Cisco IOS DHCP Bug Lets Remote Users Deny Service
SecurityTracker Alert ID: 1027572|
SecurityTracker URL: http://securitytracker.com/id/1027572
(Links to External Site)
Date: Sep 26 2012
Denial of service via network|
Fix Available: Yes Vendor Confirmed: Yes |
A vulnerability was reported in Cisco IOS. A remote user can cause denial of service conditions.|
A remote user can send a specially crafted DHCP packet to or through the target device to cause the target device to reload.
Cisco has assigned Cisco bug ID CSCty96049 to this vulnerability.
The vulnerability resides in the Device Sensor feature.
Cisco IOS XE and IOS XR are not affected.
A remote user can cause denial of service conditions.|
The vendor has issued a fix.|
A patch matrix is available in the vendor's advisory.
The vendor's advisory is available at:
Vendor URL: tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20120926-dhcp (Links to External Site)
Source Message Contents
Subject: Cisco Security Advisory: Cisco IOS Software DHCP Denial of Service Vulnerability|
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Cisco IOS Software DHCP Denial of Service Vulnerability
Advisory ID: cisco-sa-20120926-dhcp
For Public Release 2012 September 26 16:00 UTC (GMT)
Cisco IOS Software contains a vulnerability that could allow an
unauthenticated, remote attacker to cause a denial of service (DoS)
condition. An attacker could exploit this vulnerability by sending a
single DHCP packet to or through an affected device, causing the
device to reload.
Cisco has released free software updates that address this
vulnerability. A workaround that mitigates this vulnerability is
available. This advisory is available at the following link:
Note: The September 26, 2012, Cisco IOS Software Security Advisory
bundled publication includes 9 Cisco Security Advisories. Eight of the
advisories address vulnerabilities in Cisco IOS Software, and one
advisory addresses a vulnerability in Cisco Unified Communications
Manager. Each Cisco IOS Software Security Advisory lists the Cisco IOS
Software releases that correct the vulnerability or vulnerabilities
detailed in the advisory as well as the Cisco IOS Software releases
that correct all Cisco IOS Software vulnerabilities in the September
2012 bundled publication.
Individual publication links are in "Cisco Event Response: Semi-Annual
Cisco IOS Software Security Advisory Bundled Publication" at the
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