Ivanti Avalanche JNLP File Improper Access Control Authentication Bypass Vulnerability

November 18th, 2021
ZDI-21-1298 ZDI-CAN-14123

CVE ID

CVE-2021-42124

CVSS Score

8.1 AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors

Ivanti

Affected Products

Avalanche

Vulnerability Details

This vulnerability allows remote attackers to bypass authentication on affected installations of Ivanti Avalanche. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the handling of JNLP files. The issue results from improper access control. An attacker can leverage this vulnerability to bypass authentication on the system.

Additional Details

Fixed in version 6.3.3.


Disclosure Timeline

  • 2021-06-30 - Vulnerability reported to vendor
  • 2021-11-18 - Coordinated public release of advisory
  • 2022-05-26 - Advisory Updated

Credit

Piotr Bazydlo (@chudypb)

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