Cisco IDS/IPS fragmented packet security bypass
| cisco-ips-frag-bypass (29058) |  Medium Risk |
Description:
Multiple versions of Cisco Intrusion Prevention System (IPS) could allow a remote attacker to bypass protection. By using specially-crafted fragmented IP packets a remote attacker could bypass IPS traffic inspection and perform undetected malicious activity on systems protected by the affected device.
*CVSS:
| Base Score: | 5 |
| Access Vector: | Remote |
| Access Complexity: | Low |
| Authentication: | Not Required |
| Confidentiality Impact: | None |
| Integrity Impact: | Complete |
| Availability Impact: | None |
| Temporal Score: | 3.7 |
| Exploitability: | Unproven |
| Remediation Level: | Official-Fix |
| Report Confidence: | Confirmed |
Consequences:
Bypass Security
Remedy:
Refer to cisco-sa-20060920-ips for upgrade information. See References.
References:
- cisco-sa-20060920-ips: Cisco Security Advisory: Cisco Intrusion Prevention System Management Interface Denial of Service and Fragmented Packet Evasion Vulnerabilities.
- BID-20127: Cisco IPS/IDS Fragmented Packets Inspection Bypass Vulnerability
- CVE-2006-4911: Unspecified vulnerability in Cisco IPS 5.0 before 5.0(6p2) and 5.1 before 5.1(2), when running in inline or promiscuous mode, allows remote attackers to bypass traffic inspection via a crafted sequence of fragmented IP packets.
- OSVDB ID: 29036: Cisco IPS Fragmented IP Packet Sequence Detection Bypass
- SA22022: Cisco Intrusion Prevention System Fragmented IP Packets Security Bypass
- SECTRACK ID: 1016891: Cisco Intrusion Prevention System Lets Remote Users Deny Service or Evade Detection
- US-CERT VU#658884: Cisco IPS fails to properly check fragmented IP packets
- VUPEN/ADV-2006-3721: Cisco Intrusion Prevention and Detection Systems DoS and Security Bypass
Platforms Affected:
- Cisco Intrusion Prevention System 5.0(6)P1
- Cisco Intrusion Prevention System 5.1(1)
Reported:
Sep 20, 2006
The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall the author/distributor (IBM Internet Security Systems X-Force) be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.
For corrections or additions please email xforce@iss.net
* According to the Forum of Incident Response and Security Teams (FIRST), the Common Vulnerability Scoring System (CVSS) is an "industry open standard designed to convey vulnerability severity and help to determine urgency and priority of response." IBM PROVIDES THE CVSS SCORES "AS IS" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY.
The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall IBM be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.