Claws Mail: Improper STARTTLS handling — GLSA 202007-56

A vulnerability was discovered in Claws Mail's STARTTLS handling, possibly allowing an integrity/confidentiality compromise.

Package	mail-client/claws-mail on all architectures
Affected versions	< 3.17.6
Unaffected versions	>= 3.17.6

Claws Mail is a GTK based e-mail client.

It was discovered that Claws Mail was not properly handling state within the STARTTLS protocol handshake.

There may be a breach of integrity or confidentiality in connections made using Claws Mail with STARTTLS.

There is no known workaround at this time.

All Claws Mail users should upgrade to the latest version:

 # emerge --sync
 # emerge --ask --oneshot --verbose ">=mail-client/claws-mail-3.17.6"

Release date
July 28, 2020

Latest revision
July 28, 2020: 1

Severity
normal

Exploitable
remote

Bugzilla entries