Advisory Details

November 19th, 2021

Ivanti Avalanche EnterpriseServer Service Exposed Dangerous Function Authentication Bypass Vulnerability

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:H/I:N/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
  • 2022-05-26 - Advisory Updated
CREDIT Piotr Bazydlo (@chudypb)
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