Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
===========================================================================
AUSCERT External Security Bulletin Redistribution
ESB-2018.0921
Cisco IOS XE Software REST API Authorization Bypass Vulnerability
29 March 2018
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco IOS XE
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Unauthorised Access -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2018-0195
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-rest
- --------------------------BEGIN INCLUDED TEXT--------------------
Cisco Security Advisory
Cisco IOS XE Software REST API Authorization Bypass Vulnerability
Medium
Advisory ID: cisco-sa-20180328-rest
First Published: 2018 March 28 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs:
CSCuz56428
CVE-2018-0195
CWE-287
CVSSÂ Score:
5.0 AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N/E:X/RL:X/RC:X
Summary
o A vulnerability in the Cisco IOS XE Software REST API could allow an
authenticated, remote attacker to bypass API authorization checks and use
the API to perform privileged actions on an affected device.
The vulnerability is due to insufficient authorization checks for requests
that are sent to the REST API of the affected software. An attacker could
exploit this vulnerability by sending a malicious request to an affected
device via the REST API. A successful exploit could allow the attacker to
selectively bypass authorization checks for the REST API of the affected
software and use the API to perform privileged actions on an affected
device.
There are no workarounds that address this vulnerability.
This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
cisco-sa-20180328-rest
Affected Products
o Vulnerable Products
This vulnerability affects Cisco devices that are running a vulnerable
release of Cisco IOS XE Software and are configured to support use of the
Cisco IOS XE Software REST API for device management.
For information about which Cisco IOS XE Software releases are vulnerable,
consult the Cisco bug ID(s) at the top of this advisory.
Determining the Cisco IOS XE Software Release
To determine which Cisco IOS XE Software release is running on a device,
administrators can log in to the device, use the show version command in
the CLI, and then refer to the system banner that appears. If the device is
running Cisco IOS XE Software, the system banner displays Cisco IOS
Software, Cisco IOS XE Software, or similar text.
The following example shows the output of the command for a device that is
running Cisco IOS XE Software Release 16.2.1 and has an installed image
name of CAT3K_CAA-UNIVERSALK9-M:
ios-xe-device# show version
Cisco IOS Software, Catalyst L3 Switch Software (CAT3K_CAA-UNIVERSALK9-M), Version Denali 16.2.1, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2016 by Cisco Systems, Inc.
Compiled Sun 27-Mar-16 21:47 by mcpre
.
.
.
For information about the naming and numbering conventions for Cisco IOS XE
Software releases, see the Cisco IOS and NX-OS Software Reference Guide.
Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by this
vulnerability.
Cisco has confirmed that this vulnerability does not affect Cisco IOS
Software, Cisco IOS XR Software, or Cisco NX-OS Software.
Workarounds
o There are no workarounds that address this vulnerability.
Fixed Software
o For detailed information about fixed software releases, consult the Cisco
bug ID(s) at the top of this advisory.
For a mapping of Cisco IOS XE Software releases to Cisco IOS Software
releases, refer to the Cisco IOS XE 2 Release Notes, Cisco IOS XE 3S
Release Notes, or Cisco IOS XE 3SG Release Notes, depending on the
Cisco IOS XE Software release.
When considering software upgrades, customers are advised to regularly
consult the advisories for Cisco products, which are available from the
Cisco Security Advisories and Alerts page, to determine exposure and a
complete upgrade solution.
In all cases, customers should ensure that the devices to be upgraded
contain sufficient memory and confirm that current hardware and software
configurations will continue to be supported properly by the new release.
If the information is not clear, customers are advised to contact the Cisco
Technical Assistance Center (TAC) or their contracted maintenance
providers.
Exploitation and Public Announcements
o The Cisco Product Security Incident Response Team (PSIRT) is not aware of
any public announcements or malicious use of the vulnerability that is
described in this advisory.
Source
o This vulnerability was found during internal security testing.
Cisco Security Vulnerability Policy
o To learn about Cisco security vulnerability disclosure policies and
publications, see the Security Vulnerability Policy. This document also
contains instructions for obtaining fixed software and receiving security
vulnerability information from Cisco.
Subscribe to Cisco Security Notifications
o Subscribe
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-rest
Revision History
o
+----------+----------------------------+----------+---------+----------------+
| Version | Description | Section | Status | Date |
+----------+----------------------------+----------+---------+----------------+
| 1.0 | Initial public release. | -- | Final | 2018-March-28 |
+----------+----------------------------+----------+---------+----------------+
- --------------------------END INCLUDED TEXT--------------------
You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.
NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members. As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.
NOTE: This is only the original release of the security bulletin. It may
not be updated when updates to the original are made. If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.
Contact information for the authors of the original document is included
in the Security Bulletin above. If you have any questions or need further
information, please contact them directly.
Previous advisories and external security bulletins can be retrieved from:
https://www.auscert.org.au/bulletins/
===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for member emergencies only.
===========================================================================
-----BEGIN PGP SIGNATURE-----
Comment: http://www.auscert.org.au/render.html?it=1967
iQIVAwUBWrxXdox+lLeg9Ub1AQgYSg//dRSOa9pAvXa/jW3Y9IUO9J5bHyerXryc
zl9Y0XqomlJl8vkHjKDzeDPoShblucxOd7fBWrdDkXi/RI7dG+4ZlwlNOwNzaj8t
AGm2dwKdNtrFNXL7gS1RU0vzJiZxsZMgvWKPA53VytSWGA5XH9iDbM6BCWinx6Kn
hHSF6QG1rrPRk/OZtQcDhyUBrKF5d3+eoC2hsQG8IYoV5mLhMYYg36kUSdZPGBOR
Hgvb4p9YaIvw34XHHlaMc/eAG2AESAIYxRHE+2NwbnVjvzr9ng8sh6ZKSJ2b2uzy
d5z7M/NVnRucwXokPydQNPCm0jfbOAsN+kiV14j9Yd4BFBIUOWOnaLtQRcPbomKd
RmQcSmkYTvRyOdGYv4yOyDzGqdeANgbIw7yasxd5L5EyghLQdyqxLh0uSDFN9m7E
QDU4DPJSfdGrpf4R3h/rUebpSssJG9MPuqfyr/ehZ1DpoXOIzB3AuvtxfcCVBijd
bJA/YeoxBiijZWvfGx3XFoDIt6AwQ4ghqYaYX3Zh7eNSBFpnC9jeo6xV/DdL7SEA
8iNuEUyhSraPITSRtq0EWibZL3W9HUV/iVk0IccXhSg7Kf5cs026WtOEFgaiWZNr
ia7+jAVSKcIFJIKW4zG6slZCLyfqfCf3O8dJC0t9XC8HwVEuvAXkzPXSirapcPjn
0eGcAnBdByc=
=BlYA
-----END PGP SIGNATURE-----