Vulnerabilities > CVE-2018-0174 - 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
HIGH Summary
A vulnerability in the DHCP option 82 encapsulation functionality of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a denial of service (DoS) condition. The vulnerability exists because the affected software performs incomplete input validation of option 82 information that it receives in DHCP Version 4 (DHCPv4) packets from DHCP relay agents. An attacker could exploit this vulnerability by sending a crafted DHCPv4 packet to an affected device. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition. Cisco Bug IDs: CSCuh91645.
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-20180328-DHCPR3-IOS.NASL description According to its self-reported version, the Cisco IOS software running on the remote device is affected by multiple denial of service vulnerabilities in the DHCP client implementation when parsing DHCP packets. An unauthenticated, remote attacker can exploit these issues, via specially crafted DHCP packets, to cause the device to reload. last seen 2020-06-01 modified 2020-06-02 plugin id 109087 published 2018-04-17 reporter This script is Copyright (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/109087 title Cisco IOS DHCP Multiple Vulnerabilities code #TRUSTED 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 # # (C) Tenable Network Security, Inc. # include("compat.inc"); if (description) { script_id(109087); script_version("1.6"); script_cvs_date("Date: 2019/11/08"); script_cve_id("CVE-2018-0172", "CVE-2018-0173", "CVE-2018-0174"); script_bugtraq_id(103545, 103552, 103554); script_xref(name:"TRA", value:"TRA-2018-06"); script_xref(name:"CISCO-BUG-ID", value:"CSCvg62730"); script_xref(name:"CISCO-BUG-ID", value:"CSCvg62754"); script_xref(name:"CISCO-BUG-ID", value:"CSCuh91645"); script_xref(name:"CISCO-SA", value:"cisco-sa-20180328-dhcpr1"); script_xref(name:"CISCO-SA", value:"cisco-sa-20180328-dhcpr2"); script_xref(name:"CISCO-SA", value:"cisco-sa-20180328-dhcpr3"); script_name(english:"Cisco IOS DHCP Multiple Vulnerabilities"); 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 Cisco IOS software running on the remote device is affected by multiple denial of service vulnerabilities in the DHCP client implementation when parsing DHCP packets. An unauthenticated, remote attacker can exploit these issues, via specially crafted DHCP packets, to cause the device to reload."); # https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-dhcpr1 script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?bfe8b7e0"); # https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-dhcpr2 script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?2af6e16d"); # https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-dhcpr3 script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?570bb167"); script_set_attribute(attribute:"see_also", value:"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvg62730"); script_set_attribute(attribute:"see_also", value:"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvg62754"); script_set_attribute(attribute:"see_also", value:"https://bst.cloudapps.cisco.com/bugsearch/bug/CSCuh91645"); script_set_attribute(attribute:"see_also", value:"https://www.tenable.com/security/research/tra-2018-06"); script_set_attribute(attribute:"solution", value: "Upgrade to the relevant fixed version referenced in Cisco bug ID CSCvg62730, CSCvg62754, and CSCuh91645."); 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_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H"); script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C"); script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available"); script_set_attribute(attribute:"vuln_publication_date", value:"2018/03/28"); script_set_attribute(attribute:"patch_publication_date", value:"2018/03/28"); script_set_attribute(attribute:"plugin_publication_date", value:"2018/04/17"); script_set_attribute(attribute:"plugin_type", value:"combined"); script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:ios"); script_end_attributes(); script_category(ACT_GATHER_INFO); script_family(english:"CISCO"); script_copyright(english:"This script is Copyright (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof."); 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; ver = get_kb_item_or_exit("Host/Cisco/IOS/Version"); # Check for vuln versions if ( ver == '12.2(53)SE1' || ver == '12.2(55)SE' || ver == '12.2(46)SE' || ver == '12.2(46)SE2' || ver == '12.2(50)SE2' || ver == '12.2(50)SE1' || ver == '12.2(44)SE2' || ver == '12.2(50)SE5' || ver == '12.2(44)SE1' || ver == '12.2(53)SE' || ver == '12.2(44)SE4' || ver == '12.2(55)SE3' || ver == '12.2(55)SE2' || ver == '12.2(44)SE' || ver == '12.2(52)SE' || ver == '12.2(58)SE' || ver == '12.2(50)SE3' || ver == '12.2(55)SE1' || ver == '12.2(44)SE6' || ver == '12.2(44)SE3' || ver == '12.2(53)SE2' || ver == '12.2(52)SE1' || ver == '12.2(46)SE1' || ver == '12.2(54)SE' || ver == '12.2(44)SE5' || ver == '12.2(50)SE4' || ver == '12.2(50)SE' || ver == '12.2(58)SE1' || ver == '12.2(55)SE4' || ver == '12.2(58)SE2' || ver == '12.2(55)SE5' || ver == '12.2(55)SE6' || ver == '12.2(55)SE7' || ver == '12.2(55)SE8' || ver == '12.2(55)SE9' || ver == '12.2(55)SE10' || ver == '12.2(55)SE11' || ver == '12.2(55)SE12' || ver == '12.2(55)SE13' || ver == '12.2(44)EX' || ver == '12.2(53)EX' || ver == '12.2(52)EX' || ver == '12.2(44)EX1' || ver == '12.2(55)EX' || ver == '12.2(46)EX' || ver == '12.2(52)EX1' || ver == '12.2(55)EX1' || ver == '12.2(55)EX2' || ver == '12.2(55)EX3' || ver == '12.2(58)EX' || ver == '12.2(46)EY' || ver == '12.2(55)EY' || ver == '12.2(52)EY1' || ver == '12.2(44)EY' || ver == '12.2(52)EY' || ver == '12.2(53)EY' || ver == '12.2(52)EY2' || ver == '12.2(52)EY1b' || ver == '12.2(52)EY1c' || ver == '12.2(58)EY' || ver == '12.2(52)EY3' || ver == '12.2(52)EY2a' || ver == '12.2(58)EY1' || ver == '12.2(52)EY4' || ver == '12.2(52)EY3a' || ver == '12.2(58)EY2' || ver == '12.2(58)EZ' || ver == '12.2(53)EZ' || ver == '12.2(55)EZ' || ver == '12.2(60)EZ' || ver == '12.2(60)EZ1' || ver == '12.2(60)EZ2' || ver == '12.2(60)EZ3' || ver == '12.2(60)EZ4' || ver == '12.2(60)EZ5' || ver == '12.2(60)EZ6' || ver == '12.2(60)EZ7' || ver == '12.2(60)EZ8' || ver == '12.2(60)EZ9' || ver == '12.2(60)EZ10' || ver == '12.2(60)EZ11' || ver == '12.2(60)EZ12' || ver == '12.2(50)SG3' || ver == '12.2(50)SG6' || ver == '12.2(53)SG1' || ver == '12.2(46)SG' || ver == '12.2(53)SG2' || ver == '12.2(50)SG5' || ver == '12.2(53)SG3' || ver == '12.2(50)SG8' || ver == '12.2(50)SG2' || ver == '12.2(54)SG1' || ver == '12.2(50)SG1' || ver == '12.2(52)SG' || ver == '12.2(54)SG' || ver == '12.2(50)SG' || ver == '12.2(50)SG7' || ver == '12.2(53)SG4' || ver == '12.2(50)SG4' || ver == '12.2(46)SG1' || ver == '12.2(53)SG5' || ver == '12.2(53)SG6' || ver == '12.2(53)SG7' || ver == '12.2(53)SG8' || ver == '12.2(53)SG9' || ver == '12.2(53)SG10' || ver == '12.2(53)SG11' || ver == '12.2(33)SRD7' || ver == '12.2(33)SRD6' || ver == '12.2(33)SRD2a' || ver == '12.2(33)SRD4' || ver == '12.2(33)SRD5' || ver == '12.2(33)SRD3' || ver == '12.2(33)SRD2' || ver == '12.2(33)SRD1' || ver == '12.2(33)SRD' || ver == '12.2(33)SRD8' || ver == '12.2(52)XO' || ver == '12.2(54)XO' || ver == '12.2(50)SQ2' || ver == '12.2(50)SQ1' || ver == '12.2(50)SQ' || ver == '12.2(50)SQ3' || ver == '12.2(50)SQ4' || ver == '12.2(50)SQ5' || ver == '12.2(50)SQ6' || ver == '12.2(50)SQ7' || ver == '12.2(33)SRE1' || ver == '12.2(33)SRE2' || ver == '12.2(33)SRE3' || ver == '12.2(33)SRE4' || ver == '12.2(33)SRE' || ver == '12.2(33)SRE0a' || ver == '12.2(33)SRE5' || ver == '12.2(33)SRE6' || ver == '12.2(33)SRE8' || ver == '12.2(33)SRE7' || ver == '12.2(33)SRE9' || ver == '12.2(33)SRE7a' || ver == '12.2(33)SRE10' || ver == '12.2(33)SRE11' || ver == 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'15.0(2)EX12' || ver == '15.1(2)EY' || ver == '15.1(2)EY1a' || ver == '15.1(2)EY2' || ver == '15.1(2)EY3' || ver == '15.1(2)EY2a' || ver == '15.1(2)EY4' || ver == '15.1(2)SNG' || ver == '15.3(1)S' || ver == '15.3(2)S' || ver == '15.3(3)S' || ver == '15.3(1)S2' || ver == '15.3(1)S1' || ver == '15.3(2)S2' || ver == '15.3(2)S1' || ver == '15.3(3)S1' || ver == '15.3(3)S2' || ver == '15.3(3)S3' || ver == '15.3(3)S6' || ver == '15.3(3)S4' || ver == '15.3(3)S1a' || ver == '15.3(3)S5' || ver == '15.3(3)S7' || ver == '15.3(3)S8' || ver == '15.3(3)S9' || ver == '15.3(3)S10' || ver == '15.3(3)S8a' || ver == '15.1(2)SNH' || ver == '15.1(2)SNI' || ver == '15.1(2)SNI1' || ver == '15.2(2)SNG' || ver == '15.0(2)EC' || ver == '15.0(2)EB' || ver == '15.2(1)E' || ver == '15.2(2)E' || ver == '15.2(1)E1' || ver == '15.2(3)E' || ver == '15.2(1)E2' || ver == '15.2(1)E3' || ver == '15.2(2)E1' || ver == '15.2(4)E' || ver == '15.2(3)E1' || ver == '15.2(2)E2' || ver == '15.2(2a)E1' || ver == '15.2(2)E3' || ver == '15.2(2a)E2' || ver == '15.2(3)E2' || ver == '15.2(3a)E' || ver == '15.2(3)E3' || ver == '15.2(3m)E2' || ver == '15.2(4)E1' || ver == '15.2(2)E4' || ver == '15.2(2)E5' || ver == '15.2(4)E2' || ver == '15.2(4m)E1' || ver == '15.2(3)E4' || ver == '15.2(5)E' || ver == '15.2(4)E3' || ver == '15.2(2)E6' || ver == '15.2(5a)E' || ver == '15.2(5)E1' || ver == '15.2(5b)E' || ver == '15.2(4m)E3' || ver == '15.2(3m)E8' || ver == '15.2(2)E5a' || ver == '15.2(5c)E' || ver == '15.2(3)E5' || ver == '15.2(2)E5b' || ver == '15.2(4n)E2' || ver == '15.2(4o)E2' || ver == '15.2(5a)E1' || ver == '15.2(4)E4' || ver == '15.2(2)E7' || ver == '15.2(5)E2' || ver == '15.2(4p)E1' || ver == '15.2(6)E' || ver == '15.2(5)E2b' || ver == '15.2(4)E5' || ver == '15.2(5)E2c' || ver == '15.2(2)E8' || ver == '15.2(4m)E2' || ver == '15.2(4o)E3' || ver == '15.2(4q)E1' || ver == '15.2(6)E0a' || ver == '15.2(6)E0b' || ver == '15.2(2)E7b' || ver == '15.2(4)E5a' || ver == '15.2(6)E0c' || ver == '15.2(2)E9' || ver == '15.1(3)MRA' || ver == '15.1(3)MRA1' || ver == '15.1(3)MRA2' || ver == '15.1(3)MRA3' || ver == '15.1(3)MRA4' || ver == '15.2(2)SNH1' || ver == '15.0(2)ED' || ver == '15.0(2)ED1' || ver == '15.4(1)S' || ver == '15.4(2)S' || ver == '15.4(3)S' || ver == '15.4(1)S1' || ver == '15.4(1)S2' || ver == '15.4(2)S1' || ver == '15.4(1)S3' || ver == '15.4(3)S1' || ver == '15.4(2)S2' || ver == '15.4(3)S2' || ver == '15.4(3)S3' || ver == '15.4(1)S4' || ver == '15.4(2)S3' || ver == '15.4(2)S4' || ver == '15.4(3)S4' || ver == '15.4(3)S5' || ver == '15.4(3)S6' || ver == '15.4(3)S7' || ver == '15.4(3)S6a' || ver == '15.4(3)S8' || ver == '15.2(2)SNI' || ver == '15.0(2)EZ' || ver == '15.2(1)EY' || ver == '15.0(2)EJ' || ver == '15.0(2)EJ1' || ver == '15.0(2)EH' || ver == '15.2(5)EX' || ver == '15.0(2)EK' || ver == '15.0(2)EK1' || ver == '15.5(1)S' || ver == '15.5(2)S' || ver == '15.5(1)S1' || ver == '15.5(3)S' || ver == '15.5(1)S2' || ver == '15.5(1)S3' || ver == '15.5(2)S1' || ver == '15.5(2)S2' || ver == '15.5(3)S1' || ver == '15.5(3)S1a' || ver == '15.5(2)S3' || ver == '15.5(3)S2' || ver == '15.5(3)S0a' || ver == '15.5(3)S3' || ver == '15.5(1)S4' || ver == '15.5(2)S4' || ver == '15.5(3)S4' || ver == '15.5(3)S5' || ver == '15.5(3)S6' || ver == '15.5(3)S6a' || ver == '15.5(3)S6b' || ver == '15.1(3)SVG' || ver == '15.2(2)EB' || ver == '15.2(2)EB1' || ver == '15.2(2)EB2' || ver == '15.5(3)SN' || ver == '15.0(2)SQD' || ver == '15.0(2)SQD1' || ver == '15.0(2)SQD2' || ver == '15.0(2)SQD3' || ver == '15.0(2)SQD4' || ver == '15.0(2)SQD5' || ver == '15.0(2)SQD6' || ver == '15.0(2)SQD7' || ver == '15.6(1)S' || ver == '15.6(2)S' || ver == '15.6(2)S1' || ver == '15.6(1)S1' || ver == '15.6(1)S2' || ver == '15.6(2)S0a' || ver == '15.6(2)S2' || ver == '15.6(1)S3' || ver == '15.6(2)S3' || ver == '15.6(1)S4' || ver == '15.6(2)S4' || ver == '15.6(2)SP' || ver == '15.6(2)SP1' || ver == '15.6(2)SP2' || ver == '15.6(2)SP3' || ver == '15.6(2)SP3b' || ver == '15.6(2)SN' || ver == '15.1(3)SVJ2' || ver == '15.2(4)EC1' || ver == '15.2(4)EC2' ) flag++; cmds = make_list(); if (flag && get_kb_item("Host/local_checks_enabled")) { flag = 0; buf = cisco_command_kb_item("Host/Cisco/Config/show running-config | include ip helper-address", "show running-config | include ip helper-address"); if (check_cisco_result(buf)) { if (preg(string:buf, pattern:"ip helper-address", multiline:TRUE)) { cmds = make_list(cmds, "show running-config | include ip helper-address"); buf2 = cisco_command_kb_item("Host/Cisco/Config/show running-config | include ip dhcp relay information option", "show running-config | include ip dhcp relay information option"); if (check_cisco_result(buf2)) { if (preg(multiline:TRUE, pattern:"ip dhcp relay information option", string:buf2)) { cmds = make_list(cmds,"show running-config | include ip dhcp relay information option"); flag = 1; } } } } else if (cisco_needs_enable(buf)) override = 1; if (!flag && !override) audit(AUDIT_OS_CONF_NOT_VULN, "Cisco IOS", ver); } if (flag || override) { security_report_cisco( port : 0, severity : SECURITY_HOLE, override : override, version : ver, bug_id : "CSCvg62730, CSCvg62754, CSCuh91645", cmds : cmds ); exit(0); } else audit(AUDIT_HOST_NOT, "affected");NASL family CISCO NASL id CISCO-SA-20180328-DHCPR3-IOSXE.NASL description According to its self-reported version, the Cisco IOS software running on the remote device is affected by multiple denial of service vulnerabilities in the DHCP client implementation when parsing DHCP packets. An unauthenticated, remote attacker can exploit these issues, via specially crafted DHCP packets, to cause the device to reload. last seen 2020-06-01 modified 2020-06-02 plugin id 109088 published 2018-04-17 reporter This script is Copyright (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/109088 title Cisco IOS DHCP Multiple Vulnerabilities
References
- http://www.securityfocus.com/bid/103554
- http://www.securityfocus.com/bid/103554
- http://www.securitytracker.com/id/1040591
- http://www.securitytracker.com/id/1040591
- https://ics-cert.us-cert.gov/advisories/ICSA-18-107-04
- https://ics-cert.us-cert.gov/advisories/ICSA-18-107-04
- https://ics-cert.us-cert.gov/advisories/ICSA-18-107-05
- https://ics-cert.us-cert.gov/advisories/ICSA-18-107-05
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-dhcpr3
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-dhcpr3
- https://www.tenable.com/security/research/tra-2018-06
- https://www.tenable.com/security/research/tra-2018-06