Vulnerabilities > CVE-2014-2113 - Improper Input Validation vulnerability in Cisco IOS and IOS XE
Attack vector
NETWORK Attack complexity
LOW Privileges required
NONE Confidentiality impact
NONE Integrity impact
NONE Availability impact
COMPLETE Summary
Cisco IOS 15.1 through 15.3 and IOS XE 3.3 and 3.5 before 3.5.2E; 3.7 before 3.7.5S; and 3.8, 3.9, and 3.10 before 3.10.2S allow remote attackers to cause a denial of service (I/O memory consumption and device reload) via a malformed IPv6 packet, aka Bug ID CSCui59540.
Vulnerable Configurations
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.
- Server Side Include (SSI) Injection An attacker can use Server Side Include (SSI) Injection to send code to a web application that then gets executed by the web server. Doing so enables the attacker to achieve similar results to Cross Site Scripting, viz., arbitrary code execution and information disclosure, albeit on a more limited scale, since the SSI directives are nowhere near as powerful as a full-fledged scripting language. Nonetheless, the attacker can conveniently gain access to sensitive files, such as password files, and execute shell commands.
- Cross Zone Scripting An attacker is able to cause a victim to load content into their web-browser that bypasses security zone controls and gain access to increased privileges to execute scripting code or other web objects such as unsigned ActiveX controls or applets. This is a privilege elevation attack targeted at zone-based web-browser security. In a zone-based model, pages belong to one of a set of zones corresponding to the level of privilege assigned to that page. Pages in an untrusted zone would have a lesser level of access to the system and/or be restricted in the types of executable content it was allowed to invoke. In a cross-zone scripting attack, a page that should be assigned to a less privileged zone is granted the privileges of a more trusted zone. This can be accomplished by exploiting bugs in the browser, exploiting incorrect configuration in the zone controls, through a cross-site scripting attack that causes the attackers' content to be treated as coming from a more trusted page, or by leveraging some piece of system functionality that is accessible from both the trusted and less trusted zone. This attack differs from "Restful Privilege Escalation" in that the latter correlates to the inadequate securing of RESTful access methods (such as HTTP DELETE) on the server, while cross-zone scripting attacks the concept of security zones as implemented by a browser.
- Cross Site Scripting through Log Files An attacker may leverage a system weakness where logs are susceptible to log injection to insert scripts into the system's logs. If these logs are later viewed by an administrator through a thin administrative interface and the log data is not properly HTML encoded before being written to the page, the attackers' scripts stored in the log will be executed in the administrative interface with potentially serious consequences. This attack pattern is really a combination of two other attack patterns: log injection and stored cross site scripting.
- Command Line Execution through SQL Injection An attacker uses standard SQL injection methods to inject data into the command line for execution. This could be done directly through misuse of directives such as MSSQL_xp_cmdshell or indirectly through injection of data into the database that would be interpreted as shell commands. Sometime later, an unscrupulous backend application (or could be part of the functionality of the same application) fetches the injected data stored in the database and uses this data as command line arguments without performing proper validation. The malicious data escapes that data plane by spawning new commands to be executed on the host.
Nessus
NASL family CISCO NASL id CISCO-SA-20140326-IPV6-IOSXE.NASL description According to its self-reported version, the version of Cisco IOS XE running on the remote host is affected by a denial of service vulnerability in the IPv6 protocol stack. This issue exists due to improper handling of certain, unspecified types of IPv6 packets. An unauthenticated, remote attacker could potentially exploit this issue by sending a specially crafted IPv6 packet resulting in a denial of service. Note that this issue only affects hosts with IPv6 enabled. last seen 2019-10-28 modified 2014-04-04 plugin id 73343 published 2014-04-04 reporter This script is Copyright (C) 2014-2018 Tenable Network Security, Inc. source https://www.tenable.com/plugins/nessus/73343 title Cisco IOS XE Software IPv6 Denial of Service (cisco-sa-20140326-ipv6 code #TRUSTED 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 # # (C) Tenable Network Security, Inc. # include("compat.inc"); if (description) { script_id(73343); script_version("1.10"); script_set_attribute(attribute:"plugin_modification_date", value:"2018/11/15"); script_cve_id("CVE-2014-2113"); script_bugtraq_id(66467); script_xref(name:"CISCO-BUG-ID", value:"CSCui59540"); script_xref(name:"CISCO-SA", value:"cisco-sa-20140326-ipv6"); script_name(english:"Cisco IOS XE Software IPv6 Denial of Service (cisco-sa-20140326-ipv6"); script_summary(english:"Checks the IOS XE 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 XE running on the remote host is affected by a denial of service vulnerability in the IPv6 protocol stack. This issue exists due to improper handling of certain, unspecified types of IPv6 packets. An unauthenticated, remote attacker could potentially exploit this issue by sending a specially crafted IPv6 packet resulting in a denial of service. Note that this issue only affects hosts with IPv6 enabled."); # https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20140326-ipv6 script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?0ffd6d00"); script_set_attribute(attribute:"see_also", value:"https://tools.cisco.com/security/center/viewAlert.x?alertId=33351"); script_set_attribute(attribute:"solution", value: "Apply the relevant patch referenced in Cisco Security Advisory cisco-sa-20140326-ipv6."); 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:"2014/03/26"); script_set_attribute(attribute:"patch_publication_date", value:"2014/01/31"); script_set_attribute(attribute:"plugin_publication_date", value:"2014/04/04"); 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_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; override = 0; report = ""; fixed_ver = ""; cbi = "CSCui59540"; ver = get_kb_item_or_exit("Host/Cisco/IOS-XE/Version"); # 3.7xS if (ver == '3.7.0S' || ver == '3.7.1S' || ver == '3.7.2S' || ver == '3.7.3S' || ver == '3.7.4S') fixed_ver = '3.7.5S'; # 3.5xE else if (ver == '3.5.0E' || ver == '3.5.1E') fixed_ver = '3.5.2E'; # 3.3xXO else if (ver == '3.3.0XO)') fixed_ver = '3.6.0E'; # 3.8xS else if (ver == '3.8.0S' || ver == '3.8.1S' || ver == '3.8.2S') fixed_ver = '3.10.2S'; # 3.9xS else if (ver == '3.9.0S' || ver == '3.9.1S') fixed_ver = '3.10.2S'; # 3.10xS else if (ver == '3.10.0S' || ver == '3.10.1S') fixed_ver = '3.10.2S'; if (fixed_ver) flag++; if (get_kb_item("Host/local_checks_enabled")) { if (flag) { flag = 0; buf = cisco_command_kb_item("Host/Cisco/Config/show_ipv6_interface", "show ipv6 interface"); if (check_cisco_result(buf)) { if (preg(multiline: TRUE, pattern:"IPv6\s+is\s+enabled", string:buf)) { flag = 1; } } else if (cisco_needs_enable(buf)) { flag = 1; override = 1; } } } if (flag) { 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)); exit(0); } else audit(AUDIT_HOST_NOT, "affected");
NASL family CISCO NASL id CISCO-SA-20140326-IPV6.NASL description 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 IPv6 protocol stack. This issue exists due to improper handling of certain, unspecified types of IPv6 packets. An unauthenticated, remote attacker could potentially exploit this issue by sending a specially crafted IPv6 packet resulting in a denial of service. Note that this only affects hosts with IPv6 enabled. last seen 2019-10-28 modified 2014-04-04 plugin id 73344 published 2014-04-04 reporter This script is Copyright (C) 2014-2018 Tenable Network Security, Inc. source https://www.tenable.com/plugins/nessus/73344 title Cisco IOS Software IPv6 Denial of Service (cisco-sa-20140326-ipv6 code #TRUSTED 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 # # (C) Tenable Network Security, Inc. # include("compat.inc"); if (description) { script_id(73344); script_version("1.8"); script_set_attribute(attribute:"plugin_modification_date", value:"2018/11/15"); script_cve_id("CVE-2014-2113"); script_bugtraq_id(66467); script_xref(name:"CISCO-BUG-ID", value:"CSCui59540"); script_xref(name:"CISCO-SA", value:"cisco-sa-20140326-ipv6"); script_name(english:"Cisco IOS Software IPv6 Denial of Service (cisco-sa-20140326-ipv6"); 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 IPv6 protocol stack. This issue exists due to improper handling of certain, unspecified types of IPv6 packets. An unauthenticated, remote attacker could potentially exploit this issue by sending a specially crafted IPv6 packet resulting in a denial of service. Note that this only affects hosts with IPv6 enabled."); # https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20140326-ipv6 script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?0ffd6d00"); script_set_attribute(attribute:"see_also", value:"https://tools.cisco.com/security/center/viewAlert.x?alertId=33351"); script_set_attribute(attribute:"solution", value: "Apply the relevant patch referenced in Cisco Security Advisory cisco-sa-20140326-ipv6."); 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"); script_set_attribute(attribute:"vuln_publication_date", value:"2014/03/26"); script_set_attribute(attribute:"patch_publication_date", value:"2014/01/31"); script_set_attribute(attribute:"plugin_publication_date", value:"2014/04/04"); 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"); flag = 0; override = 0; report = ""; fixed_ver = ""; cbi = "CSCui59540"; ver = get_kb_item_or_exit("Host/Cisco/IOS/Version"); #15.2E if (ver == "15.2(1)E" || ver == "15.2(1)E1") fixed_ver = "15.2(1)E2"; #15.2EY else if (ver == "15.2(1)EY") fixed_ver = "15.2(1)E2"; #15.2GC else if (ver == "15.2(4)GC") fixed_ver = "15.2(4)GC1"; #15.2JA else if (ver == "15.2(4)JA" || ver == "15.2(4)JA1") fixed_ver = "Refer to the vendor for a fix."; #15.2JAY else if (ver == "15.2(4)JAY") fixed_ver = "Refer to the vendor for a fix."; #15.2JB else if (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") fixed_ver = "Refer to the vendor for a fix."; #15.2JN else if (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") fixed_ver = "15.2(4)M6"; #15.2S else if (ver == "15.2(4)S" || ver == "15.2(4)S0c" || ver == "15.2(4)S1" || ver == "15.2(4)S2" || ver == "15.2(4)S3" || ver == "15.2(4)S3a" || ver == "15.2(4)S4" || ver == "15.2(4)S4a") fixed_ver = "15.2(4)S5"; #15.2XB else if (ver == "15.2(4)XB10") fixed_ver = "Refer to the vendor for a fix."; #15.3M else if (ver == "15.3(3)M" || ver == "15.3(3)M1") fixed_ver = "15.3(3)M2"; #15.3S else if (ver == "15.3(1)S" || ver == "15.3(1)S1" || ver == "15.3(1)S1e" || ver == "15.3(1)S2" || ver == "15.3(2)S" || ver == "15.3(2)S0a" || ver == "15.3(2)S0xa" || ver == "15.3(2)S1" || ver == "15.3(2)S1b" || ver == "15.3(2)S1c" || ver == "15.3(2)S2" || ver == "15.3(3)S" || ver == "15.3(3)S0b" || ver == "15.3(3)S1" || ver == "15.3(3)S1a") fixed_ver = "15.3(3)S2"; #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(2)T" || ver == "15.3(2)T1" || ver == "15.3(2)T2") fixed_ver = "15.3(2)T3 / 15.3(1)T4"; if (fixed_ver) flag++; if (get_kb_item("Host/local_checks_enabled")) { if (flag) { flag = 0; buf = cisco_command_kb_item("Host/Cisco/Config/show_ipv6_interface", "show ipv6 interface"); if (check_cisco_result(buf)) { if (preg(multiline: TRUE, pattern:"IPv6\s+is\s+enabled", string:buf)) { flag = 1; } } else if (cisco_needs_enable(buf)) { flag = 1; override = 1; } } } if (flag) { 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)); exit(0); } else audit(AUDIT_HOST_NOT, "affected");