OpenBSD isakmpd replay protection bypass
| openbsd-isakmpd-security-bypass (28645) |  Low Risk |
Description:
OpenBSD could allow a remote attacker to bypass IPSec packet replay protection, caused by a vulnerability in isakmpd. When responding to security association negotiations, isakmpd creates a size zero (0) replay window. This could allow a remote attacker to capture and then replay packets without being detected.
*CVSS:
| Base Score: | 3.5 |
| Access Vector: | Remote |
| Access Complexity: | Low |
| Authentication: | Not Required |
| Confidentiality Impact: | None |
| Integrity Impact: | Partial |
| Availability Impact: | None |
| Temporal Score: | 2.6 |
| Exploitability: | Unproven |
| Remediation Level: | Official-Fix |
| Report Confidence: | Confirmed |
Consequences:
Bypass Security
Remedy:
For OpenBSD 3.8:
Apply the patch for this vulnerability, as listed in OpenBSD 3.8 errata - 013: SECURITY FIX: August 25, 2006. See References.
For OpenBSD 3.9:
Apply the patch for this vulnerability, as listed in OpenBSD 3.9 errata - 008: SECURITY FIX: August 25, 2006. See References.
For Debian GNU/Linux:
Refer to DSA-1175-1 for patch, upgrade, or suggested workaround information. See References.
References:
- OpenBSD 3.8 errata: 013: SECURITY FIX: August 25, 2006 .
- OpenBSD 3.9 errata: 008: SECURITY FIX: August 25, 2006.
- BID-19712: OpenBSD ISAKMPD IPsec Replay Vulnerability
- CVE-2006-4436: isakmpd in OpenBSD 3.8, 3.9, and possibly earlier versions, creates Security Associations (SA) with a replay window of size 0 when isakmpd acts as a responder during SA negotiation, which allows remote attackers to replay IPSec packets and bypass the replay protection.
- DSA-1175: isakmpd -- programming error
- OSVDB ID: 28194: OpenBSD isakmpd IPSec Packet Replay
- SA21652: OpenBSD isakmpd IPSec Sequence Number Verification Bypass
- SECTRACK ID: 1016757: OpenBSD isakmpd Error Lets Remote Users Bypass the Replay Protection
Platforms Affected:
- Debian Debian Linux 3.1
- OpenBSD OpenBSD 3.8
- OpenBSD OpenBSD 3.9
Reported:
Aug 25, 2006
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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.