Vulnerabilities > CVE-2014-3361 - Improper Restriction of Operations Within the Bounds of A Memory Buffer vulnerability in Cisco IOS

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-119
nessus
NVD
Published: 2014-09-25
Updated: 2017-08-29

Summary

The ALG module in Cisco IOS 15.0 through 15.4 does not properly implement SIP over NAT, which allows remote attackers to cause a denial of service (device reload) via multipart SDP IPv4 traffic, aka Bug ID CSCun54071.

Vulnerable Configurations

Part Description Count
OS
Cisco
5

Common Weakness Enumeration (CWE)

Common Attack Pattern Enumeration and Classification (CAPEC)

  • Buffer Overflow via Environment Variables
    This attack pattern involves causing a buffer overflow through manipulation of environment variables. Once the attacker finds that they can modify an environment variable, they may try to overflow associated buffers. This attack leverages implicit trust often placed in environment variables.
  • Overflow Buffers
    Buffer Overflow attacks target improper or missing bounds checking on buffer operations, typically triggered by input injected by an attacker. As a consequence, an attacker is able to write past the boundaries of allocated buffer regions in memory, causing a program crash or potentially redirection of execution as per the attackers' choice.
  • Client-side Injection-induced Buffer Overflow
    This type of attack exploits a buffer overflow vulnerability in targeted client software through injection of malicious content from a custom-built hostile service.
  • Filter Failure through Buffer Overflow
    In this attack, the idea is to cause an active filter to fail by causing an oversized transaction. An attacker may try to feed overly long input strings to the program in an attempt to overwhelm the filter (by causing a buffer overflow) and hoping that the filter does not fail securely (i.e. the user input is let into the system unfiltered).
  • MIME Conversion
    An attacker exploits a weakness in the MIME conversion routine to cause a buffer overflow and gain control over the mail server machine. The MIME system is designed to allow various different information formats to be interpreted and sent via e-mail. Attack points exist when data are converted to MIME compatible format and back.

Nessus

NASL familyCISCO
NASL idCISCO-SA-20140924-NAT.NASL
descriptionAccording to its self-reported version, the version of Cisco IOS running on the remote host is affected by a denial of service vulnerability in the Network Address Translation (NAT) application-layer gateway (ALG) module. This issue exists due to improper handling of multipart Session Description Protocol (SDP) in Session Initiation Protocol (SIP) messages. A remote attacker can exploit this issue by sending specially crafted SIP messages. Note that the affected configuration is not enabled by default.
last seen2019-10-28
modified2014-09-30
plugin id77984
published2014-09-30
reporterThis script is Copyright (C) 2014-2018 Tenable Network Security, Inc.
sourcehttps://www.tenable.com/plugins/nessus/77984
titleCisco IOS Software Network Address Translation (NAT) ALG Module DoS (cisco-sa-20140924-nat)
code
#TRUSTED 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
#
# (C) Tenable Network Security, Inc.
#

include("compat.inc");

if (description)
{
  script_id(77984);
  script_version("1.12");
  script_set_attribute(attribute:"plugin_modification_date", value:"2018/11/15");

  script_cve_id("CVE-2014-3361");
  script_bugtraq_id(70129);
  script_xref(name:"CISCO-BUG-ID", value:"CSCun54071");
  script_xref(name:"CISCO-SA", value:"cisco-sa-20140924-nat");

  script_name(english:"Cisco IOS Software Network Address Translation (NAT) ALG Module DoS (cisco-sa-20140924-nat)");
  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:
"According to its self-reported version, the version of Cisco IOS
running on the remote host is affected by a denial of service
vulnerability in the Network Address Translation (NAT)
application-layer gateway (ALG) module. This issue exists due to
improper handling of multipart Session Description Protocol (SDP) in
Session Initiation Protocol (SIP) messages. A remote attacker can
exploit this issue by sending specially crafted SIP messages.

Note that the affected configuration is not enabled by default.");
  # https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20140924-nat
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?b458c658");
  script_set_attribute(attribute:"see_also", value:"https://tools.cisco.com/security/center/viewAlert.x?alertId=35610");
  script_set_attribute(attribute:"see_also", value:"https://tools.cisco.com/bugsearch/bug/CSCun54071");
  script_set_attribute(attribute:"solution", value:
"Apply the relevant patch referenced in Cisco Security Advisory
cisco-sa-20140924-nat.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/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:"combined");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:ios");

  script_set_attribute(attribute:"vuln_publication_date", value:"2014/09/24");
  script_set_attribute(attribute:"patch_publication_date", value:"2014/09/24");
  script_set_attribute(attribute:"plugin_publication_date", value:"2014/09/30");

  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2014-2018 Tenable Network Security, Inc.");
  script_family(english:"CISCO");

  script_dependencies("cisco_ios_version.nasl");
  script_require_keys("Host/Cisco/IOS/Version");

  exit(0);
}

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

app = "Cisco IOS";
cbi = "CSCun54071";
fixed_ver = NULL;

ver = get_kb_item_or_exit("Host/Cisco/IOS/Version");

#15.0M
if (ver == "15.0(1)M" || ver == "15.0(1)M1" || ver == "15.0(1)M10" || ver == "15.0(1)M2" || ver == "15.0(1)M3" || ver == "15.0(1)M4" || ver == "15.0(1)M5" || ver == "15.0(1)M6" || ver == "15.0(1)M6a" || ver == "15.0(1)M7" || ver == "15.0(1)M8" || ver == "15.0(1)M9")
  fixed_ver = "15.1(4)M9";
#15.0XA
else if (ver == "15.0(1)XA" || ver == "15.0(1)XA1" || ver == "15.0(1)XA2" || ver == "15.0(1)XA3" || ver == "15.0(1)XA4" || ver == "15.0(1)XA5")
  fixed_ver = "15.1(4)M9";
#15.1GC
else if (ver == "15.1(2)GC" || ver == "15.1(2)GC1" || ver == "15.1(2)GC2" || ver == "15.1(4)GC" || ver == "15.1(4)GC1")
  fixed_ver = "15.1(4)GC2";
#15.1M
else if (ver == "15.1(4)M" || ver == "15.1(4)M0a" || ver == "15.1(4)M0b" || ver == "15.1(4)M1" || ver == "15.1(4)M2" || ver == "15.1(4)M3" || ver == "15.1(4)M3a" || ver == "15.1(4)M4" || ver == "15.1(4)M5" || ver == "15.1(4)M6" || ver == "15.1(4)M7" || ver == "15.1(4)M8")
  fixed_ver = "15.1(4)M9";
#15.1T
else if (ver == "15.1(1)T" || ver == "15.1(1)T1" || ver == "15.1(1)T2" || ver == "15.1(1)T3" || ver == "15.1(1)T4" || ver == "15.1(1)T5" || ver == "15.1(2)T" || ver == "15.1(2)T0a" || ver == "15.1(2)T1" || ver == "15.1(2)T2" || ver == "15.1(2)T2a" || ver == "15.1(2)T3" || ver == "15.1(2)T4" || ver == "15.1(2)T5" || ver == "15.1(3)T" || ver == "15.1(3)T1" || ver == "15.1(3)T2" || ver == "15.1(3)T3" || ver == "15.1(3)T4")
  fixed_ver = "15.1(4)M9";
#15.1XB
else if (ver == "15.1(1)XB" || ver == "15.1(1)XB1" || ver == "15.1(1)XB2" || ver == "15.1(1)XB3" || ver == "15.1(4)XB4" || ver == "15.1(4)XB5" || ver == "15.1(4)XB5a" || ver == "15.1(4)XB6" || ver == "15.1(4)XB7" || ver == "15.1(4)XB8" || ver == "15.1(4)XB8a")
  fixed_ver = "15.1(4)M9";
#15.2GC
else if (ver == "15.2(1)GC" || ver == "15.2(1)GC1" || ver == "15.2(1)GC2" || ver == "15.2(2)GC" || ver == "15.2(3)GC" || ver == "15.2(3)GC1" || ver == "15.2(4)GC" || ver == "15.2(4)GC1" || ver == "15.2(4)GC2")
  fixed_ver = "15.2(4)M7";
#15.2GCA
else if (ver == "15.2(3)GCA" || ver == "15.2(3)GCA1")
  fixed_ver = "15.4(1)T2 or 15.4(2)T1";
#15.2JA
else if (ver == "15.2(2)JA" || ver == "15.2(2)JA1" || ver == "15.2(4)JA" || ver == "15.2(4)JA1")
  fixed_ver = "15.2(2)JA2 or 15.2(4)JA2";
#15.2JAX
else if (ver == "15.2(2)JAX" || ver == "15.2(2)JAX1")
  fixed_ver = "Refer to the vendor for a fix.";
#15.2JAZ
else if (ver == "15.2(4)JAZ")
  fixed_ver = "Refer to the vendor for a fix.";
#15.2JB
else if (ver == "15.2(2)JB" || ver == "15.2(2)JB1" || ver == "15.2(2)JB2" || ver == "15.2(2)JB3" || ver == "15.2(4)JB" || ver == "15.2(4)JB1" || ver == "15.2(4)JB2" || ver == "15.2(4)JB3" || ver == "15.2(4)JB3a" || ver == "15.2(4)JB3b" || ver == "15.2(4)JB3h" || ver == "15.2(4)JB3s" || ver == "15.2(4)JB4" || ver == "15.2(4)JB5" || ver == "15.2(4)JB5h" || ver == "15.2(4)JB5m" || ver == "15.2(4)JB50")
  fixed_ver = "15.2(4)JB50a";
#15.2JN
else if (ver == "15.2(2)JN1" || ver == "15.2(2)JN2" || ver == "15.2(4)JN")
  fixed_ver = "Refer to the vendor for a fix.";
#15.2M
else if (ver == "15.2(4)M" || ver == "15.2(4)M1" || ver == "15.2(4)M2" || ver == "15.2(4)M3" || ver == "15.2(4)M4" || ver == "15.2(4)M5" || ver == "15.2(4)M6" || ver == "15.2(4)M6b")
  fixed_ver = "15.2(4)M7";
#15.2T
else if (ver == "15.2(1)T" || ver == "15.2(1)T1" || ver == "15.2(1)T2" || ver == "15.2(1)T3" || ver == "15.2(1)T3a" || ver == "15.2(1)T4" || ver == "15.2(2)T" || ver == "15.2(2)T1" || ver == "15.2(2)T2" || ver == "15.2(2)T3" || ver == "15.2(2)T4" || ver == "15.2(3)T" || ver == "15.2(3)T1" || ver == "15.2(3)T2" || ver == "15.2(3)T3" || ver == "15.2(3)T4")
  fixed_ver = "15.2(4)M7";
#15.2XA
else if (ver == "15.2(3)XA")
  fixed_ver = "15.2(4)M7";
#15.2XB
else if (ver == "15.2(4)XB10")
  fixed_ver = "15.2(4)XB11";
#15.3JA
else if (ver == "15.3(3)JA75")
  fixed_ver = "Refer to the vendor for a fix.";
#15.3M
else if (ver == "15.3(3)M" || ver == "15.3(3)M1" || ver == "15.3(3)M2")
  fixed_ver = "15.3(3)M3";
#15.3T
else if (ver == "15.3(1)T" || ver == "15.3(1)T1" || ver == "15.3(1)T2" || ver == "15.3(1)T3" || ver == "15.3(1)T4" || ver == "15.3(2)T" || ver == "15.3(2)T1" || ver == "15.3(2)T2" || ver == "15.3(2)T3")
  fixed_ver = "15.3(2)T4";
#15.4CG
else if (ver == "15.4(1)CG" || ver == "15.4(1)CG1" || ver == "15.4(2)CG")
  fixed_ver = "Refer to the vendor for a fix.";
#15.4T
else if (ver == "15.4(1)T" || ver == "15.4(1)T1" || ver == "15.4(2)T")
  fixed_ver = "15.4(1)T2 or 15.4(2)T1";

if (isnull(fixed_ver))
  audit(AUDIT_INST_VER_NOT_VULN, app, ver);

# NAT check
override = FALSE;

if (get_kb_item("Host/local_checks_enabled"))
{
  flag = FALSE;

  buf = cisco_command_kb_item("Host/Cisco/Config/show_ip_nat_statistics", "show ip nat statistics");
  if (check_cisco_result(buf))
  {
    if (
      preg(multiline:TRUE, pattern:"^Outside interfaces:\s+.*\s+Inside interfaces:", string:buf) ||
      preg(multiline:TRUE, pattern:"^Inside interfaces:\s+.*\s+Hits:", string:buf)
    ) flag = TRUE;
  }
  else if (cisco_needs_enable(buf)) override = TRUE;

  if (!flag && !override)
  {
    # NAT may still be active on the device through the NAT Virtual Interface feature
    buf = cisco_command_kb_item("Host/Cisco/Config/show_ip_nat_nvi_statistics", "show ip nat nvi statistics");
    if (check_cisco_result(buf))
    {
      if (preg(multiline:TRUE, pattern:"^NAT Enabled interfaces:\s+.*\s+Hits:", string:buf)) flag = TRUE;
    }
    else if (cisco_needs_enable(buf)) override = TRUE;
  }

  if (!flag && !override) audit(AUDIT_HOST_NOT, "affected because NAT is not active.");
}


if (report_verbosity > 0)
{
  report +=
    '\n  Cisco bug ID      : ' + cbi +
    '\n  Installed release : ' + ver +
    '\n  Fixed release     : ' + fixed_ver +
    '\n';
  security_hole(port:0, extra:report+cisco_caveat(override));
}
else security_hole(port:0, extra:cisco_caveat(override));

References