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Vulnerability of Siemens SIMATIC: privilege escalation via SIMATIC Logon

Synthesis of the vulnerability 

An attacker can bypass the authentication to the Logon module of Siemens SIMATIC, in order to escalate his privileges.
Vulnerable products: SIMATIC.
Severity of this weakness: 3/4.
Creation date: 14/02/2017.
Références of this bulletin: CERTFR-2017-AVI-049, CVE-2017-2684, SSA-931064, VIGILANCE-VUL-21828.

Description of the vulnerability 

The Siemens SIMATIC product includes a component for centralized user management.

However, one can bypass the user authentication knowing only a valid username.

An attacker can therefore bypass the authentication to the Logon module of Siemens SIMATIC, in order to escalate his privileges.
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This vulnerability bulletin impacts software or systems such as SIMATIC.

Our Vigil@nce team determined that the severity of this security note is important.

The trust level is of type confirmed by the editor, with an origin of intranet client.

An attacker with a expert ability can exploit this cybersecurity note.

Solutions for this threat 

Siemens SIMATIC Logon: version 1.5 SP3 Update 2.
The version 1.5 SP3 Update 2 is fixed.
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