Security restrictions bypass in SQL Server Reporting Services (SSRS)

1) Arbitrary file upload

EUVDB-ID: #VU46407

Risk: Medium

CVSSv3.1: 4.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-1044

CWE-ID: CWE-434 - Unrestricted Upload of File with Dangerous Type

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass implemented security restrictions.

The vulnerability exists due to insufficient validation of attachments uploaded to reports in SQL Server Reporting Services (SSRS). A remote attacker can upload file types that were disallowed by an administrator.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Microsoft SQL Server Reporting Services (SSRS): 2017 - 2019

External links

http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1044

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.