SB2019071015 - Multiple vulnerabilities in Active Directory Federation Services (ADFS)

Description

This security bulletin contains information about 2 vulnerabilities.

1) Resource management error (CVE-ID: CVE-2019-0975)

CWE-ID: CWE-399 - Resource Management Errors

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear

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

2) Improper control of interaction frequency (CVE-ID: CVE-2019-1126)

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

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green

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.

Remediation

Install update from vendor's website.

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-0975
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1126