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Advisories

Cendio ThinLinc Improper Authentication via Web Access

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Severity
high
Date
Affecting

  • ThinLinc >= 4.1.0, < 4.15.1

  • ThinLinc >= 4.16.0, < 4.16.1

  • ThinLinc >= 4.17.0, < 4.17.1

  • ThinLinc >= 4.18.0, < 4.18.1

  • ThinLinc >= 4.19.0, < 4.19.1

  • ThinLinc >= 4.20.0, < 4.20.1

CWE
  • CWE-290 Authentication Bypass by Spoofing
CVSS
7.7
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Credit
Cosmikal S.L.
Description
Cendio ThinLinc contains an improper authentication vulnerability in its browser-based web client (tlwebaccess) that allows an authenticated attacker to impersonate any other user, including root, by exploiting flaws in multi-step authentication flows such as one-time passwords, login banners, or expired password prompts. Attackers can leverage this authentication bypass during the multi-step login process to gain unauthorized access to other user accounts, including administrative privileges, in versions from 4.1.0 through 4.20.0.

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