Microsoft Reclassifies SPNEGO Extended Negotiation Security Vulnerability as 'Critical'
Vulnerabilities mentionedAll →
| CVE | Vulnerability | CVSS | EPSS | Flags | Affected | Exposure | Published |
|---|---|---|---|---|---|---|---|
| CVE-2017-0144 | Remote Code Execution in Microsoft SMBv1 (EternalBlue) affecting Windows and Siemens devices CVE-2017-0144 is a remote code execution flaw in the SMBv1 server component of Microsoft Windows, commonly known as EternalBlue, and one of the SMB flaws fixed by Microsoft in the March 2017 MS17-010 bulletin. An attacker who can reach the SMB service over the network sends specially crafted packets that trigger memory corruption in the SMBv1 implementation, gaining the ability to execute arbitrary code on the target without user interaction. Successful exploitation yields full system compromise and has been heavily weaponized for wormable spread and ransomware delivery, notably via the leaked NSA exploit and in the WannaCry/NotPetya-era outbreaks, and the flaw has repeatedly been bundled into botnets and ransomware tooling since. Anyone running unpatched Windows Vista SP2 through Windows 10 1607 / Windows Server 2016 with SMBv1 enabled is affected, as are Siemens medical and laboratory devices (ACUSON ultrasound, syngo SC2000, Tissue Preparation System, VERSANT kPCR systems) whose firmware depends on SMBv1. Exploitation is actively ongoing: the flaw is in CISA's Known Exploited Vulnerabilities catalog (added 2022-02-10) with known ransomware use, carries a 99.2% EPSS exploitation probability (100th percentile), and multiple public exploits and PoCs are available. Do: Apply the Microsoft MS17-010 (March 2017) security updates on every listed Windows version and the corresponding Siemens firmware updates for ACUSON, syngo SC2000, Tissue Preparation System, and VERSANT kPCR devices, per CISA's required action to apply vendor updates. Where patching is not yet possible, disable SMBv1 or block inbound TCP 445 (and UDP 137/138) at network boundaries and isolate legacy/medical systems from the internet. Sweep exposed and legacy hosts for compromise indicators, including DOUBLEPULSAR implants delivered over SMB, as public tooling for detecting and neutralizing this implant is available. | 8.8 | 99% | KEV ransomware PoC ×6 |
| massorder of hundreds of thousands of internet-exposed SMB endpoints, and millions of unpatched Windows systems when internal enterprise and medical-device… | |
| CVE-2022-37958 | SPNEGO Extended Negotiation (NEGOEX) Security Mechanism Remote Code Execution Vulnerability SPNEGO Extended Negotiation (NEGOEX) Security Mechanism Remote Code Execution Vulnerability NVD description · AI analysis pending | 8.1 | 86% |
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Full article313 words · extracted from thehackernews.com · click to collapse
Ravie LakshmananDec 15, 2022Windows Security / Network Security
Microsoft has revised the severity of a security vulnerability it originally patched in September 2022, upgrading it to "Critical" after it emerged that it could be exploited to achieve remote code execution.
Tracked as CVE-2022-37958 (CVSS score: 8.1), the flaw was previously described as an information disclosure vulnerability in SPNEGO Extended Negotiation (NEGOEX) Security Mechanism.
SPNEGO, short for Simple and Protected GSSAPI Negotiation Mechanism (SPNEGO), is a scheme that allows a client and remote server to arrive at a consensus on the choice of the protocol to be used (e.g., Kerberos or NTLM) for authentication.
But a further analysis of the flaw by IBM Security X-Force researcher Valentina Palmiotti found that it could allow remote execution of arbitrary code, prompting Microsoft to reclassify its severity.
"This vulnerability is a pre-authentication remote code execution vulnerability impacting a wide range of protocols," IBM said this week. "It has the potential to be wormable."
Specially, the shortcoming could enable remote code execution via any Windows application protocol that authenticates, including HTTP, SMB, and RDP. Given the criticality of the issue, IBM said it's withholding technical details until Q2 2023 to give organizations enough time to apply the fixes.
"Successful exploitation of this vulnerability requires an attacker to prepare the target environment to improve exploit reliability," Microsoft cautioned in its updated advisory.
"Unlike the vulnerability (CVE-2017-0144) exploited by EternalBlue and used in the WannaCry ransomware attacks, which only affected the SMB protocol, this vulnerability has a broader scope and could potentially affect a wider range of Windows systems due to a larger attack surface of services exposed to the public internet (HTTP, RDP, SMB) or on internal networks," IBM noted.
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Text extracted automatically; images, tables and formatting may be missing. Original: https://thehackernews.com/2022/12/microsoft-reclassifies-spnego-extended.html