Vulnerabilities > CVE-2011-0495 - Improper Restriction of Operations Within the Bounds of A Memory Buffer vulnerability in Digium Asterisk

#%NASL_MIN_LEVEL 80502
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Fedora Security Advisory 2011-0794.
#

include("compat.inc");

if (description)
{
  script_id(51864);
  script_version("1.12");
  script_cvs_date("Date: 2019/08/02 13:32:33");

  script_cve_id("CVE-2011-0495");
  script_xref(name:"FEDORA", value:"2011-0794");

  script_name(english:"Fedora 13 : asterisk-1.6.2.16.1-1.fc13 (2011-0794)");
  script_summary(english:"Checks rpm output for the updated package.");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote Fedora host is missing a security update."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"Update to 1.6.2.16.1 to fix CVE-2011-0495.

Note that Tenable Network Security has extracted the preceding
description block directly from the Fedora security advisory. Tenable
has attempted to automatically clean and format it as much as possible
without introducing additional issues."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.redhat.com/show_bug.cgi?id=670777"
  );
  # https://lists.fedoraproject.org/pipermail/package-announce/2011-February/053713.html
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?3527088b"
  );
  script_set_attribute(
    attribute:"solution", 
    value:"Update the affected asterisk package."
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:S/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fedoraproject:fedora:asterisk");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:fedoraproject:fedora:13");

  script_set_attribute(attribute:"patch_publication_date", value:"2011/01/26");
  script_set_attribute(attribute:"plugin_publication_date", value:"2011/02/04");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2011-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"Fedora Local Security Checks");

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

  exit(0);
}


include("audit.inc");
include("global_settings.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) || "Fedora" >!< release) audit(AUDIT_OS_NOT, "Fedora");
os_ver = eregmatch(pattern: "Fedora.*release ([0-9]+)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Fedora");
os_ver = os_ver[1];
if (! ereg(pattern:"^13([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "Fedora 13.x", "Fedora " + 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$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "Fedora", cpu);

flag = 0;
if (rpm_check(release:"FC13", reference:"asterisk-1.6.2.16.1-1.fc13")) flag++;


if (flag)
{
  if (report_verbosity > 0) security_warning(port:0, extra:rpm_report_get());
  else security_warning(0);
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "asterisk");
}

#%NASL_MIN_LEVEL 80502
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Fedora Security Advisory 2011-0774.
#

include("compat.inc");

if (description)
{
  script_id(51863);
  script_version("1.12");
  script_cvs_date("Date: 2019/08/02 13:32:33");

  script_cve_id("CVE-2011-0495");
  script_xref(name:"FEDORA", value:"2011-0774");

  script_name(english:"Fedora 14 : asterisk-1.6.2.16.1-1.fc14 (2011-0774)");
  script_summary(english:"Checks rpm output for the updated package.");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote Fedora host is missing a security update."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"Update to 1.6.2.16.1 to fix CVE-2011-0495

Note that Tenable Network Security has extracted the preceding
description block directly from the Fedora security advisory. Tenable
has attempted to automatically clean and format it as much as possible
without introducing additional issues."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.redhat.com/show_bug.cgi?id=670777"
  );
  # https://lists.fedoraproject.org/pipermail/package-announce/2011-February/053689.html
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?6358f93f"
  );
  script_set_attribute(
    attribute:"solution", 
    value:"Update the affected asterisk package."
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:S/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fedoraproject:fedora:asterisk");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:fedoraproject:fedora:14");

  script_set_attribute(attribute:"patch_publication_date", value:"2011/01/26");
  script_set_attribute(attribute:"plugin_publication_date", value:"2011/02/04");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2011-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"Fedora Local Security Checks");

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

  exit(0);
}


include("audit.inc");
include("global_settings.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) || "Fedora" >!< release) audit(AUDIT_OS_NOT, "Fedora");
os_ver = eregmatch(pattern: "Fedora.*release ([0-9]+)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Fedora");
os_ver = os_ver[1];
if (! ereg(pattern:"^14([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "Fedora 14.x", "Fedora " + 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$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "Fedora", cpu);

flag = 0;
if (rpm_check(release:"FC14", reference:"asterisk-1.6.2.16.1-1.fc14")) flag++;


if (flag)
{
  if (report_verbosity > 0) security_warning(port:0, extra:rpm_report_get());
  else security_warning(0);
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "asterisk");
}

#%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-2171. The text 
# itself is copyright (C) Software in the Public Interest, Inc.
#

include("compat.inc");

if (description)
{
  script_id(52055);
  script_version("1.16");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/03/12");

  script_cve_id("CVE-2011-0495");
  script_bugtraq_id(45839);
  script_xref(name:"DSA", value:"2171");

  script_name(english:"Debian DSA-2171-1 : asterisk - buffer overflow");
  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:
"Matthew Nicholson discovered a buffer overflow in the SIP channel
driver of Asterisk, an open source PBX and telephony toolkit, which
could lead to the execution of arbitrary code."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=610487"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://packages.debian.org/source/squeeze/asterisk"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.debian.org/security/2011/dsa-2171"
  );
  script_set_attribute(
    attribute:"solution", 
    value:
"Upgrade the asterisk packages.

For the oldstable distribution (lenny), this problem has been fixed in
version 1.4.21.2~dfsg-3+lenny2.

For the stable distribution (squeeze), this problem has been fixed in
version 1.6.2.9-2+squeeze1."
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:S/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:ND/RL:OF/RC:C");
  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:asterisk");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:5.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:6.0");

  script_set_attribute(attribute:"patch_publication_date", value:"2011/02/21");
  script_set_attribute(attribute:"plugin_publication_date", value:"2011/02/22");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2011-2020 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:"5.0", prefix:"asterisk", reference:"1.4.21.2~dfsg-3+lenny2")) flag++;
if (deb_check(release:"6.0", prefix:"asterisk", reference:"1.6.2.9-2+squeeze1")) flag++;
if (deb_check(release:"6.0", prefix:"asterisk-config", reference:"1.6.2.9-2+squeeze1")) flag++;
if (deb_check(release:"6.0", prefix:"asterisk-dbg", reference:"1.6.2.9-2+squeeze1")) flag++;
if (deb_check(release:"6.0", prefix:"asterisk-dev", reference:"1.6.2.9-2+squeeze1")) flag++;
if (deb_check(release:"6.0", prefix:"asterisk-doc", reference:"1.6.2.9-2+squeeze1")) flag++;
if (deb_check(release:"6.0", prefix:"asterisk-h323", reference:"1.6.2.9-2+squeeze1")) flag++;
if (deb_check(release:"6.0", prefix:"asterisk-sounds-main", reference:"1.6.2.9-2+squeeze1")) 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(51644);
  script_version("1.17");
  script_cvs_date("Date: 2018/06/27 18:42:25");

  script_cve_id("CVE-2011-0495");
  script_bugtraq_id(45839);
  script_xref(name:"Secunia", value:"42935");

  script_name(english:"Asterisk main/utils.c ast_uri_encode() CallerID Information Overflow (AST-2011-001)");
  script_summary(english:"Checks version in SIP banner");

  script_set_attribute(attribute:"synopsis", value:
"A telephony application running on the remote host is affected by a
buffer overflow vulnerability.");
  script_set_attribute(attribute:"description", value:
"Using a specially crafted caller ID string, an authenticated user
placing an outgoing call through the remote Asterisk server can cause
a buffer overflow leading to an application crash or execution of
arbitrary code.

Successful exploitation may require that the SIP channel driver is
configured with the 'pedantic' option enabled.");
  script_set_attribute(attribute:"see_also", value:"http://downloads.asterisk.org/pub/security/AST-2011-001.html");
  script_set_attribute(attribute:"solution", value:
"Upgrade to Asterisk 1.4.38.1 / 1.4.39.1 / 1.6.1.21 / 1.6.2.15.1 /
1.6.2.16.1 / 1.8.1.2 / 1.8.2.2, Asterisk Business Edition C.3.6.2 or
later.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"vuln_publication_date", value:"2011/01/11");
  script_set_attribute(attribute:"patch_publication_date", value:"2011/01/18");
  script_set_attribute(attribute:"plugin_publication_date", value:"2011/01/21");

  script_set_attribute(attribute:"potential_vulnerability", value:"true");
  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:digium:asterisk");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Gain a shell remotely");

  script_copyright(english:"This script is Copyright (C) 2011-2018 Tenable Network Security, Inc.");

  script_dependencies("asterisk_detection.nasl");
  script_require_keys("asterisk/sip_detected", "Settings/ParanoidReport");

  exit(0);
}

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

get_kb_item_or_exit("asterisk/sip_detected");

# see if we were able to get version info from the Asterisk SIP services
asterisk_kbs = get_kb_list("sip/asterisk/*/version");
if (isnull(asterisk_kbs)) exit(1, "Could not obtain any version information from the Asterisk SIP instance(s).");

# Prevent potential false positives.
if (report_paranoia < 2) audit(AUDIT_PARANOID);

is_vuln = FALSE;
not_vuln_installs = make_list();
errors = make_list();

foreach kb_name (keys(asterisk_kbs))
{
  vulnerable = 0;

  matches = eregmatch(pattern:"/(udp|tcp)/([0-9]+)/version", string:kb_name);
  if (isnull(matches))
  {
    errors = make_list(errors, "Unexpected error parsing port number from kb name: "+kb_name);
    continue;
  }

  proto = matches[1];
  port  = matches[2];
  version = asterisk_kbs[kb_name];

  if (version == 'unknown')
  {
    errors = make_list(errors, "Unable to obtain version of install on " + proto + "/" + port);
    continue;
  }

  banner = get_kb_item("sip/asterisk/" + proto + "/" + port + "/source");
  if (!banner)
  {
    # We have version but banner is missing; log error
    # and use in version-check though.
    errors = make_list(errors, "KB item 'sip/asterisk/" + proto + "/" + port + "/source' is missing");
    banner = 'unknown';
  }

  if (version =~ '^1\\.2([^0-9]|$)')
  {
    # No longer supported by vendor.
    fixed = "The 1.2 branch is no longer supported.";
    vulnerable = -1;
  }
  else if (version =~ '^1\\.4([^0-9]|$)')
  {
    if (version =~ '^1\\.4\\.38([^0-9]|$)')
    {
      fixed = "1.4.38.1";
      vulnerable = ver_compare(ver:version, fix:fixed, app:"asterisk");
    }
    else if (version =~ '^1\\.4\\.39([^0-9]|$)')
    {
      fixed = "1.4.39.1";
      vulnerable = ver_compare(ver:version, fix:fixed, app:"asterisk");
    }
    else
    {
      # Recommend lowest patched version in the 1.4 branch.
      fixed = "1.4.38.1";
      vulnerable = ver_compare(ver:version, fix:"1.4.40", app:"asterisk");
    }
  }
  else if (version =~ '^1\\.6([^0-9]|$)')
  {
    if (version =~ '^1\\.6\\.1([^0-9]|$)')
    {
      fixed = "1.6.1.21";
      vulnerable = ver_compare(ver:version, fix:fixed, app:"asterisk");
    }
    else if (version =~ '^1\\.6\\.2([^0-9]|$)')
    {
      if (version =~ '^1\\.6\\.2\\.15([^0-9]|$)')
      {
        fixed = "1.6.2.15.1";
        vulnerable = ver_compare(ver:version, fix:fixed, app:"asterisk");
      }
      else if (version =~ '^1\\.6\\.2\\.16([^0-9]|$)')
      {
        fixed = "1.6.2.16.1";
        vulnerable = ver_compare(ver:version, fix:fixed, app:"asterisk");
      }
      else
      {
        # Recommend lowest patched version in the 1.6.2 branch.
        fixed = "1.6.2.15.1";
        vulnerable = ver_compare(ver:version, fix:"1.6.2.17", app:"asterisk");
      }
    }
    else
    {
      # Recommend lowest patched version in the 1.6 branch.
      fixed = "1.6.1.21";
      vulnerable = ver_compare(ver:version, fix:"1.6.3", app:"asterisk");
    }
  }
  else if (version =~ '^1\\.8([^0-9]|$)')
  {
    if (version =~ '^1\\.8\\.1([^0-9]|$)')
    {
      fixed = "1.8.1.2";
      vulnerable = ver_compare(ver:version, fix:fixed, app:"asterisk");
    }
    else if (version =~ '^1\\.8\\.2([^0-9]|$)')
    {
      fixed = "1.8.2.2";
      vulnerable = ver_compare(ver:version, fix:fixed, app:"asterisk");
    }
    else
    {
      # Recommend lowest patched version in the 1.8 branch.
      fixed = "1.8.1.2";
      vulnerable = ver_compare(ver:version, fix:"1.8.3", app:"asterisk");
    }
  }
  else if (version =~ '^[A-Z]')
  {
    fixed = "C.3.6.2";

    if (version[0] <= "B")
    {
      vulnerable = -1;
    }
    else if (version[0] > "C")
    {
      vulnerable = 1;
    }
    else
    {
      tmp_fixed = substr(fixed, 2);
      tmp_version = substr(version, 2);
      vulnerable = ver_compare(ver:tmp_version, fix:tmp_fixed, app:"asterisk");
    }
  }

  if (vulnerable < 0)
  {
    is_vuln = TRUE;
    if (report_verbosity > 0)
    {
      report =
        '\n  Version source    : ' + banner +
        '\n  Installed version : ' + version +
        '\n  Fixed version     : ' + fixed + '\n';
      security_warning(port:port, proto:proto, extra:report);
    }
    else security_warning(port:port, proto:proto);
  }
  else not_vuln_installs = make_list(not_vuln_installs, version + " on port " + proto + "/" + port);
}

if (max_index(errors))
{
  if (max_index(errors) == 1) errmsg = errors[0];
  else errmsg = 'Errors were encountered verifying installs : \n  ' + join(errors, sep:'\n  ');

  exit(1, errmsg);
}
else
{
  installs = max_index(not_vuln_installs);
  if (installs == 0)
  {
    if (is_vuln)
      exit(0);
    else
      audit(AUDIT_NOT_INST, "Asterisk");
  }
  else if (installs == 1) audit(AUDIT_INST_VER_NOT_VULN, "Asterisk " + not_vuln_installs[0]);
  else exit(0, "The Asterisk installs (" + join(not_vuln_installs, sep:", ") + ") are not affected.");
}