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Security Intelligence Operations
Cisco IOS Firewall Application Inspection Control Denial of Service Vulnerability |
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| Vulnerability Alert | Powered by  |
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| Threat Type: | Unintended Weakness: Denial of Service |
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| IntelliShield ID: | 16661 |
| Version: | 1 |
| First Published: | September 24, 2008 02:22 PM EDT |
| Last Published: | September 24, 2008 02:22 PM EDT |
| Vector: | Network |
| Authentication: | None |
| Exploit: | Functional |
| Port: | 80 |
| CVE: | CVE-2008-3812 |
| BugTraq ID: | 31354 |
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| Urgency: |
Unlikely Use
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| Credibility: |
Confirmed
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| Severity: |
Mild Damage
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| CVSS Base: | 7.8 |
CVSS Calculator
CVSS Version 2
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| CVSS Temporal: | 6.4 |
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| Version Summary: | 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. |
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| Description |
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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. |
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| Warning Indicators |
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Cisco has published a list of affected Cisco IOS products in the security advisory. |
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| IntelliShield Analysis |
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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. |
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| Vendor Announcements |
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| Cisco has released a security advisory for Cisco bug ID CSCsh12480 at the following link: cisco-sa-20080924-iosfw |
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| Impact |
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An unauthenticated, remote attacker could exploit this vulnerability to cause the target device to reload. Repeated exploitation could result in a persistent DoS condition. |
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| Technical Information |
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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. |
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| Safeguards |
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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. |
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| Patches/Software |
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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 tac@cisco.com. |
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| Signatures |
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| Alert History |
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Initial Release |
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Product Sets |
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The security vulnerability applies to the following combinations of products.
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LEGAL DISCLAIMER
The urgency and severity ratings of this alert are not tailored to individual users; users may value alerts differently based upon their network configurations and circumstances. THE ALERT, AND INFORMATION CONTAINED THEREIN, ARE PROVIDED ON AN "AS IS" BASIS AND DO NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE ALERT, AND INFORMATION CONTAINED THEREIN, OR MATERIALS LINKED FROM THE ALERT, IS AT YOUR OWN RISK. INFORMATION IN THIS ALERT AND ANY RELATED COMMUNICATIONS IS BASED ON OUR KNOWLEDGE AT THE TIME OF PUBLICATION AND IS SUBJECT TO CHANGE WITHOUT NOTICE. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE ALERTS AT ANY TIME. |
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