Vulnerability CVE-2016-9154
Published: 2016-12-23

Description:
Siemens Desigo PX Web modules PXA40-W0, PXA40-W1, PXA40-W2 for Desigo PX automation controllers PXC00-E.D, PXC50-E.D, PXC100-E.D, PXC200-E.D (All firmware versions < V6.00.046) and Desigo PX Web modules PXA30-W0, PXA30-W1, PXA30-W2 for Desigo PX automation controllers PXC00-U, PXC64-U, PXC128-U (All firmware versions < V6.00.046) use a pseudo random number generator with insufficient entropy to generate certificates for HTTPS, potentially allowing remote attackers to reconstruct the corresponding private key.

Type:

CWE-332

 (Insufficient Entropy in PRNG)

CVSS2 => (AV:N/AC:L/Au:N/C:P/I:N/A:N)

CVSS Base Score
Impact Subscore
Exploitability Subscore
5/10
2.9/10
10/10
Exploit range
Attack complexity
Authentication
Remote
Low
No required
Confidentiality impact
Integrity impact
Availability impact
Partial
None
None
Affected software
Siemens -> Desigo web module pxa40-w0 firmware 
Siemens -> Desigo web module pxa40-w2 firmware 
Siemens -> Desigo web module pxa30-w2 firmware 
Siemens -> Desigo web module pxa30-w0 firmware 
Siemens -> Desigo web module pxa30-w1 firmware 
Siemens -> Desigo web module pxa40-w1 firmware 

 References:
http://www.securityfocus.com/bid/94962
http://www.siemens.com/cert/pool/cert/siemens_security_advisory_ssa-856492.pdf
https://ics-cert.us-cert.gov/advisories/ICSA-16-355-01
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