Ivanti Avalanche EnterpriseServer Service Exposed Dangerous Function Authentication Bypass Vulnerability

November 19th, 2021
ZDI-21-1324 ZDI-CAN-15137

CVE ID

CVE-2021-42128

CVSS Score

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

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 SetUser class. The issue results from the lack of authentication prior to allowing access to functionality. An attacker can leverage this vulnerability to bypass authentication on the system.

Additional Details

Fixed in version Avalanche 6.3.3


Disclosure Timeline

  • 2021-09-22 - Vulnerability reported to vendor
  • 2021-11-19 - Coordinated public release of advisory
  • 2024-02-16 - Advisory Updated

Credit

Piotr Bazydlo (@chudypb)

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