Cisco IOS Software contains a vulnerability in the Cisco IOS Firewall Application Inspection Control feature that could allow an unauthenticated, remote attacker to case a denial of service condition. Updated software is available.
Cisco IOS Software contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial or service (DoS) condition.
The vulnerability exists due to an error by the Cisco IOS Firewall Application Inspection Control (AIC) feature. An unauthenticated, remote attacker could exploit this vulnerability by sending malicious HTTP packets to the target device. The packets could cause the target device to reload.
Exploit code exists.
Cisco has confirmed this vulnerability and released updated software.
Cisco has published a list of affected Cisco IOS products in the security advisory.
Cisco indicated through CVSS scoring the existence of functional exploit code; however, this exploit code is not known to be publicly available.
This vulnerability requires a specific configuration to be used for an exploit to be successful. This configuration may not be common in most environments, limiting the attacker's ability to exploit this vulnerability.
An unauthenticated, remote attacker could exploit this vulnerability to cause the target device to reload. Repeated exploitation could result in a persistent DoS condition.
The vulnerability affects systems that are configured to run Cisco IOS Firewall AIC with policies configured for specific applications. An unauthenticated, remote attacker could exploit this vulnerability by sending malicious HTTP transit packets to the target device after a valid TCP three-way handshake occurs. The packets could cause the target device to reload.
Administrators are advised to apply the appropriate updates.
Administrators may consider disabling AIC HTTP deep packet inspection until a patch can be applied.
Administrators are advised to monitor affected systems for signs of exploitation.
Cisco customers with active contracts can obtain updates through the Software Center at the following link: Cisco. Cisco customers without contracts can obtain upgrades by contacting the Cisco Technical Assistance Center at 1-800-553-2447 or 1-408-526-7209 or via e-mail at firstname.lastname@example.org.
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