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Bug#1004086: apache2-bin: mod_ssl ignores SSLOpenSSLConfCmd DHParameters

Package: apache2-bin
Version: 2.4.52-1~deb11u2
Severity: normal

Dear Maintainer,

I use a 4096-bit RSA certificate and corresponding 4096-bit DH parameters generated with

openssl dhparam -outform pem -out /etc/apache2/ssl/dhparam4k.pem 4096

I configured these parameters in Apache with

SSLOpenSSLConfCmd DHParameters /etc/apache2/ssl/dhparam4k.pem

Since the upgrade to Bullseye, these parameters seem to be ignored:
sslscan and ssllabs show that my DHE parameters are only 3072 bits.

When I test the same configuration on a Buster machine the correct 4096 bits are shown.

-- Package-specific info:

-- System Information:
Debian Release: 11.2
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable-security'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 5.10.0-10-amd64 (SMP w/12 CPU threads)
Locale: LANG=en_US.utf8, LC_CTYPE=en_US.utf8 (charmap=UTF-8) (ignored: LC_ALL set to en_US.utf8), LANGUAGE not set
Shell: /bin/sh linked to /bin/dash
Init: sysvinit (via /sbin/init)
LSM: AppArmor: enabled

Versions of packages apache2-bin depends on:
ii  libapr1                  1.7.0-6+deb11u1
ii  libaprutil1              1.6.1-5
ii  libaprutil1-dbd-sqlite3  1.6.1-5
ii  libaprutil1-ldap         1.6.1-5
ii  libbrotli1               1.0.9-2+b2
ii  libc6                    2.31-13+deb11u2
ii  libcrypt1                1:4.4.18-4
ii  libcurl4                 7.74.0-1.3+deb11u1
ii  libjansson4              2.13.1-1.1
ii  libldap-2.4-2            2.4.57+dfsg-3
ii  liblua5.3-0              5.3.3-1.1+b1
ii  libnghttp2-14            1.43.0-1
ii  libpcre3                 2:8.39-13
ii  libssl1.1                1.1.1k-1+deb11u1
ii  libxml2                  2.9.10+dfsg-6.7
ii  perl                     5.32.1-4+deb11u2
ii  zlib1g                   1:1.2.11.dfsg-2

apache2-bin recommends no packages.

Versions of packages apache2-bin suggests:
pn  apache2-doc            <none>
ii  apache2-suexec-custom  2.4.52-1~deb11u2
pn  www-browser            <none>

Versions of packages apache2 depends on:
ii  apache2-data         2.4.52-1~deb11u2
ii  apache2-utils        2.4.52-1~deb11u2
ii  dpkg                 1.20.9
ii  init-system-helpers  1.60
ii  lsb-base             11.1.0
ii  mime-support         3.66
ii  perl                 5.32.1-4+deb11u2
ii  procps               2:3.3.17-5

Versions of packages apache2 recommends:
ii  ssl-cert  1.1.0+nmu1

Versions of packages apache2 suggests:
pn  apache2-doc            <none>
ii  apache2-suexec-custom  2.4.52-1~deb11u2
pn  www-browser            <none>

Versions of packages apache2-bin is related to:
ii  apache2      2.4.52-1~deb11u2
ii  apache2-bin  2.4.52-1~deb11u2

-- no debconf information

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