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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Cendio | ThinLinc | 4.1.0 – < 4.15.1, 4.16.0 – < 4.16.1, 4.17.0 – < 4.17.1, 4.18.0 – < 4.18.1, 4.19.0 – < 4.19.1, 4.20.0 – < 4.20.1 | 4.15.1 |
References
- ThinLinc 4.15.1 through 4.20.1 security release release-notes patch
- Urgent: ThinLinc security issue vendor-advisory
- VulnCheck Advisory: Cendio ThinLinc Improper Authentication via Web Access third-party-advisory