Vulnerability CVE-2017-0897
Published: 2017-06-22

Description:
ExpressionEngine version 2.x < 2.11.8 and version 3.x < 3.5.5 create an object signing token with weak entropy. Successfully guessing the token can lead to remote code execution.

Type:

CWE-331

 (Insufficient Entropy)

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
Expressionengine -> Expressionengine 

 References:
http://www.securityfocus.com/bid/99242
https://docs.expressionengine.com/latest/about/changelog.html#version-3-5-5
https://docs.expressionengine.com/v2/about/changelog.html#version-2-11-8
https://expressionengine.com/blog/expressionengine-3.5.5-and-2.11.8-released
https://hackerone.com/reports/215890
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