8.6

CVE-2018-0173

Warnung
A vulnerability in the Cisco IOS Software and Cisco IOS XE Software function that restores encapsulated option 82 information in DHCP Version 4 (DHCPv4) packets could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a Relay Reply denial of service (DoS) condition. The vulnerability exists because the affected software performs incomplete input validation of encapsulated option 82 information that it receives in DHCPOFFER messages from DHCPv4 servers. An attacker could exploit this vulnerability by sending a crafted DHCPv4 packet to an affected device, which the device would then forward to a DHCPv4 server. When the affected software processes the option 82 information that is encapsulated in the response from the server, an error could occur. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition. Cisco Bug IDs: CSCvg62754.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Cisco ≫ Ios Versiondenali-16.3.4
   Cisco ≫ 4321 Integrated Services Router Version-
   Cisco ≫ 4331 Integrated Services Router Version-
   Cisco ≫ 4351 Integrated Services Router Version-
   Cisco ≫ 4431 Integrated Services Router Version-
   Cisco ≫ 4451-x Integrated Services Router Version-
   Cisco ≫ Asr 1001-hx Version-
   Cisco ≫ Asr 1001-x Version-
   Cisco ≫ Asr 1002-hx Version-
   Cisco ≫ Asr 1002-x Version-
   Cisco ≫ Cloud Services Router 1000v Version-
Cisco ≫ Ios Xe Versiondenali-16.3.4
   Cisco ≫ 4321 Integrated Services Router Version-
   Cisco ≫ 4331 Integrated Services Router Version-
   Cisco ≫ 4351 Integrated Services Router Version-
   Cisco ≫ 4431 Integrated Services Router Version-
   Cisco ≫ 4451-x Integrated Services Router Version-
   Cisco ≫ Asr 1001-hx Version-
   Cisco ≫ Asr 1001-x Version-
   Cisco ≫ Asr 1002-hx Version-
   Cisco ≫ Asr 1002-x Version-
   Cisco ≫ Cloud Services Router 1000v Version-
Cisco ≫ Ios Version <= 15.2\(4a\)ea5
Cisco ≫ Ios Xe Version <= 15.2\(4a\)ea5

03.03.2022: CISA Known Exploited Vulnerabilities (KEV) Catalog

Cisco IOS and IOS XE Software Improper Input Validation Vulnerability

Schwachstelle

A vulnerability in the Cisco IOS Software and Cisco IOS XE Software function that restores encapsulated option 82 information in DHCP Version 4 (DHCPv4) packets can allow for denial-of-service (DoS).

Beschreibung

Apply updates per vendor instructions.

Erforderliche Maßnahmen
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 7.61% 0.938
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 8.6 3.9 4
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
nvd@nist.gov 7.8 10 6.9
AV:N/AC:L/Au:N/C:N/I:N/A:C
134c704f-9b21-4f2e-91b3-4a467353bcc0 8.6 3.9 4
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
CWE-20 Improper Input Validation

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.

https://ics-cert.us-cert.gov/advisories/ICSA-18-107-05
Third Party Advisory
US Government Resource
https://ics-cert.us-cert.gov/advisories/ICSA-18-107-04
Third Party Advisory
US Government Resource
http://www.securitytracker.com/id/1040591
Third Party Advisory
Broken Link
VDB Entry
https://www.tenable.com/security/research/tra-2018-06
Third Party Advisory
http://www.securityfocus.com/bid/103545
Third Party Advisory
Broken Link
VDB Entry
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-dhcpr2
Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-0173
US Government Resource