The Simple Network Management Protocol (SNMP) subsystem of Cisco IOS and IOS XE Software contains multiple vulnerabilities that could allow an authenticated, remote attacker to remotely execute code on an affected system or cause an affected system to reload. An attacker could exploit these vulnerabilities by sending a crafted SNMP packet to an affected system via IPv4 or IPv6. Only traffic directed to an affected system can be used to exploit these vulnerabilities.
The vulnerabilities are due to a buffer overflow condition in the SNMP subsystem of the affected software. The vulnerabilities affect all versions of SNMP - Versions 1, 2c, and 3. To exploit these vulnerabilities via SNMP Version 2c or earlier, the attacker must know the SNMP read-only community string for the affected system. To exploit these vulnerabilities via SNMP Version 3, the attacker must have user credentials for the affected system. A successful exploit could allow the attacker to execute arbitrary code and obtain full control of the affected system or cause the affected system to reload.
Customers are advised to apply the workaround as contained in the Workarounds section below. Fixed software information is available via the Cisco IOS Software Checker. All devices that have enabled SNMP and have not explicitly excluded the affected MIBs or OIDs should be considered vulnerable.
The urgency for defenders is critical. Organizations should prioritize patching immediately.
Vulnerability Details
The vulnerabilities in question allow for remote code execution due to a buffer overflow condition in the SNMP subsystem. The CVSS score for this vulnerability is 8.8, which classifies it as high severity. Affected products include Cisco IOS and IOS XE Software. The vulnerability was published on July 17, 2017, and is classified under CWE-119.
Technical Analysis
The root cause of the vulnerability lies in a buffer overflow condition within the SNMP subsystem. The attack vector is network-based, meaning that attackers can exploit it remotely. The attack complexity is low, requiring only minimal effort to exploit. The privileges required are low, as an attacker only needs to be authenticated to the device. Importantly, user interaction is not required for the exploitation to succeed.
The impact on confidentiality, integrity, and availability is high, as a successful exploitation could lead to full control over the affected system or cause it to reload.
Risk & Impact Analysis
Risk to organizations includes potential unauthorized access and control over critical network devices, resulting in severe operational disruptions. The urgency assessment based on the CVSS score indicates that organizations should address this vulnerability in their priority patch cycle.
Given the wide range of devices potentially affected, the blast radius is extensive, emphasizing the need for immediate action.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | Yes |
Ransomware Use | No |
Affected Versions
This vulnerability affects all versions of Cisco IOS and IOS XE Software, specifically from the following version ranges: IOS versions 12.0 to 12.4, and 15.0 to 15.6, as well as IOS XE versions 2.2 to 3.17.
Mitigation & Remediation
Organizations should apply updates as per vendor instructions immediately. Workarounds are available; however, they should be treated as temporary solutions. For more detailed guidance, organizations can refer to the Cisco IOS Software Checker to ensure their systems are secure.
Detection Guidance
Organizations should monitor logs for unusual SNMP traffic patterns that may indicate exploitation attempts. Behavioral anomalies in network performance or unexpected reboots of devices can also serve as indicators of compromise.
AppSecure Threat Intelligence Insight
The long-term significance of this vulnerability lies in its potential for widespread exploitation among organizations utilizing Cisco IOS and IOS XE Software in their networks. It reflects the critical need for proactive security measures and consistent patch management practices to prevent similar vulnerabilities from being exploited in the future. Security teams must stay vigilant and prioritize vulnerability management programs to ensure their network defenses are robust.
For further insights into managing vulnerabilities, organizations can explore resources on vulnerability management programs and the importance of penetration testing in identifying security gaps.
Lastly, organizations should consider engaging in API security testing to bolster their defenses against similar vulnerabilities.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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