Gentoo Websites Logo
Go to: Gentoo Home Documentation Forums Lists Bugs Planet Store Wiki Get Gentoo!

Bug 733684 (CVE-2020-15917)

Summary: <mail-client/claws-mail-3.17.6: Improper STARTTLS handling (CVE-2020-15917)
Product: Gentoo Security Reporter: Sam James <sam>
Component: VulnerabilitiesAssignee: Gentoo Security <security>
Severity: normal CC: polynomial-c
Priority: Normal Flags: nattka: sanity-check+
Version: unspecified   
Hardware: All   
OS: Linux   
See Also:
Whiteboard: B3 [glsa+ cleanup cve]
Package list:
Runtime testing required: ---

Description Sam James archtester gentoo-dev Security 2020-07-23 19:47:18 UTC
"common/session.c in Claws Mail before 3.17.6 has a protocol violation because suffix data after STARTTLS is mishandled."

The main issue here (similar to other recent problems in mail clients) is that an attacker could inject commands even after the client believes TLS is being used.
Comment 1 Sam James archtester gentoo-dev Security 2020-07-23 19:49:02 UTC
Ready to stable?
Comment 2 Agostino Sarubbo gentoo-dev 2020-07-24 15:10:24 UTC
amd64 stable
Comment 3 Sam James archtester gentoo-dev Security 2020-07-27 14:22:19 UTC
x86 stable. Please cleanup.
Comment 4 Sam James archtester gentoo-dev Security 2020-07-27 16:52:04 UTC
GLSA vote: yes
Comment 5 Larry the Git Cow gentoo-dev 2020-07-27 17:13:23 UTC
The bug has been referenced in the following commit(s):

commit 7c80d0119b53394265b092f29823dd63cc9dd440
Author:     Lars Wendler <>
AuthorDate: 2020-07-27 17:13:15 +0000
Commit:     Lars Wendler <>
CommitDate: 2020-07-27 17:13:15 +0000

    mail-client/claws-mail: Security cleanup
    Package-Manager: Portage-3.0.1, Repoman-2.3.23
    Signed-off-by: Lars Wendler <>

 mail-client/claws-mail/Manifest                    |   1 -
 mail-client/claws-mail/claws-mail-3.17.5-r1.ebuild | 224 ---------------------
 2 files changed, 225 deletions(-)
Comment 6 GLSAMaker/CVETool Bot gentoo-dev 2020-07-28 19:42:52 UTC
This issue was resolved and addressed in
 GLSA 202007-56 at
by GLSA coordinator Sam James (sam_c).