Re: nmap does not list ciphers consistently

Daniel Miller <[email protected]> Sat, 20 Jan 2018 14:12:26 -0600
Newsgroups	gmane.comp.security.nmap.devel
Message-ID	<CABmvJnPeZ5B0zC4oA9tG7EMYDTcxBRKdDpyijfFqsrYaJNiHOA@mail.gmail.com>
Anil,

Thanks for reporting this. The most useful output would be if you ran the
script with -d to enable debug output. Since we are not interested in the
output of the other scripts, and the "+" means that the script will run
regardless of detected service, do not use the -sV option when collecting
the debug output.

Example: nmap --script +ssl-enum-ciphers -p443 x.x.x.x

Dan

On Wed, Jan 17, 2018 at 4:07 AM, NAYAK, ANIL KUMAR <[email protected]>
wrote:

> Dear Team,
>
> 1. nmap output does not list ciphers available in ALL expected ports
> (not consistent)
> 2. nmap output does not list ciphers against a specific port consistently
>
> Here the appliance/program  runs on Linux  3.10.0-327 (RHEL 7.2)
>
> I need help to explain why it is happening , own script (openssl
> s_client) confirms  that  TLS v1.2 exclusive ciphers are available at
> port
> 443,8443(tomcat) & 5989(cimom), but nmap failed to list it consistently.
>
> Could this happen because nmap does not like certain response from
> target or it is possible that target possibly did not provide the list
> on few attempts (due to firewall etc? ). How to troubleshoot this ?
> Please see the test results below.
>
> Many thanks for any help you may have to offer.  My objective is to
> show(consistent manner) the Ciphers available at Port 443 .
>
> Kind regards,
> Anil.
>
> Outputs: (replaced IP with x.x.x.x)
> -----------
>
> 1.
>
> a. Unsuccessful : (Does not list for ANY ports , subsequently we could
> see the same command was successful on all expected ports)
>
> ANILs-MacBook-Pro:.ssh anil$ nmap  -sV --script +ssl-enum-ciphers x.x.x.x
>
> Starting Nmap 7.60 ( https://nmap.org ) at 2018-01-17 14:39 IST
> Nmap scan report for x.x.x.x
> Host is up (0.0037s latency).
> Not shown: 995 filtered ports
> PORT     STATE SERVICE    VERSION
> 22/tcp   open  ssh        OpenSSH 6.6.1 (protocol 2.0)
> 443/tcp  open  ssl/http   Apache Tomcat/Coyote JSP engine 1.1
> |_http-server-header: Apache-Coyote/1.1
> 3260/tcp open  tcpwrapped
> 8080/tcp open  http       Apache Tomcat/Coyote JSP engine 1.1
> 8443/tcp open  ssl/http   Apache Tomcat/Coyote JSP engine 1.1
> |_http-server-header: Apache-Coyote/1.1
>
> Service detection performed. Please report any incorrect results at
> https://nmap.org/submit/ .
> Nmap done: 1 IP address (1 host up) scanned in 144.95 seconds
>
> b. Successful:  (but this result varies , ciphers gets listed under
> port 443,8443, 5989 ..  but it varies too often)
>
> ANILs-MacBook-Pro:.ssh anil$ nmap  -sV --script +ssl-enum-ciphers x.x.x.x
>
> Starting Nmap 7.60 ( https://nmap.org ) at 2018-01-17 15:21 IST
> Nmap scan report for x.x.x.x
> Host is up (0.0025s latency).
> Not shown: 996 filtered ports
> PORT     STATE SERVICE  VERSION
> 22/tcp   open  ssh      OpenSSH 6.6.1 (protocol 2.0)
> 443/tcp  open  ssl/http Apache Tomcat/Coyote JSP engine 1.1
> |_http-server-header: Apache-Coyote/1.1
> | ssl-enum-ciphers:
> |   TLSv1.2:
> |     ciphers:
> |       TLS_DHE_RSA_WITH_AES_128_GCM_SHA256 (dh 2048) - A
> |       TLS_DHE_RSA_WITH_AES_256_GCM_SHA384 (dh 2048) - A
> |       TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (secp160k1) - A
> |       TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (secp160k1) - A
> |       TLS_RSA_WITH_AES_128_GCM_SHA256 (rsa 2048) - A
> |       TLS_RSA_WITH_AES_256_GCM_SHA384 (rsa 2048) - A
> |     compressors:
> |       NULL
> |     cipher preference: client
> |     warnings:
> |       Key exchange (secp160k1) of lower strength than certificate key
> |_  least strength: A
> 3260/tcp open  iscsi?
> 8443/tcp open  ssl/http Apache Tomcat/Coyote JSP engine 1.1
> |_http-server-header: Apache-Coyote/1.1
> | ssl-enum-ciphers:
> |   TLSv1.2:
> |     ciphers:
> |       TLS_DHE_RSA_WITH_AES_128_GCM_SHA256 (dh 2048) - A
> |       TLS_DHE_RSA_WITH_AES_256_GCM_SHA384 (dh 2048) - A
> |       TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (secp160k1) - A
> |       TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (secp160k1) - A
> |       TLS_RSA_WITH_AES_128_GCM_SHA256 (rsa 2048) - A
> |       TLS_RSA_WITH_AES_256_GCM_SHA384 (rsa 2048) - A
> |     compressors:
> |       NULL
> |     cipher preference: client
> |     warnings:
> |       Key exchange (secp160k1) of lower strength than certificate key
> |_  least strength: A
>
> Service detection performed. Please report any incorrect results at
> https://nmap.org/submit/ .
> Nmap done: 1 IP address (1 host up) scanned in 271.48 seconds
>
> 2
> a. Unsuccessful:  It should ideally list the ciphers which it could
> find subsequently (in section b)
>
> ANILs-MacBook-Pro:.ssh anil$ nmap  -sV --script +ssl-enum-ciphers x.x.x.x
> -p 443
>
> Starting Nmap 7.60 ( https://nmap.org ) at 2018-01-17 14:23 IST
> Nmap scan report for x.x.x.x.x
> Host is up (0.0024s latency).
>
> PORT    STATE SERVICE  VERSION
> 443/tcp open  ssl/http Apache Tomcat/Coyote JSP engine 1.1
> |_http-server-header: Apache-Coyote/1.1
>
> Service detection performed. Please report any incorrect results at
> https://nmap.org/submit/ .
> Nmap done: 1 IP address (1 host up) scanned in 19.03 seconds
>
> b. Successful :
>
> ANILs-MacBook-Pro:.ssh anil$ nmap  -sV --script +ssl-enum-ciphers
> x.x.x.x. -p 443
>
> Starting Nmap 7.60 ( https://nmap.org ) at 2018-01-17 14:26 IST
> Nmap scan report for x.x.x.x
> Host is up (0.0020s latency).
>
> PORT    STATE SERVICE  VERSION
> 443/tcp open  ssl/http Apache Tomcat/Coyote JSP engine 1.1
> |_http-server-header: Apache-Coyote/1.1
> | ssl-enum-ciphers:
> |   TLSv1.2:
> |     ciphers:
> |       TLS_DHE_RSA_WITH_AES_128_GCM_SHA256 (dh 2048) - A
> |       TLS_DHE_RSA_WITH_AES_256_GCM_SHA384 (dh 2048) - A
> |       TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (secp160k1) - A
> |       TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (secp160k1) - A
> |       TLS_RSA_WITH_AES_128_GCM_SHA256 (rsa 2048) - A
> |       TLS_RSA_WITH_AES_256_GCM_SHA384 (rsa 2048) - A
> |     compressors:
> |       NULL
> |     cipher preference: client
> |     warnings:
> |       Key exchange (secp160k1) of lower strength than certificate key
> |_  least strength: A
>
> Service detection performed. Please report any incorrect results at
> https://nmap.org/submit/ .
> Nmap done: 1 IP address (1 host up) scanned in 29.75 seconds
> _______________________________________________
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>

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