Bug 1172506 (CVE-2020-13777)

Summary:	VUL-0: CVE-2020-13777: gnutls: session resumption works without master key allowing MITM
Product:	[Novell Products] SUSE Security Incidents	Reporter:	Wolfgang Frisch <wolfgang.frisch>
Component:	Incidents	Assignee:	Security Team bot <security-team>
Status:	RESOLVED FIXED	QA Contact:	Security Team bot <security-team>
Severity:	Critical
Priority:	P1 - Urgent	CC:	aherzig, atoptsoglou, jsegitz, meissner, smash_bz, vcizek
Version:	unspecified
Target Milestone:	---
Hardware:	Other
OS:	Other
URL:	https://smash.suse.de/issue/260689/
Whiteboard:	CVSSv3.1:SUSE:CVE-2020-13777:7.4:(AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N)
Found By:	Security Response Team	Services Priority:
Business Priority:		Blocker:	---
Marketing QA Status:	---	IT Deployment:	---

Description Wolfgang Frisch 2020-06-04 09:18:42 UTC

CVE-2020-13777

GnuTLS servers are able to use tickets issued by each other without access to the secret key as generated by gnutls_session_ticket_key_generate(). In TLS 1.3 this allows a MITM server without valid credentials to resume sessions with a client that first established an initial connection with a server with valid credentials. In TLS 1.2, it may allow attackers to recover the previous conversations.

References:
https://gitlab.com/gnutls/gnutls/-/issues/1011
https://bugzilla.redhat.com/show_bug.cgi?id=1843723
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-13777

Comment 4 Vítězslav Čížek 2020-06-09 07:55:31 UTC

Fixed packages have been submitted.

Comment 6 Swamp Workflow Management 2020-06-09 22:13:42 UTC

SUSE-SU-2020:1584-1: An update that solves one vulnerability and has one errata is now available.

Category: security (important)
Bug References: 1172461,1172506
CVE References: CVE-2020-13777
Sources used:
SUSE Linux Enterprise Server for SAP 15 (src):    gnutls-3.6.7-6.29.1
SUSE Linux Enterprise Server 15-LTSS (src):    gnutls-3.6.7-6.29.1
SUSE Linux Enterprise Module for Basesystem 15-SP2 (src):    gnutls-3.6.7-6.29.1
SUSE Linux Enterprise Module for Basesystem 15-SP1 (src):    gnutls-3.6.7-6.29.1
SUSE Linux Enterprise High Performance Computing 15-LTSS (src):    gnutls-3.6.7-6.29.1
SUSE Linux Enterprise High Performance Computing 15-ESPOS (src):    gnutls-3.6.7-6.29.1

NOTE: This line indicates an update has been released for the listed product(s). At times this might be only a partial fix. If you have questions please reach out to maintenance coordination.

Comment 7 Swamp Workflow Management 2020-06-10 20:46:15 UTC

openSUSE-SU-2020:0790-1: An update that solves one vulnerability and has one errata is now available.

Category: security (important)
Bug References: 1172461,1172506
CVE References: CVE-2020-13777
Sources used:
openSUSE Leap 15.1 (src):    gnutls-3.6.7-lp151.2.18.1

Comment 8 Alexandros Toptsoglou 2020-06-30 07:30:23 UTC

Done