Multiple vulnerabilities in Microsoft Windows Hard Link



Published: 2020-03-10
Risk Low
Patch available YES
Number of vulnerabilities 4
CVE-ID CVE-2020-0849
CVE-2020-0841
CVE-2020-0840
CVE-2020-0896
CWE-ID CWE-264
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 information about 4 vulnerabilities.

1) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU25924

Risk: Low

CVSSv3.1: 6.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-0849

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

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

The vulnerability exists due to the way Windows handles hard links. A local user can create a malicious application, launch it on the system and overwrite a targeted file leading to an elevated status.

To exploit this vulnerability, an attacker would first have to log on to the system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Windows: 7 - 10 1909

Windows Server: 2008 - 2019 1909


CPE2.3 External links

http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0849

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.

2) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU25923

Risk: Low

CVSSv3.1: 6.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-0841

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

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

The vulnerability exists due to the way Windows handles hard links. A local user can create a malicious application, launch it on the system and overwrite a targeted file leading to an elevated status.

To exploit this vulnerability, an attacker would first have to log on to the system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Windows: 10 - 10 1909

Windows Server: 2016 - 2019 1909


CPE2.3 External links

http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0841

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.

3) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU25922

Risk: Low

CVSSv3.1: 6.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-0840

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

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

The vulnerability exists due to the way Windows handles hard links. A local user can create a malicious application, launch it on the system and overwrite a targeted file leading to an elevated status.

To exploit this vulnerability, an attacker would first have to log on to the system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Windows: 8.1 - 10 1909

Windows Server: 2012 R2 - 2019 1909


CPE2.3 External links

http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0840

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.

4) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU25921

Risk: Low

CVSSv3.1: 6.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-0896

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

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

The vulnerability exists due to the way Windows handles hard links. A local user can create a malicious application, launch it on the system and overwrite a targeted file leading to an elevated status.

To exploit this vulnerability, an attacker would first have to log on to the system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Windows: 10 - 10 1909

Windows Server: 2016 - 2019 1909


CPE2.3 External links

http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0896

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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