CVE-2019-18988
TeamViewer Desktop Bypass Remote Login Vulnerabili - [Actively Exploited]
Description
TeamViewer Desktop through 14.7.1965 allows a bypass of remote-login access control because the same key is used for different customers' installations. It used a shared AES key for all installations since at least as far back as v7.0.43148, and used it for at least OptionsPasswordAES in the current version of the product. If an attacker were to know this key, they could decrypt protect information stored in the registry or configuration files of TeamViewer. With versions before v9.x , this allowed for attackers to decrypt the Unattended Access password to the system (which allows for remote login to the system as well as headless file browsing). The latest version still uses the same key for OptionPasswordAES but appears to have changed how the Unattended Access password is stored. While in most cases an attacker requires an existing session on a system, if the registry/configuration keys were stored off of the machine (such as in a file share or online), an attacker could then decrypt the required password to login to the system.
INFO
Published Date :
Feb. 7, 2020, 4:15 p.m.
Last Modified :
Aug. 24, 2020, 5:37 p.m.
Source :
[email protected]
Remotely Exploitable :
No
Impact Score :
5.9
Exploitability Score :
1.0
CISA KEV (Known Exploited Vulnerabilities)
For the benefit of the cybersecurity community and network defenders—and to help every organization better manage vulnerabilities and keep pace with threat activity—CISA maintains the authoritative source of vulnerabilities that have been exploited in the wild.
TeamViewer Desktop allows for bypass of remote-login access control because the same AES key is used for different customers' installations. If an attacker were to know this key, they could decrypt protected information stored in registry or configuration files or decryption of the Unattended Access password to the system (which allows for remote login to the system).
Apply updates per vendor instructions.
Public PoC/Exploit Available at Github
CVE-2019-18988 has a 11 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-2019-18988.
| URL | Resource |
|---|---|
| https://community.teamviewer.com/t5/Announcements/Specification-on-CVE-2019-18988/td-p/82264 | Vendor Advisory |
| https://community.teamviewer.com/t5/Knowledge-Base/tkb-p/Knowledgebase?threadtype=label&labels=Security | Vendor Advisory |
| https://twitter.com/Blurbdust/status/1224212682594770946?s=20 | Third Party Advisory |
| https://whynotsecurity.com/blog/teamviewer/ | Exploit Third Party Advisory |
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).
Here I gather all the resources about hacking that I find interesting
automation penetration-testing bughunting red-teaming
Ruby JavaScript
Information and tools for working with the TeamViewer OptionsPasswordHash value
Python
Ostorlab KEV: One-command to detect most remotely known exploitable vulnerabilities. Sourced from CISA KEV, Google's Tsunami, Ostorlab's Asteroid and Bug Bounty programs.
cisa-kev vulnerability 0day cisa exploits
None
C#
None
None
None
TeamViewer Store Credentials Decryption
Batchfile
None
Python
Tool to extract TeamViewer encrypted passwords from Windows Registry
PowerShell
Enumerate and decrypt TeamViewer credentials from Windows registry
pentesting teamviewer
C#
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2019-18988 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2019-18988 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]
May. 14, 2024
Action Type Old Value New Value -
CWE Remap by [email protected]
Aug. 24, 2020
Action Type Old Value New Value Changed CWE CWE-287 CWE-521 -
Initial Analysis by [email protected]
Feb. 14, 2020
Action Type Old Value New Value Added CVSS V2 NIST (AV:L/AC:M/Au:N/C:P/I:P/A:P) Added CVSS V3.1 NIST AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H Changed Reference Type https://community.teamviewer.com/t5/Announcements/Specification-on-CVE-2019-18988/td-p/82264 No Types Assigned https://community.teamviewer.com/t5/Announcements/Specification-on-CVE-2019-18988/td-p/82264 Vendor Advisory Changed Reference Type https://community.teamviewer.com/t5/Knowledge-Base/tkb-p/Knowledgebase?threadtype=label&labels=Security No Types Assigned https://community.teamviewer.com/t5/Knowledge-Base/tkb-p/Knowledgebase?threadtype=label&labels=Security Vendor Advisory Changed Reference Type https://twitter.com/Blurbdust/status/1224212682594770946?s=20 No Types Assigned https://twitter.com/Blurbdust/status/1224212682594770946?s=20 Third Party Advisory Changed Reference Type https://whynotsecurity.com/blog/teamviewer/ No Types Assigned https://whynotsecurity.com/blog/teamviewer/ Exploit, Third Party Advisory Added CWE NIST CWE-287 Added CPE Configuration OR *cpe:2.3:a:teamviewer:teamviewer:*:*:*:*:*:*:*:* versions up to (including) 14.7.1965
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2019-18988 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-2019-18988
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.36 }} 0.11%
score
0.69018
percentile