CVE-2017-17689 Information

Description

The S/MIME specification allows a Cipher Block Chaining (CBC) malleability-gadget attack that can indirectly lead to plaintext exfiltration aka EFAIL.

CVSS Vector

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Reference

http://www.securityfocus.com/bid/104165 https://efail.de https://news.ycombinator.com/item?id=17066419 https://pastebin.com/gNCc8aYm https://twitter.com/matthew_d_green/status/996371541591019520 https://www.synology.com/support/security/Synology_SA_18_22

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

NONE

Base Score

NONE

Base Severity

5.9