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AUSCERT External Security Bulletin Redistribution
Cisco Identity Services Engine Arbitrary Client Certificate
16 May 2019
AusCERT Security Bulletin Summary
Product: Cisco Identity Services Engine
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Provide Misleading Information -- Existing Account
Unauthorised Access -- Existing Account
CVE Names: CVE-2019-1851
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Cisco Identity Services Engine Arbitrary Client Certificate Creation
Advisory ID: cisco-sa-20190515-ise-certcreation
First Published: 2019 May 15 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds availableCisco Bug IDs: CSCvm81230
A vulnerability in the External RESTful Services (ERS) API of the Cisco
Identity Services Engine (ISE) could allow an authenticated, remote
attacker to generate arbitrary certificates signed by the Internal
Certificate Authority (CA) Services on ISE.
This vulnerability is due to an incorrect implementation of role-based
access control (RBAC). An attacker could exploit this vulnerability by
crafting a specific HTTP request with administrative credentials. A
successful exploit could allow the attacker to generate a certificate that
is signed and trusted by the ISE CA with arbitrary attributes. The attacker
could use this certificate to access other networks or assets that are
protected by certificate authentication.
There are no workarounds that address this vulnerability.
This advisory is available at the following link:
o Vulnerable Products
This vulnerability affects Cisco ISE deployments with the ERS API enabled.
For information about affected software releases, consult the Cisco bug IDs
at the top of this advisory.
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory
are known to be affected by this vulnerability.
o Only Cisco ISE deployments with the ERS API enabled are affected. The ERS
API is disabled by default.
o There are no workarounds that address this vulnerability.
o For information about fixed software releases , consult the Cisco bug ID(s)
at the top of this advisory.
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
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.
o This vulnerability was found during the resolution of a Cisco TAC support
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.
| Version | Description | Section | Status | Date |
| 1.0 | Initial public release. | - | Final | 2019-May-15 |
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