critical
9.3
CWE
78 266 20 77
Advisory Published
Updated

CVE-2021-1594: Cisco Identity Services Engine Privilege Escalation Vulnerability

First published: Wed Oct 06 2021(Updated: )

A vulnerability in the REST API of Cisco Identity Services Engine (ISE) could allow an unauthenticated, remote attacker to perform a command injection attack and elevate privileges to root. This vulnerability is due to insufficient input validation for specific API endpoints. An attacker in a man-in-the-middle position could exploit this vulnerability by intercepting and modifying specific internode communications from one ISE persona to another ISE persona. A successful exploit could allow the attacker to run arbitrary commands with root privileges on the underlying operating system. To exploit this vulnerability, the attacker would need to decrypt HTTPS traffic between two ISE personas that are located on separate nodes.

Credit: ykramarz@cisco.com

Affected SoftwareAffected VersionHow to fix
Cisco Identity Services Engine>=2.4.0<2.6.0
Cisco Identity Services Engine=2.4\(0.902\)
Cisco Identity Services Engine=2.6\(0.156\)
Cisco Identity Services Engine=2.6.0
Cisco Identity Services Engine=2.6.0-patch1
Cisco Identity Services Engine=2.6.0-patch2
Cisco Identity Services Engine=2.6.0-patch3
Cisco Identity Services Engine=2.6.0-patch5
Cisco Identity Services Engine=2.6.0-patch6
Cisco Identity Services Engine=2.6.0-patch7
Cisco Identity Services Engine=2.6.0-patch8
Cisco Identity Services Engine=2.6.0-patch9
Cisco Identity Services Engine=2.7\(0.903\)
Cisco Identity Services Engine=2.7.0
Cisco Identity Services Engine=2.7.0-patch1
Cisco Identity Services Engine=2.7.0-patch2
Cisco Identity Services Engine=2.7.0-patch3
Cisco Identity Services Engine=2.7.0-patch4
Cisco Identity Services Engine=3.0\(0.458\)
Cisco Identity Services Engine=3.0.0
Cisco Identity Services Engine=3.0.0-patch1
Cisco Identity Services Engine=3.0.0-patch2
Cisco Identity Services Engine=3.0.0-patch3
Cisco Identity Services Engine=3.1\(0.440\)

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Reference Links

Frequently Asked Questions

  • What is CVE-2021-1594?

    CVE-2021-1594 is a vulnerability in the REST API of Cisco Identity Services Engine (ISE) that allows an unauthenticated attacker to perform a command injection attack and elevate privileges to root.

  • What is the severity of CVE-2021-1594?

    CVE-2021-1594 has a severity rating of 8.1 out of 10, indicating a critical vulnerability.

  • Which software versions are affected by CVE-2021-1594?

    Cisco Identity Services Engine versions between 2.4.0 and 2.6.0 are affected by CVE-2021-1594.

  • How can an attacker exploit CVE-2021-1594?

    An attacker can exploit CVE-2021-1594 by sending specially crafted requests to specific API endpoints of the Cisco Identity Services Engine's REST API.

  • Is there a fix available for CVE-2021-1594?

    Yes, Cisco has released security patches to address the vulnerability. It is recommended to update to a patched version of Cisco Identity Services Engine.

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