Auth bypass in Siemens Simatic Hmi Panels
CVE-2011-4508
The HMI web server in Siemens WinCC flexible 2004, 2005, 2007, and 2008 before SP3; WinCC V11 (aka TIA portal) before SP2 Update 1; the TP, OP, MP, Comfort Panels, and Mobile Panels SIMATIC HMI panels; WinCC V11 Runtime Advanced; and WinCC flexible Runtime generates predictable authentication tokens for cookies, which makes it easier for remote attackers to bypass authentication via a crafted cookie.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v2 metric
CVSS v2 base score 9.3 (High). Vector: AV:N/AC:M/Au:N/C:C/I:C/A:C. This CVE predates CVSS v3 and has no v3 score from NVD.
EPSS exploit prediction
EPSS: 0.030 (86.8th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 87th percentile — 86.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.031 · newest: 0.030 · change: -0.001
Affected products
- Siemens Simatic Hmi Panels — versions comfort_panels, mobile_panels, mp
- Siemens Wincc — versions v11
- Siemens Wincc Flexible — versions 2004, 2005, 2007
- Siemens Wincc Flexible Runtime
- Siemens Wincc Runtime Advanced — versions v11
Weakness classification (CWE)
References
- www.siemens.com/corporate-technology/pool/de/forschungsfelder/siemens_security_… (Vendor Advisory)
- www.us-cert.gov/control_systems/pdf/ICSA-12-030-01.pdf (US Government Resource)