16 May 2019
Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2019.1758 Cisco Identity Services Engine Arbitrary Client Certificate Creation Vulnerability 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 Resolution: Patch/Upgrade CVE Names: CVE-2019-1851 Original Bulletin: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190515-ise-certcreation - --------------------------BEGIN INCLUDED TEXT-------------------- Cisco Identity Services Engine Arbitrary Client Certificate Creation Vulnerability Priority: Medium 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 CVE-2019-1851 CWE-285 CVSS Score: 6.8 AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:H/A:N/E:X/RL:X/RC:X Summary o 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: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/ cisco-sa-20190515-ise-certcreation Affected Products 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. Details o Only Cisco ISE deployments with the ERS API enabled are affected. The ERS API is disabled by default. Workarounds o There are no workarounds that address this vulnerability. Fixed Software 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 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 the resolution of a Cisco TAC support case. 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. URL o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/ cisco-sa-20190515-ise-certcreation Revision History o +----------+---------------------------+----------+--------+--------------+ | Version | Description | Section | Status | Date | +----------+---------------------------+----------+--------+--------------+ | 1.0 | Initial public release. | - | Final | 2019-May-15 | +----------+---------------------------+----------+--------+--------------+ - --------------------------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 firstname.lastname@example.org 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: email@example.com 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 iQIVAwUBXNz/smaOgq3Tt24GAQgjbQ//T5cGyq9n5rTeF/3AcN45vCrDfqLCCLh2 dsfe2VX1vABQFU6Ux0iwND6KhOqEq87VQagIsot1lynXUMG3FCxJ7ABveD682xOR pOVA/MIvVYvgv0NYpJmwzbBpLEwNYMK/HhHs7KwkxlDWgGav90PC513zo3Yg3gBQ FhgVVPvllpbkyCaBFHKbfnvCZlKjxGWRvEgB7CLmKHIaSGinK5I49fOdNzMQaXv6 n1wAHO46eTjdX+qCzlda2f1zpT2fBfn/EI54XR2/RK2BLFr/i1/xrsmv7V3a5el/ RSv7wwk/TaNST3vnEa/FRUJHPLxrReelfu0jmAf6Lkt7LWL5uiJ2nHlD+L55vfBO Uz2Oysq74BHeGjvViKctPujWZfXWI/0yzM7/zXKEO/Bi43Rc+QYQuc2MzCW8GRNT c5XczR0K9pIKR6GnxKFFXLT+xVtAvB1tyATnKcs3fHm/bef39H1QuOX79Sl1w4st bQo0fhoBGOEBd6YvYC5CCJKXCTrk+FN/ypnGvWfwGyJz5QRYkDMeNUIuMVXVBw13 remm1hgbM9XjkFYC+2WGfB+A3o1w8atax6fHiarfv8xa133dU+MOc6comAeEd2A4 VAFgFeGZ067Yq2NczxskiJhJjc1SjrYktEztazIyuAaP4PvDolu7kSSAkriqud3y Vz+2ftcKXbA= =T8pY -----END PGP SIGNATURE-----