Vstack cisco12/22/2023 The Cyber Fusion Center strongly cautions that messages such as these should not be used for attribution.Īdditionally, CVE-2018-0171 could allow remote attackers to completely compromise the device, allowing unauthorized access to an organizations network, exposing protected assets, and could allow attackers to program backdoors on affected systems for persistent access. Additionally, attacks in Russia, Iran, and other Middle Eastern countries have reset devices and shown taunting messages and an American flag. The Cyber Fusion Center has also seen active mass exploitation of these vulnerabilities, including the use of publicly available Proof of Concept (POC) code for CVE-2018-0171 to wipe devices configurations and reset them to factory default. CVE-2018-0171 has been assigned a CVSS score of 9.8 out of 10.0. The ability for unauthenticated remote attackers to execute arbitrary code on Cisco networks devices by exploiting a feature that is enable and remotely exposed by default makes the criticality of these vulnerabilities extremely high. Remote attackers can send specially crafted Smart Install message packets to an effected device and cause arbitrary remote code execution (RCE), wipe a devices configuration and force a reload of the of the affected system, obtain full control of the system, or to cause indefinite loops on affected devices which cause critical processes to crash. Causing an indefinite loop on the affect device which causes important system processes to crash.Execution of arbitrary code (including potentially installing persistent backdoors).A “reload” of the affected device, resetting the system to factory default configuration(s).A successful exploit of CVE-2018-0171 allows remote, unauthenticated attackers to cause a buffer overflow on affected devices which could cause: Cisco Smart Install service listens on TCP port 4786 by default. The vulnerabilities are due to improper validation of Smart Install package data. The Cisco Smart Install (SMI) feature is enabled by default on Cisco switch software. Cisco Smart Install is a plug-and-play configuration management feature intended to allow zero-touch deployments of new network switches. Two recent critical and high severity Denial of Service (DOS) and Remote Code Execution (RCE) vulnerabilities have been disclosed in Cisco Smart Install (SMI) clients. Please review the “Mitigations and Response” section of this advisory. If updating network devices is not feasible and clients do not use SMI, two non-impactful workarounds and temporary mitigations are available. The Cyber Fusion Center highly recommends updating devices to the latest version of Cisco IOS or Cisco IOS XE which mitigate these and several other critical vulnerabilities. The Cisco Smart Install functionality is enabled by default on Cisco IOS and IOS XE switches that have not been updated to the latest Cisco software releases. These attacks impact Cisco Smart Install (SMI) client switches (known as integrated branch clients (IBCs), typically access layer switches). The Cyber Fusion Center has tracked attacks across internet facing devices as well as internalswitches which are reachable across site-to-site VPNs. Attackers are actively leveraging these vulnerabilities to reset vulnerable devices to factory default settings and force device restarts, resulting in a Denial of Service (DOS) condition. The Cyber Fusion Center has learned of malicious, seemly automated, exploitation of recent Cisco IOS and Cisco IOS XE critical vulnerabilities (CVE-2018-0171 & CVE-2018-0156) within Cisco Smart Install to cause mass network outages.
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