Advisory Details

August 15th, 2023

Ivanti Avalanche SecureFilter allowPassThrough Authentication Bypass Vulnerability

ZDI-23-1121
ZDI-CAN-21005

CVE ID CVE-2023-32566
CVSS SCORE 7.3, AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
AFFECTED VENDORS Ivanti
AFFECTED PRODUCTS Avalanche
VULNERABILITY DETAILS

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

The specific flaw exists within the allowPassThrough method. The issue results from incorrect string matching when making an authorization decision. An attacker can leverage this vulnerability to partially bypass authentication on the system.

ADDITIONAL DETAILS Ivanti has issued an update to correct this vulnerability. More details can be found at:
https://forums.ivanti.com/s/article/New-Avalanche-Landing-Page?language=en_US
DISCLOSURE TIMELINE
  • 2023-05-30 - Vulnerability reported to vendor
  • 2023-08-15 - Coordinated public release of advisory
CREDIT 06fe5fd2bc53027c4a3b7e395af0b850e7b8a044
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