CISA says to urgently patch actively exploited SeriousSAM/HiveNightmare flaw affecting Windows 11

Laptop security

The CISA (US Cybersecurity and Infrastructure Security Agency) has published a list of 15 actively exploited software vulnerabilities, encouraging users of Windows and macOS to install the available patches.

Included in the list is the SeriousSAM vulnerability that is also known as HiveNightmare affects Windows 10 and 11. Tracked as CVE-2021-36934, this is a local privilege escalation vulnerability that makes it possible for an attacker to grab password hashes from the registry and gain admin privileges.

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While most home users should find that they already have the necessary patches installed to secure their systems against this and the other vulnerabilities, the CISA warning is really aimed at organizations, businesses and enterprise users.

In a post on its website, the security agency says:

CISA has added 15 new vulnerabilities to its Known Exploited Vulnerabilities Catalog, based on evidence that threat actors are actively exploiting the vulnerabilities listed in the table below. These types of vulnerabilities are a frequent attack vector for malicious cyber actors of all types and pose significant risk to the federal enterprise.

The full list of vulnerabilities added to the CISA catalog reads:

CVE NumberCVE TitleRemediation Due DateCVE-2021-36934Microsoft Windows SAM Local Privilege Escalation Vulnerability2/24/2022CVE-2020-0796Microsoft SMBv3 Remote Code Execution Vulnerability8/10/2022CVE-2018-1000861Jenkins Stapler Web Framework Deserialization of Untrusted Data Vulnerability8/10/2022CVE-2017-9791Apache Struts 1 Improper Input Validation Vulnerability8/10/2022CVE-2017-8464Microsoft Windows Shell (.lnk) Remote Code Execution Vulnerability8/10/2022CVE-2017-10271Oracle Corporation WebLogic Server Remote Code Execution Vulnerability8/10/2022CVE-2017-0263Microsoft Win32k Privilege Escalation Vulnerability8/10/2022CVE-2017-0262Microsoft Office Remote Code Execution Vulnerability8/10/2022CVE-2017-0145Microsoft SMBv1 Remote Code Execution Vulnerability8/10/2022CVE-2017-0144Microsoft SMBv1 Remote Code Execution Vulnerability8/10/2022CVE-2016-3088 Apache ActiveMQ Improper Input Validation Vulnerability8/10/2022CVE-2015-2051D-Link DIR-645 Router Remote Code Execution8/10/2022CVE-2015-1635Microsoft HTTP.sys Remote Code Execution Vulnerability8/10/2022CVE-2015-1130Apple OS X Authentication Bypass Vulnerability8/10/2022CVE-2014-4404Apple OS X Heap-Based Buffer Overflow Vulnerability8/10/2022

CISA adds:

Although BOD 22-01 only applies to FCEB agencies, CISA strongly urges all organizations to reduce their exposure to cyberattacks by prioritizing timely remediation of Catalog vulnerabilities as part of their vulnerability management practice. CISA will continue to add vulnerabilities to the Catalog that meet the meet the specified criteria.

More information is available on the CISA website.

Image credit: peshkova / depositphotos

Author: Martha Meyer