Multiple vulnerabilities in Active Directory Federation Services (ADFS)

Published: 2019-07-10 | Updated: 2019-07-10
Severity Medium
Patch available YES
Number of vulnerabilities 2
CVE ID CVE-2019-0975
CVE-2019-1126
CWE ID CWE-399
CWE-799
Exploitation vector Network
Public exploit N/A
Vulnerable software Windows Server Subscribe
Vendor Microsoft

Security Advisory

1) Resource management error

Severity: Low

CVSSv3: 3.7 [CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-0975

CWE-ID: CWE-399 - Resource Management Errors

Description

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

The vulnerability exists due to the way Active Directory Federation Services (ADFS) performs updates for the list of banned IP addresses. A remote attacker can convince the ADFS administrator to update a list of banned IP addresses and bypass security restrictions

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Windows Server: 1803, 1903, 2016, 2019

CPE External links

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-0975

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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

2) Improper control of interaction frequency

Severity: Medium

CVSSv3: 4.6 [CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C] [PCI]

CVE-ID: CVE-2019-1126

CWE-ID: CWE-799 - Improper Control of Interaction Frequency

Description

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

The vulnerability exists due to the way Active Directory Federation Services (ADFS) handles external authentication requests. A remote attacker can perform a brute-force attack and cause account lockouts in Active Directory.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Windows Server: 1803, 1903, 2012 R2, 2016, 2019

CPE External links

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1126

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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