CVE-2019-19495

Current 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.

Basic Data

PublishedFebruary 07, 2020
Last ModifiedFebruary 14, 2020
Assignercve@mitre.org
Data TypeCVE
Data FormatMITRE
Data Version4.0
Problem TypeCWE-287
CVE Data Version4.0

Base Metric V2

CVSS 2 - Version2.0
CVSS 2 - Vector StringAV:L/AC:M/Au:N/C:P/I:P/A:P
CVSS 2 - Access VectorLOCAL
CVSS 2 - Access ComplexityMEDIUM
CVSS 2 - AuthenticationNONE
CVSS 2 - Confidentiality ImpactPARTIAL
CVSS 2 - Availability ImpactPARTIAL
CVSS 2 - Base Score4.4
SeverityMEDIUM
Exploitability Score3.4
Impact Score6.4
Obtain All Privilegefalse
Obtain User Privilegefalse
Obtain Other Privilegefalse

Base Metric V3

No data provided.

Configurations

  • OR - Configuration 1
    Cpe VersionPartVendorProductVersionUpdateEditionLanguageSW EditionTarget SWTarget HWOtherVersion Start IncludingVersion End IncludingVersion Start ExcludingVersion End Excluding
    2.3ApplicationTeamviewerTeamviewer********14.7.1965

Vulnerable Software List

VendorProductVersions
Teamviewer Teamviewer *

References

NameSourceURLTags
https://community.teamviewer.com/t5/Announcements/Specification-on-CVE-2019-18988/td-p/82264https://community.teamviewer.com/t5/Announcements/Specification-on-CVE-2019-18988/td-p/82264MISCVendor Advisory
https://community.teamviewer.com/t5/Knowledge-Base/tkb-p/Knowledgebase?threadtype=label&labels=Securityhttps://community.teamviewer.com/t5/Knowledge-Base/tkb-p/Knowledgebase?threadtype=label&labels=SecurMISCVendor Advisory
https://twitter.com/Blurbdust/status/1224212682594770946?s=20https://twitter.com/Blurbdust/status/1224212682594770946?s=20MISCThird Party Advisory
https://whynotsecurity.com/blog/teamviewer/https://whynotsecurity.com/blog/teamviewer/MISCExploit Third Party Advisory