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Privilege escalation in Microsoft Windows Background Intelligent Transfer Service



Published: 2020-06-09
Severity Medium
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2020-1255
CWE ID CWE-264
Exploitation vector Network
Public exploit N/A
Vulnerable software
Subscribe 		Windows
Operating systems & Components / Operating system

Windows Server
Operating systems & Components / Operating system

Vendor Microsoft

Security Advisory

This security advisory describes one medium risk vulnerability.

1) Permissions, Privileges, and Access Controls

Severity: Medium

CVSSv3: 7.4 [CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C] [PCI]

CVE-ID: CVE-2020-1255

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

Exploit availability: No

Description

The vulnerability allows a remote attacker to escalate privileges on the system.

The vulnerability exists due to the way Windows Background Intelligent Transfer Service (BITS) IIS module handles uploaded content. A remote authenticated attacker can upload restricted file types to an IIS-hosted folder

To exploit this vulnerability, an attacker would require permissions to upload files via BITS.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Windows: 7, 8.1, 10, 10 1607, 10 1709, 10 1803, 10 1809, 10 1903, 10 1909, 10 2004, RT 8.1

Windows Server: 2008, 2008 R2, 2012, 2012 R2, 2016, 2019, 2019 1803, 2019 1903, 2019 1909, 2019 2004

CPE External links

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1255

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

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