Horizon Alert
Summary of the vulnerability and why it matters
The Simple Network Management Protocol (SNMP) subsystem in Cisco IOS and IOS XE Software is vulnerable. This flaw allows an authenticated attacker to remotely execute code on affected systems or cause them to reload. Such an exploit could grant attackers full control or disrupt operations.
- Vulnerable: Cisco IOS/IOS XE SNMP subsystem
- Flaw: Buffer overflow in SNMP
- Impact: Code execution, system reload
Attack Path
How an attacker could exploit the issue
This vulnerability can be exploited by an authenticated attacker sending a specially crafted Simple Network Management Protocol (SNMP) packet to an affected system. The SNMP subsystem contains a buffer overflow, which, if successfully exploited, could allow the attacker to execute arbitrary code. This could lead to an attacker gaining full control of the affected system or causing it to reload, impacting system availability and data integrity.
- Exposed SNMP subsystem.
- Authenticated attacker sends crafted packet.
- Attacker gains code execution or causes reload.
Live Threat
Current exploitation, exposure, and threat context
This vulnerability could allow an attacker to gain control of affected systems or cause them to stop working. Exploitation requires specific access to the system, such as knowledge of a read-only community string or valid user credentials. The potential for remote code execution and system compromise presents a significant business risk.
- Attacker skill level: Likely moderate.
- Required access or conditions: Authenticated access or SNMP community string.
- Business risk or urgency: High risk, potential for system control.
Priority actions
Operational Fix
Recommended remediation, mitigation, and detection steps
This vulnerability in Cisco IOS and IOS XE Software's SNMP subsystem could permit an authenticated, remote attacker to execute code or cause system reloads. Exploitation requires sending a crafted SNMP packet to an affected system, with specific authentication or community string knowledge depending on the SNMP version used. Successful exploitation could grant an attacker full control of the system or lead to a denial of service.
- Identify systems with SNMP enabled.
- Restrict SNMP access to trusted networks.
- Apply vendor fixes and monitor systems.
