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7.4
HIGH CVSS 3.1
CVE-2020-13777
GnuTLS Session Ticket Vulnerability
Description

GnuTLS 3.6.x before 3.6.14 uses incorrect cryptography for encrypting a session ticket (a loss of confidentiality in TLS 1.2, and an authentication bypass in TLS 1.3). The earliest affected version is 3.6.4 (2018-09-24) because of an error in a 2018-09-18 commit. Until the first key rotation, the TLS server always uses wrong data in place of an encryption key derived from an application.

INFO

Published Date :

June 4, 2020, 7:15 a.m.

Last Modified :

Nov. 21, 2024, 5:01 a.m.

Remotely Exploit :

Yes !

Source :

[email protected]
Affected Products

The following products are affected by CVE-2020-13777 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Canonical ubuntu_linux
1 Fedoraproject fedora
1 Debian debian_linux
1 Gnu gnutls
: Total Affected Vendor : 4 | Products : 4
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 2.0 MEDIUM [email protected]
CVSS 3.1 HIGH [email protected]
Solution
A vulnerability in GnuTLS allows session ticket encryption issues, potentially leading to a loss of confidentiality or authentication bypass.
  • Update the affected GnuTLS packages.
  • Follow vendor-specific guidance to apply the update.
Public PoC/Exploit Available at Github

CVE-2020-13777 has a 15 public PoC/Exploit available at Github. Go to the Public Exploits tab to see the list.

References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2020-13777.

URL Resource
http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00015.html Broken Link
https://gnutls.org/security-new.html#GNUTLS-SA-2020-06-03 Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6C4DHUKV6M6SJ5CV6KVHZNHNF7HCUE5P/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6RTXZOXC4MHTFE2HKY6IAZMF2WHD2WMV/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RRQBFK3UZ7SV76IYDTS4PS6ABS2DSJHK/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VMB3UGI5H5RCFRU6OGRPMNUCNLJGEN7Y/
https://security.gentoo.org/glsa/202006-01 Third Party Advisory
https://security.netapp.com/advisory/ntap-20200619-0004/ Third Party Advisory
https://usn.ubuntu.com/4384-1/ Third Party Advisory
https://www.debian.org/security/2020/dsa-4697 Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00015.html Broken Link
https://gnutls.org/security-new.html#GNUTLS-SA-2020-06-03 Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6C4DHUKV6M6SJ5CV6KVHZNHNF7HCUE5P/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6RTXZOXC4MHTFE2HKY6IAZMF2WHD2WMV/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RRQBFK3UZ7SV76IYDTS4PS6ABS2DSJHK/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VMB3UGI5H5RCFRU6OGRPMNUCNLJGEN7Y/
https://security.gentoo.org/glsa/202006-01 Third Party Advisory
https://security.netapp.com/advisory/ntap-20200619-0004/ Third Party Advisory
https://usn.ubuntu.com/4384-1/ Third Party Advisory
https://www.debian.org/security/2020/dsa-4697 Third Party Advisory
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2020-13777 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2020-13777 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Profile Photo
DipeshGarg/Shell-Scripts

Some of my personal automation shell scripts.

Shell

Updated: 6 months ago
0 stars 0 fork 0 watcher
Born at : Sept. 14, 2022, 6:50 a.m. This repo has been linked 3 different CVEs too.
Profile Photo
kerk1/WarfareCenter-CSI-SIEM

None

Dockerfile Shell CSS HTML PHP Python JavaScript Vim Script Zeek PureBasic

Updated: 2 years, 11 months ago
0 stars 0 fork 0 watcher
Born at : Sept. 14, 2022, 6:21 a.m. This repo has been linked 2 different CVEs too.
Profile Photo
soosmile/POC

None

Updated: 4 months, 3 weeks ago
9 stars 1 fork 1 watcher
Born at : June 21, 2022, 7:45 a.m. This repo has been linked 944 different CVEs too.
Profile Photo
mvlnetdev/zeek_detection_script_collection

A collection of zeek detection scripts

Updated: 1 month, 1 week ago
2 stars 0 fork 0 watcher
Born at : July 13, 2021, 8:38 a.m. This repo has been linked 4 different CVEs too.
Profile Photo
mmguero-dev/Malcolm-PCAP

This repository has been archived in favor of https://github.com/idaholab/Malcolm-Test-Artifacts

pcap pcap-files pcaps

Python

Updated: 1 month, 1 week ago
37 stars 5 fork 5 watcher
Born at : April 2, 2021, 1:20 p.m. This repo has been linked 7 different CVEs too.
Profile Photo
developer3000S/PoC-in-GitHub

None

Updated: 2 months ago
37 stars 4 fork 4 watcher
Born at : March 12, 2021, 12:22 p.m. This repo has been linked 1063 different CVEs too.
Profile Photo
alphaSeclab/sec-daily-2020

2020年发布到阿尔法实验室微信公众号的所有安全资讯汇总

Updated: 3 months, 3 weeks ago
41 stars 15 fork 15 watcher
Born at : Jan. 11, 2021, 2:08 a.m. This repo has been linked 190 different CVEs too.
Profile Photo
hectorgie/PoC-in-GitHub

None

Updated: 4 months, 4 weeks ago
18 stars 10 fork 10 watcher
Born at : Jan. 2, 2021, 10:19 p.m. This repo has been linked 1053 different CVEs too.
Profile Photo
0xT11/CVE-POC

None

Updated: 2 months ago
84 stars 31 fork 31 watcher
Born at : Oct. 2, 2020, 2:49 p.m. This repo has been linked 1114 different CVEs too.
Profile Photo
garethr/snykout

A command line tool which provides an alternative interface to snyk test

snyk

Makefile Dockerfile Crystal Open Policy Agent

Updated: 3 years, 6 months ago
4 stars 4 fork 4 watcher
Born at : Aug. 31, 2020, 8:31 a.m. This repo has been linked 82 different CVEs too.
Profile Photo
not1337/tlsserver

A simple to use TLS server library for Linux

Makefile C

Updated: 5 years ago
0 stars 0 fork 0 watcher
Born at : Aug. 18, 2020, 2:44 p.m. This repo has been linked 1 different CVEs too.
Profile Photo
Information-Warfare-Center/CSI-SIEM

CSI SIEM

Dockerfile Shell CSS HTML PHP Python JavaScript Vim Script Zeek PureBasic

Updated: 4 months, 1 week ago
110 stars 37 fork 37 watcher
Born at : June 28, 2020, 8:52 p.m. This repo has been linked 2 different CVEs too.
Profile Photo
prprhyt/PoC_TLS1_3_CVE-2020-13777

None

Python

Updated: 3 years, 8 months ago
0 stars 0 fork 0 watcher
Born at : June 21, 2020, 11:55 a.m. This repo has been linked 1 different CVEs too.
Profile Photo
shigeki/challenge_CVE-2020-13777

Challange CVE-2020-13777

Updated: 5 years, 2 months ago
2 stars 0 fork 0 watcher
Born at : June 12, 2020, 12:54 p.m. This repo has been linked 1 different CVEs too.
Profile Photo
0xxon/cve-2020-13777

Zeek script to detect servers vulnerable to CVE-2020-13777

Zeek Makefile Shell

Updated: 1 year, 1 month ago
4 stars 0 fork 0 watcher
Born at : June 9, 2020, 1:11 a.m. This repo has been linked 1 different CVEs too.

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2020-13777 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2020-13777 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by af854a3a-2127-422b-91ae-364da2661108

    Nov. 21, 2024

    Action Type Old Value New Value
    Added Reference http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00015.html
    Added Reference https://gnutls.org/security-new.html#GNUTLS-SA-2020-06-03
    Added Reference https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6C4DHUKV6M6SJ5CV6KVHZNHNF7HCUE5P/
    Added Reference https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6RTXZOXC4MHTFE2HKY6IAZMF2WHD2WMV/
    Added Reference https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RRQBFK3UZ7SV76IYDTS4PS6ABS2DSJHK/
    Added Reference https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VMB3UGI5H5RCFRU6OGRPMNUCNLJGEN7Y/
    Added Reference https://security.gentoo.org/glsa/202006-01
    Added Reference https://security.netapp.com/advisory/ntap-20200619-0004/
    Added Reference https://usn.ubuntu.com/4384-1/
    Added Reference https://www.debian.org/security/2020/dsa-4697
  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • CVE Modified by [email protected]

    Nov. 07, 2023

    Action Type Old Value New Value
    Added Reference MITRE https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VMB3UGI5H5RCFRU6OGRPMNUCNLJGEN7Y/ [No types assigned]
    Added Reference MITRE https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6C4DHUKV6M6SJ5CV6KVHZNHNF7HCUE5P/ [No types assigned]
    Added Reference MITRE https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RRQBFK3UZ7SV76IYDTS4PS6ABS2DSJHK/ [No types assigned]
    Added Reference MITRE https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6RTXZOXC4MHTFE2HKY6IAZMF2WHD2WMV/ [No types assigned]
    Removed Reference MITRE https://lists.fedoraproject.org/archives/list/[email protected]/message/VMB3UGI5H5RCFRU6OGRPMNUCNLJGEN7Y/
    Removed Reference MITRE https://lists.fedoraproject.org/archives/list/[email protected]/message/6RTXZOXC4MHTFE2HKY6IAZMF2WHD2WMV/
    Removed Reference MITRE https://lists.fedoraproject.org/archives/list/[email protected]/message/6C4DHUKV6M6SJ5CV6KVHZNHNF7HCUE5P/
    Removed Reference MITRE https://lists.fedoraproject.org/archives/list/[email protected]/message/RRQBFK3UZ7SV76IYDTS4PS6ABS2DSJHK/
  • Modified Analysis by [email protected]

    Mar. 01, 2023

    Action Type Old Value New Value
    Changed Reference Type http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00015.html No Types Assigned http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00015.html Broken Link
    Changed Reference Type https://lists.fedoraproject.org/archives/list/[email protected]/message/6C4DHUKV6M6SJ5CV6KVHZNHNF7HCUE5P/ No Types Assigned https://lists.fedoraproject.org/archives/list/[email protected]/message/6C4DHUKV6M6SJ5CV6KVHZNHNF7HCUE5P/ Mailing List, Third Party Advisory
    Changed Reference Type https://lists.fedoraproject.org/archives/list/[email protected]/message/6RTXZOXC4MHTFE2HKY6IAZMF2WHD2WMV/ No Types Assigned https://lists.fedoraproject.org/archives/list/[email protected]/message/6RTXZOXC4MHTFE2HKY6IAZMF2WHD2WMV/ Mailing List, Third Party Advisory
    Changed Reference Type https://lists.fedoraproject.org/archives/list/[email protected]/message/RRQBFK3UZ7SV76IYDTS4PS6ABS2DSJHK/ No Types Assigned https://lists.fedoraproject.org/archives/list/[email protected]/message/RRQBFK3UZ7SV76IYDTS4PS6ABS2DSJHK/ Mailing List, Third Party Advisory
    Changed Reference Type https://security.netapp.com/advisory/ntap-20200619-0004/ No Types Assigned https://security.netapp.com/advisory/ntap-20200619-0004/ Third Party Advisory
    Changed CPE Configuration OR *cpe:2.3:o:canonical:ubuntu_linux:19.10:*:*:*:*:*:*:* *cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:* *cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* *cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:* OR *cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:* *cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*
    Added CPE Configuration OR *cpe:2.3:o:canonical:ubuntu_linux:19.10:*:*:*:*:*:*:* *cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:*
    Added CPE Configuration OR *cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
  • CPE Deprecation Remap by [email protected]

    Aug. 18, 2020

    Action Type Old Value New Value
    Changed CPE Configuration OR *cpe:2.3:o:debian:debian_linux:10:*:*:*:*:*:*:* OR *cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
  • CVE Modified by [email protected]

    Jun. 19, 2020

    Action Type Old Value New Value
    Added Reference https://security.netapp.com/advisory/ntap-20200619-0004/ [No Types Assigned]
  • CVE Modified by [email protected]

    Jun. 14, 2020

    Action Type Old Value New Value
    Added Reference https://lists.fedoraproject.org/archives/list/[email protected]/message/6RTXZOXC4MHTFE2HKY6IAZMF2WHD2WMV/ [No Types Assigned]
    Added Reference https://lists.fedoraproject.org/archives/list/[email protected]/message/6C4DHUKV6M6SJ5CV6KVHZNHNF7HCUE5P/ [No Types Assigned]
    Added Reference https://lists.fedoraproject.org/archives/list/[email protected]/message/RRQBFK3UZ7SV76IYDTS4PS6ABS2DSJHK/ [No Types Assigned]
  • CVE Modified by [email protected]

    Jun. 10, 2020

    Action Type Old Value New Value
    Added Reference http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00015.html [No Types Assigned]
  • Initial Analysis by [email protected]

    Jun. 10, 2020

    Action Type Old Value New Value
    Added CVSS V2 NIST (AV:N/AC:M/Au:N/C:P/I:P/A:N)
    Added CVSS V3.1 NIST AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
    Changed Reference Type https://gnutls.org/security-new.html#GNUTLS-SA-2020-06-03 No Types Assigned https://gnutls.org/security-new.html#GNUTLS-SA-2020-06-03 Vendor Advisory
    Changed Reference Type https://lists.fedoraproject.org/archives/list/[email protected]/message/VMB3UGI5H5RCFRU6OGRPMNUCNLJGEN7Y/ No Types Assigned https://lists.fedoraproject.org/archives/list/[email protected]/message/VMB3UGI5H5RCFRU6OGRPMNUCNLJGEN7Y/ Mailing List, Third Party Advisory
    Changed Reference Type https://security.gentoo.org/glsa/202006-01 No Types Assigned https://security.gentoo.org/glsa/202006-01 Third Party Advisory
    Changed Reference Type https://usn.ubuntu.com/4384-1/ No Types Assigned https://usn.ubuntu.com/4384-1/ Third Party Advisory
    Changed Reference Type https://www.debian.org/security/2020/dsa-4697 No Types Assigned https://www.debian.org/security/2020/dsa-4697 Third Party Advisory
    Added CWE NIST CWE-327
    Added CPE Configuration OR *cpe:2.3:a:gnu:gnutls:*:*:*:*:*:*:*:* versions from (including) 3.6.0 up to (excluding) 3.6.14
    Added CPE Configuration OR *cpe:2.3:o:canonical:ubuntu_linux:19.10:*:*:*:*:*:*:* *cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:* *cpe:2.3:o:debian:debian_linux:10:*:*:*:*:*:*:* *cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*
  • CVE Modified by [email protected]

    Jun. 10, 2020

    Action Type Old Value New Value
    Added Reference https://usn.ubuntu.com/4384-1/ [No Types Assigned]
  • CVE Modified by [email protected]

    Jun. 09, 2020

    Action Type Old Value New Value
    Added Reference https://security.gentoo.org/glsa/202006-01 [No Types Assigned]
  • CVE Modified by [email protected]

    Jun. 07, 2020

    Action Type Old Value New Value
    Added Reference https://lists.fedoraproject.org/archives/list/[email protected]/message/VMB3UGI5H5RCFRU6OGRPMNUCNLJGEN7Y/ [No Types Assigned]
  • CVE Modified by [email protected]

    Jun. 07, 2020

    Action Type Old Value New Value
    Added Reference https://www.debian.org/security/2020/dsa-4697 [No Types Assigned]
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
Vulnerability Scoring Details
Base CVSS Score: 7.4
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact
Base CVSS Score: 5.8
Access Vector
Access Complexity
Authentication
Confidentiality Impact
Integrity Impact
Availability Impact
Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

0.91 }} -0.17%

score

0.74875

percentile