Privilege escalation in Microsoft Windows Text Service Framework



Published: 2019-09-10
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2019-1235
CWE-ID CWE-345
Exploitation vector Local
Public exploit N/A
Vulnerable software
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Windows
Operating systems & Components / Operating system

Windows Server
Operating systems & Components / Operating system

Vendor Microsoft

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Insufficient verification of data authenticity

EUVDB-ID: #VU21009

Risk: Low

CVSSv3.1: 6.1 [CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-1235

CWE-ID: CWE-345 - Insufficient Verification of Data Authenticity

Exploit availability: No

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due insufficient validation of input data origin within the Windows Text Service Framework (TSF) server, sent through a malicious Input Method Editor (IME). A local user can run a specially crafted application and escalate privileges on the system.

Successful exploitation of the vulnerability requires that IME is installed on the system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Windows: 7 - 10 1903

Windows Server: 2008 - 2019 1903

External links

http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1235


Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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