CISA orders federal agencies to patch CVE-2022
Vulnerabilities mentionedAll →
| CVE | Vulnerability | CVSS | EPSS | Flags | Affected | Exposure | Published |
|---|---|---|---|---|---|---|---|
| CVE-2022-26925 | Spoofing Flaw in Windows LSA (CVE-2022-26925) Exploited Against Domain Controllers CVE-2022-26925 is a spoofing vulnerability in the Windows Local Security Authority (LSA) that lets an unauthenticated network attacker make a spoofed call to LSA on a remote Windows host. It is triggered over the network with no user interaction, typically by coercing a Windows system—most critically a domain controller—into authenticating via NTLM to an attacker-controlled machine, in the manner of the PetitPotam forced-authentication attacks referenced in CISA's catalog update. By spoofing the client when LSA processes that authentication, the attacker undermines NTLM's authentication guarantees and, when chained with relay techniques, can authenticate to a domain controller with elevated privileges, which is reflected in the CVSS high-integrity impact. Any organization running affected Windows clients or Windows Server versions is exposed, with domain controllers the highest-value targets. The flaw was exploited as a zero-day before Microsoft's June 2022 Patch Tuesday fixes and is now listed in CISA's Known Exploited Vulnerabilities catalog, with CISA ordering federal agencies to patch. Do: Apply Microsoft's June 2022 Patch Tuesday updates (per CISA's guidance for the June Microsoft patch, https://www.cisa.gov/guidance-applying-june-microsoft-patch) across all affected Windows versions, prioritizing domain controllers; systems that cannot yet patch should be protected with NTLM-related mitigations (e.g., enforced SMB signing, LDAP signing/channel binding, and restricting or auditing NTLM use) per CISA/Microsoft remediation guidance. Check whether domain controllers are internet-exposed or reachable from untrusted networks, and hunt for signs of forced-authentication/relay activity. Note that a related PetitPotam KEV entry was superseded, so ensure this newer LSA fix—not just the older PetitPotam patch—is deployed. | 5.9 | 11% | KEV |
| mass≈1 billion+ Windows installations worldwide (essentially every Windows environment, and domain controllers at virtually every Windows-running organization) |
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US Critical Infrastructure Security Agency (CISA) adds CVE-2022-26925 Windows LSA flaw to its Known Exploited Vulnerabilities Catalog.
In May the US CISA removed the CVE-2022-26925 Windows LSA vulnerability from its Known Exploited Vulnerabilities Catalog due to Active Directory (AD) certificate authentication problems observed after the installation of Microsoft’s May 2022 Patch Tuesday security updates.
“CISA is temporarily removing CVE-2022-26925 from its Known Exploited Vulnerability Catalog due to a risk of authentication failures when the May 10, 2022 Microsoft rollup update is applied to domain controllers. After installing May 10, 2022 rollup update on domain controllers, organizations might experience authentication failures on the server or client for services, such as Network Policy Server (NPS), Routing and Remote access Service (RRAS), Radius, Extensible Authentication Protocol (EAP), and Protected Extensible Authentication Protocol (PEAP).” reads the advisory published by CISA. “Microsoft notified CISA of this issue, which is related to how the mapping of certificates to machine accounts is being handled by the domain controller.”
According to Binding Operational Directive (BOD) 22-01: Reducing the Significant Risk of Known Exploited Vulnerabilities, FCEB agencies have to address the identified vulnerabilities by the due date to protect their networks against attacks exploiting the flaws in the catalog.
Experts recommend also private organizations review the Catalog and address the vulnerabilities in their infrastructure.
The flaw is a Windows LSA Spoofing vulnerability actively exploited in the wild. The vulnerability can be exploited by an unauthenticated attacker to force a domain controller to authenticate against another server using NTLM.
“An unauthenticated attacker could call a method on the LSARPC interface and coerce the domain controller to authenticate to the attacker using NTLM. This security update detects anonymous connection attempts in LSARPC and disallows it.” read the advisory published by Microsoft.
Now the US organization added again the CVE-2022-26925 to the catalog and orders Federal agencies to fix the vulnerability by July 22.
The agency also released guidance on applying June Microsoft patch Tuesday update for CVE-2022-26925.
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