Cisco IOS/IOS XE Diagnostic Shell path traversal

CVSS Meta Temp Score
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CTI Interest Score
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5.2$0-$5k0.00

Summaryinfo

A vulnerability has been found in Cisco IOS and IOS XE and classified as critical. This affects an unknown part of the component Diagnostic Shell. Performing a manipulation results in path traversal. This vulnerability was named CVE-2018-0123. The attack needs to be approached locally. There is no available exploit. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Cisco IOS and IOS XE (Router Operating System) (the affected version unknown). It has been classified as critical. This affects an unknown part of the component Diagnostic Shell. The manipulation with an unknown input leads to a path traversal vulnerability. CWE is classifying the issue as CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

A Path Traversal vulnerability in the diagnostic shell for Cisco IOS and IOS XE Software could allow an authenticated, local attacker to use certain diagnostic shell commands that can overwrite system files. These system files may be sensitive and should not be able to be overwritten by a user of the diagnostic shell. The vulnerability is due to lack of proper input validation for certain diagnostic shell commands. An attacker could exploit this vulnerability by authenticating to the device, entering the diagnostic shell, and providing crafted user input to commands at the local diagnostic shell CLI. Successful exploitation could allow the attacker to overwrite system files that should be restricted. Cisco Bug IDs: CSCvg41950.

The bug was discovered 02/07/2018. The weakness was presented 02/08/2018 (Website). It is possible to read the advisory at securitytracker.com. This vulnerability is uniquely identified as CVE-2018-0123 since 11/27/2017. Attacking locally is a requirement. A authentication is necessary for exploitation. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1006 according to MITRE ATT&CK.

The vulnerability scanner Nessus provides a plugin with the ID 107091 (Cisco IOS XE Software Diagnostic Shell Path Traversal Vulnerability (cisco-sa-20180207-ios)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family CISCO and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 316189 (Cisco IOS and IOS XE Software IOS Diagnostic Shell Path Traversal Vulnerability (cisco-sa-20180207-ios)).

Upgrading eliminates this vulnerability. A possible mitigation has been published before and not just after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (107091) and SecurityFocus (BID 102967†). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.4
VulDB Meta Temp Score: 5.3

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Path traversal
CWE: CWE-22
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 107091
Nessus Name: Cisco IOS XE Software Diagnostic Shell Path Traversal Vulnerability (cisco-sa-20180207-ios)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Timelineinfo

11/27/2017 🔍
02/07/2018 +72 days 🔍
02/07/2018 +0 days 🔍
02/07/2018 +0 days 🔍
02/08/2018 +1 days 🔍
02/08/2018 +0 days 🔍
02/08/2018 +0 days 🔍
03/01/2018 +21 days 🔍
02/02/2021 +1069 days 🔍

Sourcesinfo

Vendor: cisco.com

Advisory: securitytracker.com⛔
Status: Not defined
Confirmation: 🔍

CVE: CVE-2018-0123 (🔍)
GCVE (CVE): GCVE-0-2018-0123
GCVE (VulDB): GCVE-100-112983
SecurityFocus: 102967 - Cisco IOS and IOS XE Software CVE-2018-0123 Local Arbitrary File Overwrite Vulnerability
SecurityTracker: 1040346

scip Labs: https://www.scip.ch/en/?labs.20150108

Entryinfo

Created: 02/08/2018 18:19
Updated: 02/02/2021 17:36
Changes: 02/08/2018 18:19 (68), 01/02/2020 17:49 (5), 02/02/2021 17:36 (2)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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