Ivanti Avalanche MapShare Service Command Injection Remote Code Execution Vulnerability

November 19th, 2021
ZDI-21-1325 ZDI-CAN-15168

CVE ID

CVE-2021-42129

CVSS Score

9.8 AV:N/AC:L/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 execute arbitrary code on affected installations of Ivanti Avalanche. Although authentication is required to exploit this vulnerability, the existing authentication mechanism can be bypassed.

The specific flaw exists within the mapShare method. The issue results from the lack of proper validation of a user-supplied string before using it to execute a system call. An attacker can leverage this vulnerability to execute code in the context of the service account.

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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