Vulnerabilities > CVE-2013-1167 - Path Traversal vulnerability in Cisco products

047910
CVSS 7.1 - HIGH
Attack vector
NETWORK
Attack complexity
MEDIUM
Privileges required
NONE
Confidentiality impact
NONE
Integrity impact
NONE
Availability impact
COMPLETE
network
cisco
CWE-22
nessus

Summary

Cisco IOS XE 3.2 through 3.4 before 3.4.2S, and 3.5, on 1000 series Aggregation Services Routers (ASR), when bridge domain interface (BDI) is enabled, allows remote attackers to cause a denial of service (card reload) via packets that are not properly handled during the processing of encapsulation, aka Bug ID CSCtt11558.

Common Attack Pattern Enumeration and Classification (CAPEC)

  • Relative Path Traversal
    An attacker exploits a weakness in input validation on the target by supplying a specially constructed path utilizing dot and slash characters for the purpose of obtaining access to arbitrary files or resources. An attacker modifies a known path on the target in order to reach material that is not available through intended channels. These attacks normally involve adding additional path separators (/ or \) and/or dots (.), or encodings thereof, in various combinations in order to reach parent directories or entirely separate trees of the target's directory structure.
  • Directory Traversal
    An attacker with access to file system resources, either directly or via application logic, will use various file path specification or navigation mechanisms such as ".." in path strings and absolute paths to extend their range of access to inappropriate areas of the file system. The attacker attempts to either explore the file system for recon purposes or access directories and files that are intended to be restricted from their access. Exploring the file system can be achieved through constructing paths presented to directory listing programs, such as "ls" and 'dir', or through specially crafted programs that attempt to explore the file system. The attacker engaging in this type of activity is searching for information that can be used later in a more exploitive attack. Access to restricted directories or files can be achieved through modification of path references utilized by system applications.
  • File System Function Injection, Content Based
    An attack of this type exploits the host's trust in executing remote content including binary files. The files are poisoned with a malicious payload (targeting the file systems accessible by the target software) by the attacker and may be passed through standard channels such as via email, and standard web content like PDF and multimedia files. The attacker exploits known vulnerabilities or handling routines in the target processes. Vulnerabilities of this type have been found in a wide variety of commercial applications from Microsoft Office to Adobe Acrobat and Apple Safari web browser. When the attacker knows the standard handling routines and can identify vulnerabilities and entry points they can be exploited by otherwise seemingly normal content. Once the attack is executed, the attackers' program can access relative directories such as C:\Program Files or other standard system directories to launch further attacks. In a worst case scenario, these programs are combined with other propagation logic and work as a virus.
  • Using Slashes and URL Encoding Combined to Bypass Validation Logic
    This attack targets the encoding of the URL combined with the encoding of the slash characters. An attacker can take advantage of the multiple way of encoding an URL and abuse the interpretation of the URL. An URL may contain special character that need special syntax handling in order to be interpreted. Special characters are represented using a percentage character followed by two digits representing the octet code of the original character (%HEX-CODE). For instance US-ASCII space character would be represented with %20. This is often referred as escaped ending or percent-encoding. Since the server decodes the URL from the requests, it may restrict the access to some URL paths by validating and filtering out the URL requests it received. An attacker will try to craft an URL with a sequence of special characters which once interpreted by the server will be equivalent to a forbidden URL. It can be difficult to protect against this attack since the URL can contain other format of encoding such as UTF-8 encoding, Unicode-encoding, etc.
  • Manipulating Input to File System Calls
    An attacker manipulates inputs to the target software which the target software passes to file system calls in the OS. The goal is to gain access to, and perhaps modify, areas of the file system that the target software did not intend to be accessible.

Nessus

NASL familyCISCO
NASL idCISCO-SA-20130410-ASR1000-IOSXE.NASL
descriptionCisco IOS XE Software for 1000 Series Aggregation Services Routers (ASR) contains the following denial of service (DoS) vulnerabilities : - Cisco IOS XE Software IPv6 Multicast Traffic Denial of Service Vulnerability (CVE-2013-1164) - Cisco IOS XE Software L2TP Traffic Denial of Service Vulnerability (CVE-2013-1165) - Cisco IOS XE Software SIP Traffic Denial of Service Vulnerability (CVE-2013-1166) - Cisco IOS XE Software Bridge Domain Interface Denial of Service Vulnerability (CVE-2013-1167) - Cisco IOS XE Software MVPNv6 Traffic Denial of Service Vulnerability (CVE-2013-2779) These vulnerabilities are independent of each other, meaning that a release that is affected by one of the vulnerabilities may not be affected by the others. Successful exploitation of any of these vulnerabilities allows an unauthenticated, remote attacker to trigger a reload of the Embedded Services Processors (ESP) card or the Route Processor (RP) card, causing an interruption of services. Repeated exploitation could result in a sustained DoS condition.
last seen2019-10-28
modified2013-07-10
plugin id67218
published2013-07-10
reporterThis script is Copyright (C) 2013-2018 Tenable Network Security, Inc.
sourcehttps://www.tenable.com/plugins/nessus/67218
titleMultiple Vulnerabilities in Cisco IOS XE Software for 1000 Series Aggregation Services Routers (cisco-sa-20130410-asr1000)
code
#TRUSTED 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
#
# (C) Tenable Network Security, Inc.
#

include("compat.inc");

if (description)
{
  script_id(67218);
  script_version("1.8");
  script_set_attribute(attribute:"plugin_modification_date", value:"2018/11/15");

  script_cve_id(
    "CVE-2013-1164",
    "CVE-2013-1165",
    "CVE-2013-1166",
    "CVE-2013-1167",
    "CVE-2013-2779"
  );
  script_bugtraq_id(59003, 59007, 59008, 59009, 59040);
  script_xref(name:"CISCO-BUG-ID", value:"CSCtz97563");
  script_xref(name:"CISCO-BUG-ID", value:"CSCub34945");
  script_xref(name:"CISCO-BUG-ID", value:"CSCtz23293");
  script_xref(name:"CISCO-BUG-ID", value:"CSCuc65609");
  script_xref(name:"CISCO-BUG-ID", value:"CSCtt11558");
  script_xref(name:"CISCO-SA", value:"cisco-sa-20130410-asr1000");

  script_name(english:"Multiple Vulnerabilities in Cisco IOS XE Software for 1000 Series Aggregation Services Routers (cisco-sa-20130410-asr1000)");
  script_summary(english:"Checks the IOS version.");

  script_set_attribute(attribute:"synopsis", value:
"The remote device is missing a vendor-supplied security patch.");
  script_set_attribute(attribute:"description", value:
"Cisco IOS XE Software for 1000 Series Aggregation Services Routers
(ASR) contains the following denial of service (DoS) vulnerabilities :

  - Cisco IOS XE Software IPv6 Multicast Traffic Denial of
    Service Vulnerability (CVE-2013-1164)

  - Cisco IOS XE Software L2TP Traffic Denial of Service
    Vulnerability (CVE-2013-1165)

  - Cisco IOS XE Software SIP Traffic Denial of Service
    Vulnerability (CVE-2013-1166)

  - Cisco IOS XE Software Bridge Domain Interface Denial of
    Service Vulnerability (CVE-2013-1167)

  - Cisco IOS XE Software MVPNv6 Traffic Denial of Service
    Vulnerability (CVE-2013-2779)

These vulnerabilities are independent of each other, meaning that a
release that is affected by one of the vulnerabilities may not be
affected by the others.

Successful exploitation of any of these vulnerabilities allows an
unauthenticated, remote attacker to trigger a reload of the Embedded
Services Processors (ESP) card or the Route Processor (RP) card,
causing an interruption of services.

Repeated exploitation could result in a sustained DoS condition.");
  # https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20130410-asr1000
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?8ee7b008");
  script_set_attribute(attribute:"solution", value:
"Apply the relevant patch referenced in Cisco Security Advisory
cisco-sa-20130410-asr1000.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C");
  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:"cpe:/o:cisco:ios_xe");

  script_set_attribute(attribute:"vuln_publication_date", value:"2013/04/10");
  script_set_attribute(attribute:"patch_publication_date", value:"2013/04/15");
  script_set_attribute(attribute:"plugin_publication_date", value:"2013/07/10");

  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2013-2018 Tenable Network Security, Inc.");
  script_family(english:"CISCO");

  script_dependencies("cisco_ios_xe_version.nasl");
  script_require_keys("Host/Cisco/IOS-XE/Version");

  exit(0);
}

include("audit.inc");
include("cisco_func.inc");
include("cisco_kb_cmd_func.inc");

flag = 0;
report_extras = "";
override = 0;
model = "";

# check hardware
if (get_kb_item("Host/local_checks_enabled"))
{
  # this advisory only addresses CISCO ASR 1000 series
  buf = cisco_command_kb_item("Host/Cisco/Config/show_platform", "show platform");
  if (buf)
  {
    match = eregmatch(pattern:"Chassis type:\s+ASR([^ ]+)", string:buf);
    if (!isnull(match)) model = match[1];
  }
}
if (model !~ '^10[0-9][0-9]')
  audit(AUDIT_HOST_NOT, 'ASR 1000 Series');

version = get_kb_item_or_exit("Host/Cisco/IOS-XE/Version");

# for each cisco bug id, check version and then individual additional checks
# --------------------------------------------
# Cisco IOS XE Software IPv6 Multicast Traffic Denial of Service Vulnerability
# Cisco IOS XE Software MVPNv6 Traffic Denial of Service Vulnerability

cbi = "CSCtz97563 and CSCub34945";
fixed_ver = "";
temp_flag = 0;
if ((version =~ '^3\\.4[^0-9]') && (cisco_gen_ver_compare(a:version,b:'3.4.5S') == -1)) { fixed_ver = "3.4.5S"; temp_flag++; }
if (version =~ '^3\\.5[^0-9]') { fixed_ver = "migrate to an appropriate extended release"; temp_flag++; }
if (version =~ '^3\\.6[^0-9]') { fixed_ver = "migrate to an appropriate extended release"; temp_flag++; }

if (get_kb_item("Host/local_checks_enabled"))
{
  if (temp_flag)
  {
    temp_flag = 0;
    buf = cisco_command_kb_item("Host/Cisco/Config/show_running_include_ipv6", "show running | include ipv6.(enable|address)");
    if (check_cisco_result(buf))
    {
      if ( (preg(multiline:TRUE, pattern:"ipv6 enable", string:buf)) && (preg(multiline:TRUE, pattern:"ipv6 address", string:buf)) ) { temp_flag = 1; }
	  if (temp_flag)
      {
	    temp_flag = 0;
        buf = cisco_command_kb_item("Host/Cisco/Config/show_inventory", "show inventory");
        if (check_cisco_result(buf))
        {
          if (preg(multiline:TRUE, pattern:"ASR1000-ESP40", string:buf)) { temp_flag = 1; }
          if (preg(multiline:TRUE, pattern:"ASR1000-ESP100", string:buf)) { temp_flag = 1; }
        } else if (cisco_needs_enable(buf)) { temp_flag = 1; override = 1; }
      }
    } else if (cisco_needs_enable(buf)) { temp_flag = 1; override = 1; }
  }
}

if (temp_flag)
{
  report +=
    '\n  Cisco bug ID      : ' + cbi +
    '\n  Installed release : ' + ver +
    '\n  Fixed release     : ' + fixed_ver + '\n';
  flag++;
}

# --------------------------------------------
# Cisco IOS XE Software L2TP Traffic Denial of Service Vulnerability

cbi = "CSCtz23293";
fixed_ver = "";
temp_flag = 0;
if (version =~ '^2[^0-9]') { fixed_ver = "migrate to an appropriate extended release"; temp_flag++; }
if (version =~ '^3\\.1[^0-9]') { fixed_ver = "migrate to an appropriate extended release"; temp_flag++; }
if (version =~ '^3\\.2[^0-9]') { fixed_ver = "migrate to an appropriate extended release"; temp_flag++; }
if (version =~ '^3\\.3[^0-9]') { fixed_ver = "migrate to an appropriate extended release"; temp_flag++; }
if ((version =~ '^3\\.4[^0-9]') && (cisco_gen_ver_compare(a:version,b:'3.4.5S') == -1)) { fixed_ver = "3.4.5S"; temp_flag++; }
if (version =~ '^3\\.5[^0-9]') { fixed_ver = "migrate to an appropriate extended release"; temp_flag++; }
if (version =~ '^3\\.6[^0-9]') { fixed_ver = "migrate to an appropriate extended release"; temp_flag++; }
if ((version =~ '^3\\.7[^0-9]') && (cisco_gen_ver_compare(a:version,b:'3.7.1S') == -1)) { fixed_ver = "3.7.1S"; temp_flag++; }

if (get_kb_item("Host/local_checks_enabled"))
{
  if (temp_flag)
  {
    temp_flag = 0;
    buf = cisco_command_kb_item("Host/Cisco/Config/show_running_include_accept-dialin", "show running | include accept-dialin");
    if (check_cisco_result(buf))
    {
      if (preg(multiline:TRUE, pattern:"accept-dialin", string:buf)) { temp_flag = 1; }
      if (temp_flag)
      {
	  	temp_flag = 0;
        buf = cisco_command_kb_item("Host/Cisco/Config/show_running_include_xconnect_l2tpv3", "show running | include xconnect|l2tpv3");
        if (check_cisco_result(buf))
        {
          if ( (preg(multiline:TRUE, pattern:"encapsulation l2tpv3", string:buf)) && (preg(multiline:TRUE, pattern:"xconnect", string:buf)) ) { temp_flag = 1; }
        } else if (cisco_needs_enable(buf)) { temp_flag = 1; override = 1; }
      }
    } else if (cisco_needs_enable(buf)) { temp_flag = 1; override = 1; }
  }
}

if (temp_flag)
{
  report +=
    '\n  Cisco bug ID      : ' + cbi +
    '\n  Installed release : ' + ver +
    '\n  Fixed release     : ' + fixed_ver + '\n';
  flag++;
}

# --------------------------------------------
# Cisco IOS XE Software Bridge Domain Interface Denial of Service Vulnerability

cbi = "CSCtt11558";
fixed_ver = "";
temp_flag = 0;
if (version =~ '^3\\.2[^0-9]') { fixed_ver = "migrate to an appropriate extended release"; temp_flag++; }
if (version =~ '^3\\.3[^0-9]') { fixed_ver = "migrate to an appropriate extended release"; temp_flag++; }
if ((version =~ '^3\\.4[^0-9]') && (cisco_gen_ver_compare(a:version,b:'3.4.2S') == -1)) { fixed_ver = "3.4.2S"; temp_flag++; }
if (version =~ '^3\\.5[^0-9]') { fixed_ver = "migrate to an appropriate extended release"; temp_flag++; }

# this check may result in a False Positive condition
# as it would be impossible to create a check that handles
# 100% of configurations, this is a best effort approach
if (get_kb_item("Host/local_checks_enabled"))
{
  if (temp_flag)
  {
    temp_flag = 0;
    buf = cisco_command_kb_item("Host/Cisco/Config/show_running_include_interface", "show running | section interface");
    if (check_cisco_result(buf))
    {
        if (
             (preg(multiline:TRUE, pattern:"interface[^!]*encapsulation untagged", string:buf)) &&
             (preg(multiline:TRUE, pattern:"interface BDI", string:buf)) &&
             (preg(multiline:TRUE, pattern:"rewrite egress", string:buf)) ) { flag = 1; }
        { temp_flag = 1; }
    } else if (cisco_needs_enable(buf)) { temp_flag = 1; override = 1; }
  }
}

if (temp_flag)
{
  report +=
    '\n  Cisco bug ID      : ' + cbi +
    '\n  Installed release : ' + ver +
    '\n  Fixed release     : ' + fixed_ver + '\n';
  flag++;
}

# --------------------------------------------
# Cisco IOS XE Software SIP Traffic Denial of Service Vulnerability

cbi = "CSCuc65609";
fixed_ver = "";
temp_flag = 0;
if ((version =~ '^3\\.4[^0-9]') && (cisco_gen_ver_compare(a:version,b:'3.4.2S') == -1)) { fixed_ver = "3.4.5S"; temp_flag++; }

if (get_kb_item("Host/local_checks_enabled"))
{
  if (temp_flag)
  {
    temp_flag = 0;
    buf = cisco_command_kb_item("Host/Cisco/Config/show_running-config_include_ipnatvrf", "show running-config  | include ip (nat | .* vrf .*)");
    if (check_cisco_result(buf))
    {
      if (preg(multiline:TRUE, pattern:"\s+ip\s+nat\s+inside", string:buf)) { temp_flag = 1; }
      if (preg(multiline:TRUE, pattern:"\s+ip\s+nat\s+outside", string:buf)) { temp_flag = 1; }
      if (temp_flag)
      {
	    temp_flag = 0;
        buf = cisco_command_kb_item("Host/Cisco/Config/show_running_include_ipnat", "show running | include ip nat");
        if (check_cisco_result(buf))
        {
          if (!preg(multiline:TRUE, pattern:"no ip nat service sip", string:buf)) { temp_flag = 1; }
        } else if (cisco_needs_enable(buf)) { temp_flag = 1; override = 1; }
      }
    } else if (cisco_needs_enable(buf)) { temp_flag = 1; override = 1; }
  }
}

if (temp_flag)
{
  report +=
    '\n  Cisco bug ID      : ' + cbi +
    '\n  Installed release : ' + ver +
    '\n  Fixed release     : ' + fixed_ver + '\n';
  flag++;
}

# --------------------------------------------

if (flag)
{
  security_hole(port:0, extra:report + cisco_caveat());
  exit(0);
}
else audit(AUDIT_HOST_NOT, "affected");