On 8/26/2021 6:16 AM, Paul Claridge wrote:
Hi Team,
I am trying to configure recommendations from a pentest with regard to
excluding weak ciphers.
My ssl labs report shows the following:
Protocols
TLS 1.3 Yes
TLS 1.2 Yes
TLS 1.1 No
TLS 1.0 No
SSL 3 No
SSL 2 No
Cipher Suites
# TLS 1.3 (suites in server-preferred order)
TLS_AES_256_GCM_SHA384 (0x1302) ECDH x25519 (eq. 3072 bits RSA) FS
256
TLS_CHACHA20_POLY1305_SHA256 (0x1303) ECDH x25519 (eq. 3072 bits RSA)
FS 256
TLS_AES_128_GCM_SHA256 (0x1301) ECDH x25519 (eq. 3072 bits RSA) FS
128
# TLS 1.2 (suites in server-preferred order)
TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256 (0xcca8) ECDH x25519 (eq.
3072 bits RSA) FS 256
TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (0xc02f) ECDH x25519 (eq. 3072
bits RSA) FS 128
TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (0xc030) ECDH x25519 (eq. 3072
bits RSA) FS 256
TLS_DHE_RSA_WITH_AES_128_GCM_SHA256 (0x9e) DH 2048 bits FS 128
TLS_DHE_RSA_WITH_AES_256_GCM_SHA384 (0x9f) DH 2048 bits FS 256
TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256 (0xc027) ECDH x25519 (eq. 3072
bits RSA) FS WEAK 128
TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384 (0xc028) ECDH x25519 (eq. 3072
bits RSA) FS WEAK 256
TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA (0xc013) ECDH x25519 (eq. 3072 bits
RSA) FS WEAK 128
TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA (0xc014) ECDH x25519 (eq. 3072 bits
RSA) FS WEAK 256
TLS_DHE_RSA_WITH_AES_128_CBC_SHA256 (0x67) DH 2048 bits FS WEAK
128
TLS_DHE_RSA_WITH_AES_128_CBC_SHA (0x33) DH 2048 bits FS WEAK 128
TLS_DHE_RSA_WITH_AES_256_CBC_SHA256 (0x6b) DH 2048 bits FS WEAK
256
TLS_DHE_RSA_WITH_AES_256_CBC_SHA (0x39) DH 2048 bits FS WEAK 256
TLS_RSA_WITH_AES_128_GCM_SHA256 (0x9c) WEAK 128
TLS_RSA_WITH_AES_256_GCM_SHA384 (0x9d) WEAK 256
TLS_RSA_WITH_AES_128_CBC_SHA256 (0x3c) WEAK 128
TLS_RSA_WITH_AES_256_CBC_SHA256 (0x3d) WEAK 256
TLS_RSA_WITH_AES_128_CBC_SHA (0x2f) WEAK 128
TLS_RSA_WITH_AES_256_CBC_SHA (0x35) WEAK 256
My current ssl.conf is as follows:
<IfModule mod_ssl.c>
# Pseudo Random Number Generator (PRNG):
# Configure one or more sources to seed the PRNG of the SSL library.
# The seed data should be of good random quality.
# WARNING! On some platforms /dev/random blocks if not enough entropy
# is available. This means you then cannot use the /dev/random device
# because it would lead to very long connection times (as long as
# it requires to make more entropy available). But usually those
# platforms additionally provide a /dev/urandom device which doesn't
# block. So, if available, use this one instead. Read the mod_ssl
User
# Manual for more details.
#
SSLRandomSeed startup builtin
SSLRandomSeed startup file:/dev/urandom 512
SSLRandomSeed connect builtin
SSLRandomSeed connect file:/dev/urandom 512
##
## SSL Global Context
##
## All SSL configuration in this context applies both to
## the main server and all SSL-enabled virtual hosts.
##
#
# Some MIME-types for downloading Certificates and CRLs
#
AddType application/x-x509-ca-cert .crt
AddType application/x-pkcs7-crl .crl
# Pass Phrase Dialog:
# Configure the pass phrase gathering process.
# The filtering dialog program (`builtin' is a internal
# terminal dialog) has to provide the pass phrase on stdout.
SSLPassPhraseDialog exec:/usr/share/apache2/ask-for-passphrase
# Inter-Process Session Cache:
# Configure the SSL Session Cache: First the mechanism
# to use and second the expiring timeout (in seconds).
# (The mechanism dbm has known memory leaks and should not be
used).
#SSLSessionCache dbm:${APACHE_RUN_DIR}/ssl_scache
SSLSessionCache shmcb:${APACHE_RUN_DIR}/ssl_scache(512000)
SSLSessionCacheTimeout 300
SSLSessionTickets off
# Semaphore:
# Configure the path to the mutual exclusion semaphore the
# SSL engine uses internally for inter-process synchronization.
# (Disabled by default, the global Mutex directive consolidates by
default
# this)
#Mutex file:${APACHE_LOCK_DIR}/ssl_mutex ssl-cache
# SSL Cipher Suite:
# List the ciphers that the client is permitted to negotiate.
See the
# ciphers(1) man page from the openssl package for list of all
available
# options.
# Enable only secure ciphers:
#SSLCipherSuite
HIGH:!aNULL:!ECDHE_RSA_WITH_AES_128_CBC_SHA256:!ECDHE_RSA_WITH_AES_256_CBC_SHA384:!ECDHE_RSA_WITH_AES_128_CBC_SHA:!ECDHE_RSA_WITH_AES_256_CBC_SHA:!DHE_RSA_WITH_AES_128_CBC_SHA256:!DHE_RSA_WITH_AES_128_CBC_SHA:!DHE_RSA_WITH_AES_256_CBC_SHA256:!DHE_RSA_WITH_AES_256_CBC_SHA:!RSA_WITH_AES_128_GCM_SHA256:!RSA_WITH_AES_256_GCM_SHA384:!RSA_WITH_AES_128_CBC_SHA256:!RSA_WITH_AES_256_CBC_SHA256:!RSA_WITH_AES_128_CBC_SHA:!RSA_WITH_AES_256_CBC_SHA
#SSLCipherSuite
EECDH+AESGCM:EDH+AESGCM:AES256+EECDH:ECDHE-RSA-AES128-SHA:DHE-RSA-AES128-GCM-SHA256:AES256+EDH:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES128-SHA256:ECDHE-RSA-AES256-SHA:DHE-RSA-AES256-SHA256:DHE-RSA-AES128-SHA256:DHE-RSA-AES256-SHA:DHE-RSA-AES128-SHA:ECDHE-RSA-DES-CBC3-SHA:EDH-RSA-DES-CBC3-SHA:AES256-GCM-SHA384:AES128-GCM-SHA256:AES256-SHA256:AES128-SHA256:AES256-SHA:AES128-SHA:DES-CBC3-SHA:HIGH:!aNULL:!eNULL:!EXPORT:!DES:!MD5:!PSK:!RC4
SSLCipherSuite
ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256
# SSL server cipher order preference:
# Use server priorities for cipher algorithm choice.
# Clients may prefer lower grade encryption. You should enable this
# option if you want to enforce stronger encryption, and can afford
# the CPU cost, and did not override SSLCipherSuite in a way that
puts
# insecure ciphers first.
# Default: Off
SSLHonorCipherOrder on
# The protocols to enable.
# Available values: all, SSLv3, TLSv1, TLSv1.1, TLSv1.2
# SSL v2 is no longer supported
SSLProtocol all -SSLv3 -TLSv1 -TLSv1.1 -TLSv1.2
# Allow insecure renegotiation with clients which do not yet
support
the
# secure renegotiation protocol. Default: Off
#SSLInsecureRenegotiation on
# Whether to forbid non-SNI clients to access name based virtual
hosts.
# Default: Off
#SSLStrictSNIVHostCheck On
SSLCompression off
</IfModule>
As you can see I have tried several SSLCipherSuite options, but I cannot
remove those weak ciphers from my report (thereby failing my pentest).
It seems to me that the -TLSv1.2 is being ignored possibly?
I'm at a loss, so would appreciate some advice on how to configure this
please?
Thanks, Paul
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Without examining all the ciphers you list in SSLCipherSuite, just
taking a step back at:
SSLProtocol all -SSLv3 -TLSv1 -TLSv1.1 -TLSv1.2
which disables TLSv1.2 protocol.
You state your SSL Labs report indicates:
TLS 1.2 Yes
So something doesn't seem right there.
Did you restart your apache server after the SSL config changes?
Do you perhaps have a WAF/reverse proxy sitting in front of your apache
server that also needs to be configured?
Jim
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