Horizon Alert
Summary of the vulnerability and why it matters
A vulnerability exists within the Smart Install feature of Cisco IOS and IOS XE Software. This flaw arises from inadequate validation of packet data. An attacker could exploit this by sending a specially crafted message, potentially leading to a device reload, denial of service, or the execution of arbitrary code. This could disrupt network operations and compromise device integrity.
- Cisco IOS and IOS XE Software Smart Install feature
- Improper validation of packet data
- Device reloads, denial of service, code execution
Attack Path
How an attacker could exploit the issue
A network-accessible feature in Cisco IOS and IOS XE Software has a flaw in how it handles packet data. An unauthenticated, remote attacker can exploit this by sending a specially crafted message to the device. This action could lead to a buffer overflow, potentially causing the device to reload, an indefinite loop leading to a crash, or even allowing the attacker to execute arbitrary code.
- Exposure on TCP port 4786.
- Unauthenticated remote attacker access.
- Sending crafted Smart Install message.
- Arbitrary code execution or device reload.
Live Threat
Current exploitation, exposure, and threat context
The Smart Install feature in Cisco IOS and IOS XE Software has a critical vulnerability. Attackers can exploit this flaw to cause devices to reload, leading to denial-of-service, or to execute arbitrary code. This occurs by sending specially crafted messages to an affected device. The potential for code execution and denial of service presents a significant business risk.
- Attacker skill level: Low
- Required access or conditions: Network access
- Business risk or urgency: High
Priority actions
Operational Fix
Recommended remediation, mitigation, and detection steps
A critical vulnerability has been identified in Cisco IOS and IOS XE Software affecting the Smart Install feature. This flaw could permit an unauthenticated, remote attacker to cause a denial-of-service condition or execute arbitrary code on an affected device. The exploit involves sending a specially crafted message to TCP port 4786, which could lead to a buffer overflow.
- Identify exposed Cisco devices.
- Disable the Smart Install feature.
- Apply vendor updates and verify.
- Monitor for related activity.
