Cisco Security Advisory
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CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:X/RL:X/RC:X
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Multiple vulnerabilities in the REST API of Cisco UCS Director and Cisco UCS Director Express for Big Data may allow a remote attacker to bypass authentication or conduct directory traversal attacks 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://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ucsd-mult-vulns-UNfpdW4E
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Vulnerable Products
The following table lists Cisco products that are affected by one or more of the vulnerabilities that are described in this advisory:
Product Cisco Bug IDs Vulnerable Release(s) Fixed Release Cisco UCS Director CSCvs53496, CSCvs53493 CSCvs53500, CSCvs53502 CSCvs56400, CSCvs56401 CSCvs56399, CSCvs69171 CSCvs69022 6.0.0.0, 6.0.0.1, 6.0.1.0, 6.0.1.1, 6.0.1.2, 6.0.1.3
6.5.0.0, 6.5.0.1, 6.5.0.2, 6.5.0.3, 6.5.0.4
6.6.0.0, 6.6.1.0, 6.6.2.0
6.7.0.0, 6.7.1.0, 6.7.2.0, 6.7.3.0
6.7.4.0 Cisco UCS Director Express for Big Data CSCvt39561, CSCvt39555 CSCvt39580, CSCvt39565 CSCvt39535, CSCvt39526 CSCvt39575, CSCvt39489 3.7.3.0 and earlier 3.7.4.0 Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory are known to be affected by these vulnerabilities.
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Vulnerability Details
Details about the vulnerabilities are as follows.
Cisco UCS Director and UCS Director Express for Big Data Authentication Bypass Vulnerability
A vulnerability in the REST API of Cisco UCS Director and UCS Director Express for Big Data could allow an unauthenticated, remote attacker to bypass authentication and execute arbitrary actions with administrative privileges on an affected device.
The vulnerability is due to insufficient access control validation. An attacker could exploit this vulnerability by sending a crafted request to the REST API. A successful exploit could allow the attacker to interact with the REST API with administrative privileges.
Bug ID(s): CSCvs53496, CSCvt39580
CVE ID: CVE-2020-3243
Security Impact Rating (SIR): Critical
CVSS Base Score: 9.8
CVSS Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HCisco UCS Director and UCS Director Express for Big Data Remote Code Execution Vulnerability
A vulnerability in the REST API of Cisco UCS Director and UCS Director Express for Big Data could allow an authenticated, remote attacker to execute arbitrary code with root privileges on the underlying operating system.
The vulnerability is due to improper input validation. An attacker could exploit this vulnerability by crafting a malicious file and sending it to the REST API. A successful exploit could allow the attacker to open a remote shell and execute code with root privileges.
Bug ID(s): CSCvs56399, CSCvt39555
CVE ID: CVE-2020-3240
Security Impact Rating (SIR): High
CVSS Base Score: 8.8
CVSS Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HCisco UCS Director and UCS Director Express for Big Data Authentication Bypass Vulnerability
A vulnerability in the REST API of Cisco UCS Director and UCS Director Express for Big Data could allow an unauthenticated, remote attacker to bypass authentication and execute API calls on an affected device.
The vulnerability is due to insufficient access control validation. An attacker could exploit this vulnerability by sending a request to the REST API endpoint. A successful exploit could allow the attacker to interact with the REST API and cause a potential Denial of Service (DoS) condition on the affected device.
Bug ID(s): CSCvs53493, CSCvt39575
CVE ID: CVE-2020-3250
Security Impact Rating (SIR): High
CVSS Base Score: 8.6
CVSS Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:HCisco UCS Director and UCS Director Express for Big Data Directory Traversal Vulnerability
A vulnerability in the REST API of Cisco UCS Director and UCS Director Express for Big Data could allow an authenticated, remote attacker to conduct directory traversal attacks on an affected device.
The vulnerability is due to insufficient validation of user-supplied input to the REST API of the affected software. An attacker could exploit this vulnerability by sending a crafted request to the REST API. A successful exploit could allow the attacker to execute code on the system.
Bug ID(s): CSCvs69171, CSCvt39489
CVE ID: CVE-2020-3251
Security Impact Rating (SIR): High
CVSS Base Score: 8.1
CVSS Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:HCisco UCS Director and UCS Director Express for Big Data Directory Traversal Vulnerability
A vulnerability in the REST API of Cisco UCS Director and UCS Director Express for Big Data could allow an authenticated, remote attacker to conduct directory traversal attacks on an affected device.
The vulnerability is due to insufficient validation of user-supplied input to the REST API of the affected software. An attacker could exploit this vulnerability by sending a crafted request to the REST API. A successful exploit could allow the attacker to perform a Denial of Service (DoS) attack on the affected device.
Bug ID(s): CSCvs56401, CSCvt39526
CVE ID: CVE-2020-3249
Security Impact Rating (SIR): High
CVSS Base Score: 8.1
CVSS Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:HCisco UCS Director and UCS Director Express for Big Data Directory Traversal Vulnerability
A vulnerability in the REST API of Cisco UCS Director and UCS Director Express for Big Data could allow an authenticated, remote attacker to conduct directory traversal attacks on an affected device.
The vulnerability is due to insufficient validation of user-supplied input to the REST API of the affected software. An attacker could exploit this vulnerability by sending a crafted request to the REST API. A successful exploit could allow the attacker to execute code with root privileges.
Bug ID(s): CSCvs56400, CSCvt39535
CVE ID: CVE-2020-3248
Security Impact Rating (SIR): High
CVSS Base Score: 8.1
CVSS Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:HCisco UCS Director and UCS Director Express for Big Data Directory Traversal Vulnerability
A vulnerability in the REST API of Cisco UCS Director and UCS Director Express for Big Data could allow an authenticated, remote attacker to conduct directory traversal attacks on an affected device.
The vulnerability is due to insufficient validation of user-supplied input to the REST API of the affected software. An attacker could exploit this vulnerability by sending a malicious file to the REST API. A successful exploit could allow the attacker to write or execute arbitrary files on the system.
Bug ID(s): CSCvs53502, CSCvt39565
CVE ID: CVE-2020-3247
Security Impact Rating (SIR): High
CVSS Base Score: 8.1
CVSS Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:HCisco UCS Director and UCS Director Express for Big Data Directory Traversal Vulnerability
A vulnerability in the REST API of Cisco UCS Director and UCS Director Express for Big Data could allow an authenticated, remote attacker to conduct directory traversal attacks on an affected device.
The vulnerability is due to insufficient validation of user-supplied input to the REST API of the affected software. An attacker could exploit this vulnerability by sending a malicious zip file to the REST API. A successful exploit could allow the attacker to write or execute arbitrary files on the system with full administrative privileges.
Bug ID(s): CSCvs53500, CSCvt39561
CVE ID: CVE-2020-3239
Security Impact Rating (SIR): High
CVSS Base Score: 8.1
CVSS Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:HCisco UCS Director Directory Traversal Vulnerability
A vulnerability in the REST API endpoint of Cisco UCS Director could allow an authenticated, remote attacker to conduct directory traversal attacks on an affected device.
The vulnerability is due to insufficient validation of user-supplied input to the REST API of the affected software. An attacker could exploit this vulnerability by sending a crafted request to the REST API. A successful exploit could allow the attacker to read arbitrary files on the system.
Bug ID(s): CSCvs69022
CVE ID: CVE-2020-3252
Security Impact Rating (SIR): Medium
CVSS Base Score: 6.5
CVSS Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
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There are no workarounds that address these vulnerabilities.
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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 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.
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.
Fixed Releases
Cisco fixed this vulnerability in UCS Director Release 6.7.4.0 and UCS Director Express for Big Data Release 3.7.4.0.
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The Cisco Product Security Incident Response Team (PSIRT) is aware that proof-of-concept exploit code is available for the vulnerabilities that are described in this advisory.
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Cisco would like to thank Steven Seeley (mr_me) of Source Incite working with Trend Micro Zero Day Initiative for reporting the following vulnerabilities:
- CVE-2020-3243
- CVE-2020-3240
- CVE-2020-3250
- CVE-2020-3239
- CVE-2020-3247
- CVE-2020-3248
- CVE-2020-3249
Cisco would like to thank Steven Seeley (mr_me) of Source Incite for reporting the following vulnerabilities:
- CVE-2020-3251
- CVE-2020-3252
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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.
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Show LessVersion Description Section Status Date 1.1 Updated information about the availability of exploit code. Exploitation and Public Announcements Final 2020-APR-17 1.0 Initial public release. — Final 2020-APR-15
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