7.2
HIGH
CVE-2020-17049
Microsoft Kerberos Constrained Delegation Feature Bypass Vulnerability
Description

A security feature bypass vulnerability exists in the way Key Distribution Center (KDC) determines if a service ticket can be used for delegation via Kerberos Constrained Delegation (KCD). To exploit the vulnerability, a compromised service that is configured to use KCD could tamper with a service ticket that is not valid for delegation to force the KDC to accept it. The update addresses this vulnerability by changing how the KDC validates service tickets used with KCD.

INFO

Published Date :

Nov. 11, 2020, 7:15 a.m.

Last Modified :

Sept. 10, 2024, 4:15 p.m.

Source :

[email protected]

Remotely Exploitable :

Yes !

Impact Score :

5.9

Exploitability Score :

1.2
Public PoC/Exploit Available at Github

CVE-2020-17049 has a 42 public PoC/Exploit available at Github. Go to the Public Exploits tab to see the list.

Affected Products

The following products are affected by CVE-2020-17049 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 Microsoft windows_server_2012
2 Microsoft windows_server_2016
3 Microsoft windows_server_2019
4 Microsoft windows_server_20h2
5 Microsoft windows_server_1903
6 Microsoft windows_server_1909
7 Microsoft windows_server_2004
8 Microsoft windows_server_2012_r2
9 Microsoft windows_server_2008_r2
10 Microsoft windows_server_2008_sp2
1 Samba samba
: Total Affected Vendor : 2 | Products : 11
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-2020-17049.

URL Resource
http://www.openwall.com/lists/oss-security/2021/11/10/3 Mailing List Third Party Advisory
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-17049 Patch Vendor Advisory
https://security.gentoo.org/glsa/202309-06

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
VidyaBipin/Rubeus-CShrp-yara

None

YARA C#

Updated: 3 months ago
0 stars 0 fork 0 watcher
Born at : Aug. 22, 2024, 6:04 a.m. This repo has been linked 3 different CVEs too.
Profile Photo
sexyducati/rubeus-test

None

YARA C#

Updated: 3 months ago
0 stars 0 fork 0 watcher
Born at : Aug. 21, 2024, 9:01 p.m. This repo has been linked 3 different CVEs too.
Profile Photo
joker200-0/Rubeus

None

YARA C#

Updated: 3 months, 1 week ago
0 stars 0 fork 0 watcher
Born at : Aug. 14, 2024, 4:33 a.m. This repo has been linked 3 different CVEs too.
Profile Photo
santan2020/ck2

None

YARA C#

Updated: 4 months ago
0 stars 0 fork 0 watcher
Born at : July 17, 2024, 5:45 a.m. This repo has been linked 3 different CVEs too.
Profile Photo
syedrizvinet/lib-repos-Rubeus

None

YARA C#

Updated: 6 months, 4 weeks ago
0 stars 0 fork 0 watcher
Born at : April 24, 2024, 1:36 a.m. This repo has been linked 3 different CVEs too.
Profile Photo
Strokekilla/Rubeus

None

YARA C#

Updated: 7 months ago
0 stars 0 fork 0 watcher
Born at : April 21, 2024, 8:31 p.m. This repo has been linked 3 different CVEs too.
Profile Photo
ZyberPatrol/Active-Directory

Pentesting Active Directory

Updated: 7 months, 1 week ago
0 stars 0 fork 0 watcher
Born at : April 15, 2024, 7:54 a.m. This repo has been linked 17 different CVEs too.
Profile Photo
qobil7681/Password-cracker

None

YARA C#

Updated: 8 months, 1 week ago
0 stars 0 fork 0 watcher
Born at : March 12, 2024, 9:57 a.m. This repo has been linked 3 different CVEs too.
Profile Photo
Pascal-0x90/Rubeus

None

YARA C#

Updated: 8 months, 4 weeks ago
0 stars 0 fork 0 watcher
Born at : Feb. 24, 2024, 4 p.m. This repo has been linked 3 different CVEs too.
Profile Photo
pwnlog/PuroAD

Collection of links for AD purple teamers.

Updated: 4 months, 2 weeks ago
0 stars 0 fork 0 watcher
Born at : Feb. 17, 2024, 2:49 p.m. This repo has been linked 16 different CVEs too.
Profile Photo
hackeremmen/Active-Directory-Kill-Chain-Attack-Defense-

None

Updated: 9 months, 3 weeks ago
0 stars 0 fork 0 watcher
Born at : Jan. 29, 2024, 7:44 a.m. This repo has been linked 17 different CVEs too.
Profile Photo
OsandaMalith/Rubeus

None

YARA C#

Updated: 8 months, 2 weeks ago
0 stars 0 fork 0 watcher
Born at : July 30, 2023, 10:48 a.m. This repo has been linked 3 different CVEs too.
Profile Photo
suzi007/RedTeam_Note

None

Updated: 1 year, 3 months ago
0 stars 0 fork 0 watcher
Born at : July 22, 2023, 2:03 p.m. This repo has been linked 6 different CVEs too.
Profile Photo
mandradets/Maritest2

test

YARA C#

Updated: 1 year, 5 months ago
0 stars 0 fork 0 watcher
Born at : June 21, 2023, 12:32 a.m. This repo has been linked 1 different CVEs too.
Profile Photo
paramint/AD-Attack-Defense

None

Updated: 2 months, 2 weeks ago
12 stars 0 fork 0 watcher
Born at : March 23, 2023, 1:54 p.m. This repo has been linked 17 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-2020-17049 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2020-17049 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 [email protected]

    Sep. 10, 2024

    Action Type Old Value New Value
    Changed Description <p>A security feature bypass vulnerability exists in the way Key Distribution Center (KDC) determines if a service ticket can be used for delegation via Kerberos Constrained Delegation (KCD).</p> <p>To exploit the vulnerability, a compromised service that is configured to use KCD could tamper with a service ticket that is not valid for delegation to force the KDC to accept it.</p> <p>The update addresses this vulnerability by changing how the KDC validates service tickets used with KCD.</p> A security feature bypass vulnerability exists in the way Key Distribution Center (KDC) determines if a service ticket can be used for delegation via Kerberos Constrained Delegation (KCD). To exploit the vulnerability, a compromised service that is configured to use KCD could tamper with a service ticket that is not valid for delegation to force the KDC to accept it. The update addresses this vulnerability by changing how the KDC validates service tickets used with KCD.
  • CVE Modified by [email protected]

    May. 14, 2024

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

    Dec. 31, 2023

    Action Type Old Value New Value
    Changed Description Kerberos Security Feature Bypass Vulnerability <p>A security feature bypass vulnerability exists in the way Key Distribution Center (KDC) determines if a service ticket can be used for delegation via Kerberos Constrained Delegation (KCD).</p> <p>To exploit the vulnerability, a compromised service that is configured to use KCD could tamper with a service ticket that is not valid for delegation to force the KDC to accept it.</p> <p>The update addresses this vulnerability by changing how the KDC validates service tickets used with KCD.</p>
    Added CVSS V3.1 Microsoft Corporation AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
  • CVE Modified by [email protected]

    Sep. 17, 2023

    Action Type Old Value New Value
    Added Reference https://security.gentoo.org/glsa/202309-06 [No Types Assigned]
  • Reanalysis by [email protected]

    Aug. 29, 2022

    Action Type Old Value New Value
    Removed CWE NIST NVD-CWE-noinfo
    Added CWE NIST CWE-863
    Added CPE Configuration OR *cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:* versions from (including) 4.1.0 up to (excluding) 4.13.13 *cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:* versions from (including) 4.14.0 up to (excluding) 4.14.9 *cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:* versions from (including) 4.15.0 up to (excluding) 4.15.1
  • Modified Analysis by [email protected]

    Nov. 30, 2021

    Action Type Old Value New Value
    Changed Reference Type http://www.openwall.com/lists/oss-security/2021/11/10/3 No Types Assigned http://www.openwall.com/lists/oss-security/2021/11/10/3 Mailing List, Third Party Advisory
  • CVE Modified by [email protected]

    Nov. 10, 2021

    Action Type Old Value New Value
    Added Reference http://www.openwall.com/lists/oss-security/2021/11/10/3 [No Types Assigned]
  • CWE Remap by [email protected]

    Jul. 21, 2021

    Action Type Old Value New Value
    Changed CWE CWE-269 NVD-CWE-noinfo
  • Initial Analysis by [email protected]

    Nov. 23, 2020

    Action Type Old Value New Value
    Added CVSS V2 NIST (AV:N/AC:L/Au:S/C:C/I:C/A:C)
    Added CVSS V3.1 NIST AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
    Changed Reference Type https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-17049 No Types Assigned https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-17049 Patch, Vendor Advisory
    Added CWE NIST CWE-269
    Added CPE Configuration OR *cpe:2.3:o:microsoft:windows_server_2012:*:*:*:*:*:*:*:* *cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:* *cpe:2.3:o:microsoft:windows_server_2016:-:*:*:*:*:*:*:* *cpe:2.3:o:microsoft:windows_server_2016:20h2:*:*:*:*:*:*:* *cpe:2.3:o:microsoft:windows_server_2016:1903:*:*:*:*:*:*:* *cpe:2.3:o:microsoft:windows_server_2016:1909:*:*:*:*:*:*:* *cpe:2.3:o:microsoft:windows_server_2016:2004:*:*:*:*:*:*:* *cpe:2.3:o:microsoft:windows_server_2019:-:*:*:*:*:*:*:*
  • CVE Modified by [email protected]

    Nov. 12, 2020

    Action Type Old Value New Value
    Changed Description , aka 'Kerberos Security Feature Bypass Vulnerability'. Kerberos Security Feature Bypass Vulnerability
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.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2020-17049 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-2020-17049 weaknesses.

Exploit Prediction

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

2.45 }} -0.30%

score

0.90129

percentile

CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
: