CVE-2017-17688

** DISPUTED ** The OpenPGP specification allows a Cipher Feedback Mode (CFB) malleability-gadget attack that can indirectly lead to plaintext exfiltration, aka EFAIL. NOTE: third parties report that this is a problem in applications that mishandle the Modification Detection Code (MDC) feature or accept an obsolete packet type, not a problem in the OpenPGP specification.

This update for enigmail to version 2.0.4 fixes multiple issues.

Security issues fixed:

• CVE-2017-17688: CFB gadget attacks allowed to exfiltrate plaintext out of encrypted emails. enigmail now fails on GnuPG integrity check warnings for old Algorithms (bsc#1093151)
• CVE-2017-17689: CBC gadget attacks allows to exfiltrate plaintext out of encrypted emails (bsc#1093152)

This update also includes new and updated functionality:

• The Encryption and Signing buttons now work for both OpenPGP and S/MIME. Enigmail will chose between S/MIME or OpenPGP depending on whether the keys for all recipients are available for the respective standard
• Support for the Autocrypt standard, which is now enabled by default
• Support for Pretty Easy Privacy (p≡p)
• Support for Web Key Directory (WKD)
• The message subject can now be encrypted and replaced with a dummy subject, following the Memory Hole standard forprotected Email Headers
• keys on keyring are automatically refreshed from keyservers at irregular intervals
• Subsequent updates of Enigmail no longer require a restart of Thunderbird
• Keys are internally addressed using the fingerprint instead of the key ID

This update for enigmail to version 2.0.4 fixes multiple issues.

Security issues fixed:

• CVE-2017-17688: CFB gadget attacks allowed to exfiltrate plaintext out of encrypted emails. enigmail now fails on GnuPG integrity check warnings for old Algorithms (bsc#1093151)
• CVE-2017-17689: CBC gadget attacks allows to exfiltrate plaintext out of encrypted emails (bsc#1093152)

This update also includes new and updated functionality:

• The Encryption and Signing buttons now work for both OpenPGP and S/MIME. Enigmail will chose between S/MIME or OpenPGP depending on whether the keys for all recipients are available for the respective standard
• Support for the Autocrypt standard, which is now enabled by default
• Support for Pretty Easy Privacy (p≡p)
• Support for Web Key Directory (WKD)
• The message subject can now be encrypted and replaced with a dummy subject, following the Memory Hole standard forprotected Email Headers
• keys on keyring are automatically refreshed from keyservers at irregular intervals
• Subsequent updates of Enigmail no longer require a restart of Thunderbird
• Keys are internally addressed using the fingerprint instead of the key ID

These are all security issues fixed in the enigmail-2.2.4-1.4 package on the GA media of openSUSE Tumbleweed.