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AUSCERT External Security Bulletin Redistribution
ESB-2020.3304
Cisco IOS XE Software Privilege Escalation Vulnerabilities
25 September 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco IOS XE Software
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Increased Privileges -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2020-3425 CVE-2020-3141
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ios-webui-priv-esc-K8zvEWM
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Cisco IOS XE Software Privilege Escalation Vulnerabilities
Priority: High
Advisory ID: cisco-sa-ios-webui-priv-esc-K8zvEWM
First Published: 2020 September 24 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds availableCisco Bug IDs: CSCvs40347CSCvu90974
CVE-2020-3141
CVE-2020-3425
CWE-20
CWE-532
Summary
o Multiple vulnerabilities in the web management framework of Cisco IOS XE
Software could allow an authenticated, remote attacker with read-only
privileges to elevate privileges to the level of an Administrator user on
an affected device.
For more information about these vulnerabilities, see the Details section
of this advisory.
Cisco has released software updates that address these vulnerabilities.
There are no workarounds that address these vulnerabilities.
This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
cisco-sa-ios-webui-priv-esc-K8zvEWM
This advisory is part of the September 24, 2020, release of the Cisco IOS
and IOS XE Software Security Advisory Bundled Publication, which includes
25 Cisco Security Advisories that describe 34 vulnerabilities. For a
complete list of the advisories and links to them, see Cisco Event
Response: September 2020 Semiannual Cisco IOS and IOS XE Software Security
Advisory Bundled Publication .
Affected Products
o Vulnerable Products
These vulnerabilities affect Cisco devices if they are running a vulnerable
release of Cisco IOS XE Software and have the HTTP server enabled. The
default state of the HTTP Server feature in Cisco IOS XE Software is
version dependent.
For information about which Cisco software releases are vulnerable, see the
Fixed Software section of this advisory.
Determine the HTTP Server Configuration
To determine whether the HTTP Server feature is enabled for a device, log
in to the device and use the show running-config | include ip http server|
secure|active command in the CLI to check for the presence of the ip http
server command or the ip http secure-server command in the global
configuration. If either command is present and configured, the HTTP Server
feature is enabled for the device.
The following example shows the output of the show running-config | include
ip http server|secure|active command for a device that has the HTTP Server
feature enabled:
Router# show running-config | include ip http server|secure|active
ip http server
ip http secure-server
Note: The presence of either command or both commands in the device
configuration indicates that the web UI feature is enabled.
If the ip http server command is present and the configuration also
contains ip http active-session-modules none , the vulnerabilities are not
exploitable over HTTP.
If the ip http secure-server command is present and the configuration also
contains ip http secure-active-session-modules none , the vulnerabilities
are not exploitable over HTTPS.
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory
are known to be affected by these vulnerabilities.
Cisco has confirmed that these vulnerabilities do not affect the following
Cisco products:
IOS Software
IOS XR Software
NX-OS Software
Details
o The vulnerabilities are not dependent on one another. Exploitation of one
of the vulnerabilities is not required to exploit the other vulnerability.
In addition, a software release that is affected by one of the
vulnerabilities may not be affected by the other vulnerability.
Details about the vulnerabilities are as follows.
Cisco IOS XE Web Management Software Privilege Escalation Vulnerability
A vulnerability in the APIs of the web management framework of Cisco IOS XE
Software could allow an authenticated, remote attacker with read-only
privileges to elevate privileges to the level of an Administrator user on
an affected device.
The vulnerability is due to a lack of input and validation checking
mechanisms for certain HTTP requests to APIs on an affected device. An
attacker could exploit this vulnerability by sending a modified HTTP
request to the affected device. An exploit could allow the attacker as a
read-only user to execute CLI commands or configuration changes as if they
were an administrative user.
Cisco has released software updates that address this vulnerability. There
are no workarounds that address this vulnerability.
Bug ID(s): CSCvu90974
CVE ID: CVE-2020-3141
Security Impact Rating (SIR): High
CVSS Base Score: 8.8
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Cisco IOS XE Web Management Software Privilege Escalation Vulnerability
A vulnerability in the authentication controls of the web management
framework of Cisco IOS XE Software could allow an authenticated, remote
attacker with read-only privileges to elevate privileges to the level of an
Administrator user on an affected device.
The vulnerability is due to insufficient data protection of sensitive
information. An attacker with read-only privileges could exploit this
vulnerability by sending a crafted API call. A successful exploit could
allow the attacker to obtain a privileged authentication token, which the
attacker could use to elevate their privileges to the level of an
administrative user on the affected device.
Cisco has released software updates that address this vulnerability. There
are no workarounds that address this vulnerability.
Bug ID(s): CSCvs40347
CVE ID: CVE-2020-3425
Security Impact Rating (SIR): High
CVSS Base Score: 8.8
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Workarounds
o There are no workarounds that address these vulnerabilities.
Disabling the HTTP Server feature eliminates the attack vector for these
vulnerabilities and may be a suitable mitigation until affected devices can
be upgraded. To disable the HTTP Server feature, use the no ip http server
or no ip http secure-server command in global configuration mode. If both
the HTTP server and HTTPS server are in use, both commands are required to
disable the HTTP Server feature.
Fixed Software
o Cisco has released free software updates that address the vulnerabilities
described in this advisory. Customers may only install and expect support
for software versions and feature sets for which they have purchased a
license. By installing, downloading, accessing, or otherwise using such
software upgrades, customers agree to follow the terms of the Cisco
software license:
https://www.cisco.com/c/en/us/products/end-user-license-agreement.html
Additionally, customers may only download software for which they have a
valid license, procured from Cisco directly, or through a Cisco authorized
reseller or partner. In most cases this will be a maintenance upgrade to
software that was previously purchased. Free security software updates do
not entitle customers to a new software license, additional software
feature sets, or major revision upgrades.
When considering software upgrades , customers are advised to regularly
consult the advisories for Cisco products, which are available from the
Cisco Security Advisories 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.
Customers Without Service Contracts
Customers who purchase directly from Cisco but do not hold a Cisco service
contract and customers who make purchases through third-party vendors but
are unsuccessful in obtaining fixed software through their point of sale
should obtain upgrades by contacting the Cisco TAC: https://www.cisco.com/c
/en/us/support/web/tsd-cisco-worldwide-contacts.html
Customers should have the product serial number available and be prepared
to provide the URL of this advisory as evidence of entitlement to a free
upgrade.
Cisco IOS and IOS XE Software
To help customers determine their exposure to vulnerabilities in Cisco IOS
and IOS XE Software, Cisco provides the Cisco Software Checker to identify
any Cisco Security Advisories that impact a specific software release and
the earliest release that fixes the vulnerabilities described in each
advisory ("First Fixed"). If applicable, the tool also returns the earliest
release that fixes all the vulnerabilities described in all the advisories
identified ("Combined First Fixed").
Customers can use the Cisco Software Checker to search advisories in the
following ways:
Choose the software and one or more releases
Upload a .txt file that includes a list of specific releases
Enter the output of the show version command
After initiating a search, customers can customize the search to include
all Cisco Security Advisories, a specific advisory, or all advisories in
the most recent bundled publication.
Customers can also use the following form to determine whether a release is
affected by any Cisco Security Advisory by entering a Cisco IOS or IOS XE
Software release-for example, 15.1(4)M2 or 3.13.8S :
[ ] [Check]
By default, the Cisco Software Checker includes results only for
vulnerabilities that have a Critical or High Security Impact Rating (SIR).
To include results for Medium SIR vulnerabilities, customers can use the
Cisco Software Checker on Cisco.com and check the Medium check box in the
drop-down list under Impact Rating when customizing a search.
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.
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 vulnerabilities that are
described in this advisory.
Source
o Cisco would like to thank Kwangho Park (panghoddari) of KITRI BoB for
finding and reporting the vulnerability identified as CVE-2020-3425.
The vulnerability identified as CVE-2020-3141 was found during internal
security testing by P.W. of the Cisco Advanced Security Initiatives Group
(ASIG).
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.
Related to This Advisory
o Cisco Event Response: September 2020 Semiannual Cisco IOS and IOS XE
Software Security Advisory Bundled Publication
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
cisco-sa-ios-webui-priv-esc-K8zvEWM
Revision History
o +----------+---------------------------+----------+--------+--------------+
| Version | Description | Section | Status | Date |
+----------+---------------------------+----------+--------+--------------+
| 1.0 | Initial public release. | - | Final | 2020-SEP-24 |
+----------+---------------------------+----------+--------+--------------+
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This security bulletin is provided as a service to AusCERT's members. As
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NOTE: This is only the original release of the security bulletin. It may
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===========================================================================
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.
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