Vulnerabilities > CVE-2004-0747 - Incorrect Calculation of Buffer Size vulnerability in Apache Http Server

#%NASL_MIN_LEVEL 80502
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Gentoo Linux Security Advisory GLSA 200409-21.
#
# The advisory text is Copyright (C) 2001-2016 Gentoo Foundation, Inc.
# and licensed under the Creative Commons - Attribution / Share Alike 
# license. See http://creativecommons.org/licenses/by-sa/3.0/
#

include("compat.inc");

if (description)
{
  script_id(14766);
  script_version("1.17");
  script_cvs_date("Date: 2019/08/02 13:32:41");

  script_cve_id("CVE-2004-0747", "CVE-2004-0748", "CVE-2004-0751", "CVE-2004-0786", "CVE-2004-0809");
  script_xref(name:"GLSA", value:"200409-21");

  script_name(english:"GLSA-200409-21 : Apache 2, mod_dav: Multiple vulnerabilities");
  script_summary(english:"Checks for updated package(s) in /var/db/pkg");

  script_set_attribute(
    attribute:"synopsis", 
    value:
"The remote Gentoo host is missing one or more security-related
patches."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"The remote host is affected by the vulnerability described in GLSA-200409-21
(Apache 2, mod_dav: Multiple vulnerabilities)

    A potential infinite loop has been found in the input filter of mod_ssl
    (CAN-2004-0748) as well as a possible segmentation fault in the
    char_buffer_read function if reverse proxying to a SSL server is being used
    (CAN-2004-0751). Furthermore, mod_dav, as shipped in Apache httpd 2 or
    mod_dav 1.0.x for Apache 1.3, contains a NULL pointer dereference which can
    be triggered remotely (CAN-2004-0809). The third issue is an input
    validation error found in the IPv6 URI parsing routines within the apr-util
    library (CAN-2004-0786). Additionally a possible buffer overflow has been
    reported when expanding environment variables during the parsing of
    configuration files (CAN-2004-0747).
  
Impact :

    A remote attacker could cause a Denial of Service either by aborting a SSL
    connection in a special way, resulting in CPU consumption, by exploiting
    the segmentation fault in mod_ssl or the mod_dav flaw. A remote attacker
    could also crash a httpd child process by sending a specially crafted URI.
    The last vulnerability could be used by a local user to gain the privileges
    of a httpd child, if the server parses a carefully prepared .htaccess file.
  
Workaround :

    There is no known workaround at this time."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://security.gentoo.org/glsa/200409-21"
  );
  script_set_attribute(
    attribute:"solution", 
    value:
"All Apache 2 users should upgrade to the latest version:
    # emerge sync
    # emerge -pv '>=www-servers/apache-2.0.51'
    # emerge '>=www-servers/apache-2.0.51'
    All mod_dav users should upgrade to the latest version:
    # emerge sync
    # emerge -pv '>=net-www/mod_dav-1.0.3-r2'
    # emerge '>=net-www/mod_dav-1.0.3-r2'"
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:gentoo:linux:apache");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:gentoo:linux:mod_dav");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:gentoo:linux");

  script_set_attribute(attribute:"patch_publication_date", value:"2004/09/16");
  script_set_attribute(attribute:"plugin_publication_date", value:"2004/09/17");
  script_set_attribute(attribute:"vuln_publication_date", value:"2004/09/02");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2004-2019 Tenable Network Security, Inc.");
  script_family(english:"Gentoo Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/Gentoo/release", "Host/Gentoo/qpkg-list");

  exit(0);
}


include("audit.inc");
include("global_settings.inc");
include("qpkg.inc");

if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item("Host/Gentoo/release")) audit(AUDIT_OS_NOT, "Gentoo");
if (!get_kb_item("Host/Gentoo/qpkg-list")) audit(AUDIT_PACKAGE_LIST_MISSING);


flag = 0;

if (qpkg_check(package:"net-www/mod_dav", unaffected:make_list("ge 1.0.3-r2"), vulnerable:make_list("le 1.0.3-r1"))) flag++;
if (qpkg_check(package:"www-servers/apache", unaffected:make_list("ge 2.0.51", "lt 2.0"), vulnerable:make_list("lt 2.0.51"))) flag++;

if (flag)
{
  if (report_verbosity > 0) security_warning(port:0, extra:qpkg_report_get());
  else security_warning(0);
  exit(0);
}
else
{
  tested = qpkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "Apache 2 / mod_dav");
}

#%NASL_MIN_LEVEL 80502
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from the FreeBSD VuXML database :
#
# Copyright 2003-2018 Jacques Vidrine and contributors
#
# Redistribution and use in source (VuXML) and 'compiled' forms (SGML,
# HTML, PDF, PostScript, RTF and so forth) with or without modification,
# are permitted provided that the following conditions are met:
# 1. Redistributions of source code (VuXML) must retain the above
#    copyright notice, this list of conditions and the following
#    disclaimer as the first lines of this file unmodified.
# 2. Redistributions in compiled form (transformed to other DTDs,
#    published online in any format, converted to PDF, PostScript,
#    RTF and other formats) must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer
#    in the documentation and/or other materials provided with the
#    distribution.
# 
# THIS DOCUMENTATION IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
# THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
# OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
# OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
# BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
# OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS DOCUMENTATION,
# EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#

include("compat.inc");

if (description)
{
  script_id(36910);
  script_version("1.10");
  script_cvs_date("Date: 2019/08/02 13:32:36");

  script_cve_id("CVE-2004-0747");

  script_name(english:"FreeBSD : apache -- ap_resolve_env buffer overflow (4d49f4ba-071f-11d9-b45d-000c41e2cdad)");
  script_summary(english:"Checks for updated package in pkg_info output");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote FreeBSD host is missing a security-related update."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"SITIC discovered a vulnerability in Apache 2's handling of
environmental variable settings in the httpd configuration files (the
main `httpd.conf' and `.htaccess' files). According to a SITIC
advisory :

The buffer overflow occurs when expanding ${ENVVAR} constructs in
.htaccess or httpd.conf files. The function ap_resolve_env() in
server/util.c copies data from environment variables to the character
array tmp with strcat(3), leading to a buffer overflow."
  );
  # http://lists.netsys.com/pipermail/full-disclosure/2004-September/026463.html
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?994407f9"
  );
  # https://vuxml.freebsd.org/freebsd/4d49f4ba-071f-11d9-b45d-000c41e2cdad.html
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?7ab21727"
  );
  script_set_attribute(attribute:"solution", value:"Update the affected package.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/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:freebsd:freebsd:apache");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:freebsd:freebsd");

  script_set_attribute(attribute:"vuln_publication_date", value:"2004/09/15");
  script_set_attribute(attribute:"patch_publication_date", value:"2004/09/15");
  script_set_attribute(attribute:"plugin_publication_date", value:"2009/04/23");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2009-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"FreeBSD Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/FreeBSD/release", "Host/FreeBSD/pkg_info");

  exit(0);
}


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


if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item("Host/FreeBSD/release")) audit(AUDIT_OS_NOT, "FreeBSD");
if (!get_kb_item("Host/FreeBSD/pkg_info")) audit(AUDIT_PACKAGE_LIST_MISSING);


flag = 0;

if (pkg_test(save_report:TRUE, pkg:"apache>=2.0<2.0.50_3")) flag++;

if (flag)
{
  if (report_verbosity > 0) security_warning(port:0, extra:pkg_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(14748);
 script_cvs_date("Date: 2018/11/15 20:50:25");
 script_version("1.30");

 script_cve_id("CVE-2004-0747", "CVE-2004-0748", "CVE-2004-0751", "CVE-2004-0786", "CVE-2004-0809");
 script_bugtraq_id(11185, 11187);

 script_name(english:"Apache 2.0.x < 2.0.51 Multiple Vulnerabilities (OF, DoS)");
 
 script_set_attribute(attribute:"synopsis", value:
"The remote web server is affected by multiple vulnerabilities." );
 script_set_attribute(attribute:"description", value:
"According to its Server response header, the remote host is running a
version of Apache 2.0.x prior to 2.0.51. It is, therefore, affected by
multiple vulnerabilities :

  - An input validation issue in apr-util can be triggered
    by malformed IPv6 literal addresses and result in a 
    buffer overflow (CVE-2004-0786).

  - There is a buffer overflow that can be triggered when
    expanding environment variables during configuration
    file parsing (CVE-2004-0747).

  - A segfault in mod_dav_ds when handling an indirect lock
    refresh can lead to a process crash (CVE-2004-0809).

  - A segfault in the SSL input filter can be triggered
    if using 'speculative' mode by, for instance, a proxy
    request to an SSL server (CVE-2004-0751).

  - There is the potential for an infinite loop in mod_ssl
    (CVE-2004-0748)." );
 script_set_attribute(attribute:"see_also", value:"https://bz.apache.org/bugzilla/show_bug.cgi?id=31183" );
 script_set_attribute(attribute:"see_also", value:"https://archive.apache.org/dist/httpd/CHANGES_2.0" );
 script_set_attribute(attribute:"solution", value:"Upgrade to Apache 2.0.51 or later.");
 script_set_cvss_base_vector("CVSS2#AV:N/AC:H/Au:N/C:P/I:P/A:P");
 script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
 script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L");
 script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
 script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
 script_set_attribute(attribute:"exploit_available", value:"true");

 script_set_attribute(attribute:"plugin_publication_date", value: "2004/09/16");
 script_set_attribute(attribute:"vuln_publication_date", value: "2004/07/08");
script_set_attribute(attribute:"plugin_type", value:"remote");
script_set_attribute(attribute:"cpe", value:"cpe:/a:apache:http_server");
script_end_attributes();

 
 summary["english"] = "Checks version of Apache";
 
 script_summary(english:summary["english"]);
 
 script_category(ACT_GATHER_INFO);
 
 script_copyright(english:"This script is Copyright (C) 2004-2018 Tenable Network Security, Inc.");
 script_family(english:"Web Servers");
 script_dependencie("apache_http_version.nasl");
 script_require_keys("installed_sw/Apache");
 script_require_ports("Services/www", 80);
 exit(0);
}

#
# The script code starts here
#
include("global_settings.inc");
include("misc_func.inc");
include("http.inc");
include("audit.inc");
include("install_func.inc");

get_install_count(app_name:"Apache", exit_if_zero:TRUE);
port = get_http_port(default:80);
install = get_single_install(app_name:"Apache", port:port, exit_if_unknown_ver:TRUE);

# Check if we could get a version first, then check if it was
# backported
version = get_kb_item_or_exit('www/apache/'+port+'/version', exit_code:1);
backported = get_kb_item_or_exit('www/apache/'+port+'/backported', exit_code:1);

if (report_paranoia < 2 && backported) audit(AUDIT_BACKPORT_SERVICE, port, "Apache");
source = get_kb_item_or_exit('www/apache/'+port+'/source', exit_code:1);

# Check if the version looks like either ServerTokens Major/Minor
# was used
if (version =~ '^2(\\.0)?$') exit(1, "The banner from the Apache server listening on port "+port+" - "+source+" - is not granular enough to make a determination.");
if (version !~ "^\d+(\.\d+)*$") exit(1, "The version of Apache listening on port " + port + " - " + version + " - is non-numeric and, therefore, cannot be used to make a determination.");
if (version =~ '^2\\.0' && ver_compare(ver:version, fix:'2.0.51') == -1)
{
  if (report_verbosity > 0)
  {
    report = 
      '\n  Version source    : ' + source +
      '\n  Installed version : ' + version +
      '\n  Fixed version     : 2.0.51\n';
    security_warning(port:port, extra:report);
  }
  else security_warning(port);
  exit(0);
}
else audit(AUDIT_LISTEN_NOT_VULN, "Apache", port, install["version"]);

#%NASL_MIN_LEVEL 80502
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Red Hat Security Advisory RHSA-2004:463. The text 
# itself is copyright (C) Red Hat, Inc.
#

include("compat.inc");

if (description)
{
  script_id(14736);
  script_version ("1.28");
  script_cvs_date("Date: 2019/10/25 13:36:10");

  script_cve_id("CVE-2004-0747", "CVE-2004-0751", "CVE-2004-0786", "CVE-2004-0809");
  script_xref(name:"RHSA", value:"2004:463");

  script_name(english:"RHEL 3 : httpd (RHSA-2004:463)");
  script_summary(english:"Checks the rpm output for the updated packages");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote Red Hat host is missing one or more security updates."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"Updated httpd packages that include fixes for security issues are now
available.

The Apache HTTP server is a powerful, full-featured, efficient, and
freely-available Web server.

Four issues have been discovered affecting releases of the Apache HTTP
2.0 Server, up to and including version 2.0.50 :

Testing using the Codenomicon HTTP Test Tool performed by the Apache
Software Foundation security group and Red Hat uncovered an input
validation issue in the IPv6 URI parsing routines in the apr-util
library. If a remote attacker sent a request including a carefully
crafted URI, an httpd child process could be made to crash. This issue
is not believed to allow arbitrary code execution on Red Hat
Enterprise Linux. This issue also does not represent a significant
denial of service attack as requests will continue to be handled by
other Apache child processes. The Common Vulnerabilities and Exposures
project (cve.mitre.org) has assigned the name CVE-2004-0786 to this
issue.

The Swedish IT Incident Centre (SITIC) reported a buffer overflow in
the expansion of environment variables during configuration file
parsing. This issue could allow a local user to gain 'apache'
privileges if an httpd process can be forced to parse a carefully
crafted .htaccess file written by a local user. The Common
Vulnerabilities and Exposures project (cve.mitre.org) has assigned the
name CVE-2004-0747 to this issue.

An issue was discovered in the mod_ssl module which could be triggered
if the server is configured to allow proxying to a remote SSL server.
A malicious remote SSL server could force an httpd child process to
crash by sending a carefully crafted response header. This issue is
not believed to allow execution of arbitrary code. This issue also
does not represent a significant Denial of Service attack as requests
will continue to be handled by other Apache child processes. The
Common Vulnerabilities and Exposures project (cve.mitre.org) has
assigned the name CVE-2004-0751 to this issue.

An issue was discovered in the mod_dav module which could be triggered
for a location where WebDAV authoring access has been configured. A
malicious remote client which is authorized to use the LOCK method
could force an httpd child process to crash by sending a particular
sequence of LOCK requests. This issue does not allow execution of
arbitrary code. This issue also does not represent a significant
Denial of Service attack as requests will continue to be handled by
other Apache child processes. The Common Vulnerabilities and Exposures
project (cve.mitre.org) has assigned the name CVE-2004-0809 to this
issue.

Users of the Apache HTTP server should upgrade to these updated
packages, which contain backported patches that address these issues."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/security/cve/cve-2004-0747"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/security/cve/cve-2004-0751"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/security/cve/cve-2004-0786"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/security/cve/cve-2004-0809"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/errata/RHSA-2004:463"
  );
  script_set_attribute(
    attribute:"solution", 
    value:"Update the affected httpd, httpd-devel and / or mod_ssl packages."
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:httpd");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:httpd-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:mod_ssl");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:3");

  script_set_attribute(attribute:"vuln_publication_date", value:"2004/09/16");
  script_set_attribute(attribute:"patch_publication_date", value:"2004/09/15");
  script_set_attribute(attribute:"plugin_publication_date", value:"2004/09/15");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2004-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"Red Hat Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/RedHat/release", "Host/RedHat/rpm-list", "Host/cpu");

  exit(0);
}


include("audit.inc");
include("global_settings.inc");
include("misc_func.inc");
include("rpm.inc");

if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
release = get_kb_item("Host/RedHat/release");
if (isnull(release) || "Red Hat" >!< release) audit(AUDIT_OS_NOT, "Red Hat");
os_ver = pregmatch(pattern: "Red Hat Enterprise Linux.*release ([0-9]+(\.[0-9]+)?)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Red Hat");
os_ver = os_ver[1];
if (! preg(pattern:"^3([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "Red Hat 3.x", "Red Hat " + os_ver);

if (!get_kb_item("Host/RedHat/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);

cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$" && "s390" >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "Red Hat", cpu);

yum_updateinfo = get_kb_item("Host/RedHat/yum-updateinfo");
if (!empty_or_null(yum_updateinfo)) 
{
  rhsa = "RHSA-2004:463";
  yum_report = redhat_generate_yum_updateinfo_report(rhsa:rhsa);
  if (!empty_or_null(yum_report))
  {
    security_report_v4(
      port       : 0,
      severity   : SECURITY_WARNING,
      extra      : yum_report 
    );
    exit(0);
  }
  else
  {
    audit_message = "affected by Red Hat security advisory " + rhsa;
    audit(AUDIT_OS_NOT, audit_message);
  }
}
else
{
  flag = 0;
  if (rpm_check(release:"RHEL3", reference:"httpd-2.0.46-40.ent")) flag++;
  if (rpm_check(release:"RHEL3", reference:"httpd-devel-2.0.46-40.ent")) flag++;
  if (rpm_check(release:"RHEL3", reference:"mod_ssl-2.0.46-40.ent")) flag++;

  if (flag)
  {
    security_report_v4(
      port       : 0,
      severity   : SECURITY_WARNING,
      extra      : rpm_report_get() + redhat_report_package_caveat()
    );
    exit(0);
  }
  else
  {
    tested = pkg_tests_get();
    if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
    else audit(AUDIT_PACKAGE_NOT_INSTALLED, "httpd / httpd-devel / mod_ssl");
  }
}