aa0c0630)
* Expire in 0 ms for 1 (transfer 0x5566aa0c0630)
* Expire in 2 ms for 1 (transfer 0x5566aa0c0630)
* Expire in 0 ms for 1 (transfer 0x5566aa0c0630)
* Expire in 0 ms for 1 (transfer 0x5566aa0c0630)
* Expire in 2 ms for 1 (transfer 0x5566aa0c0630)
* Expire in 0 ms for 1 (transfer 0x5566aa0c0630)
* Expire in 0 ms for 1 (transfer 0x5566aa0c0630)
* Expire in 2 ms for 1 (transfer 0x5566aa0c0630)
* Expire in 0 ms for 1 (transfer 0x5566aa0c0630)
* Expire in 0 ms for 1 (transfer 0x5566aa0c0630)
* Expire in 2 ms for 1 (transfer 0x5566aa0c0630)
* Expire in 0 ms for 1 (transfer 0x5566aa0c0630)
* Expire in 0 ms for 1 (transfer 0x5566aa0c0630)
* Expire in 2 ms for 1 (transfer 0x5566aa0c0630)
* Expire in 1 ms for 1 (transfer 0x5566aa0c0630)
* Expire in 1 ms for 1 (transfer 0x5566aa0c0630)
* Expire in 2 ms for 1 (transfer 0x5566aa0c0630)
* Expire in 1 ms for 1 (transfer 0x5566aa0c0630)
* Expire in 1 ms for 1 (transfer 0x5566aa0c0630)
* Expire in 1 ms for 1 (transfer 0x5566aa0c0630)
*   Trying 192.168.121.121...
* TCP_NODELAY set
* Expire in 200 ms for 4 (transfer 0x5566aa0c0630)
* Connected to www.sitewebumnmillon.com (09218.1212.1212.12) port 443 (#0)
* ALPN, offering h2
* ALPN, offering http/1.1
* successfully set certificate verify locations:
*   CAfile: none
  CApath: /etc/ssl/certs
* error:141A318A:SSL routines:tls_process_ske_dhe:dh key too small


Se debe borrar o comentar la opción

CipherString = DEFAULT@SECLEVEL=2

al final del documento en

/etc/ssl/openssl.cnf

como se describe en el bugtracker

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=907788

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