CVE-2017-17689 Information disclosure in n/a
Attackers can exploit CBC malleability in S/MIME to exfiltrate plaintext from encrypted emails, affecting email clients and libraries.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2017-17689?
CVE-2017-17689 is a medium-severity vulnerability in Microsoft Outlook, published on 16 May 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The S/MIME specification allows a Cipher Block Chaining (CBC) malleability-gadget attack that can indirectly lead to plaintext exfiltration, aka EFAIL.
Which versions are affected by CVE-2017-17689?
It affects 17 products.
Products include 9folders Nine, Apple Mail, Bloop Airmail, Emclient Emclient, Flipdogsolutions Maildroid, Freron Mailmate and 11 more.
How do I fix CVE-2017-17689?
Apply the vendor's patch.
Is CVE-2017-17689 being exploited?
There is no known exploitation of CVE-2017-17689 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Outlook
Sources
Also known as DEBIAN-CVE-2017-17689, GHSA-xv45-9768-g2mm, UBUNTU-CVE-2017-17689.