Microsoft SQL Server Resolution Service keep-alive function denial of service
| mssql-resolution-keepalive-dos (9662) |  Medium Risk |
Description:
Microsoft SQL Server 2000 is vulnerable to a denial of service attack, caused by a vulnerability in the keep-alive function in the SQL Server Resolution Service. The keep-alive function is used to direct client requests to the proper port when multiple instances of the SQL Server are running on the same system. If a remote attacker sends a specially-crafted keep-alive packet with a spoofed source address to the Resolution Service on UDP port 1434, the attacker could cause multiple SQL Server systems to enter into an infinite loop of exchanging the same packet between each other. This could cause a decrease in performance on the affected systems, which would be caused by increased CPU and network bandwidth usage. The affected systems must then be rebooted or the SQL Service processes must be restarted to regain normal functionality.
Note: This vulnerability also affects Cisco CallManager version 3.3(x), Cisco Unity versions 3.x and 4.x, and Cisco Building Broadband Service Manager versions 5.0 and 5.1, which incorporate the use of either SQL Server 2000 or MSDE 2000.
*CVSS:
| Base Score: | 3.5 |
| Access Vector: | Remote |
| Access Complexity: | Low |
| Authentication: | Not Required |
| Confidentiality Impact: | None |
| Integrity Impact: | None |
| Availability Impact: | Partial |
| Temporal Score: | 2.6 |
| Exploitability: | Unproven |
| Remediation Level: | Official-Fix |
| Report Confidence: | Confirmed |
Consequences:
Denial of Service
Remedy:
Apply the patch for this vulnerability, as listed in Microsoft Security Bulletin MS02-039. See References.
For Cisco CallManager, Cisco Unity, and Cisco Building Broadband Service Manager: Refer to Cisco Security Advisory 2003 January 26 05:30 GMT for upgrade or patch information. See References.
References:
- CERT Advisory CA-2002-22: Multiple Vulnerabilities in Microsoft SQL Server.
- CIAC Information Bulletin M-102: Microsoft SQL Server 2000 Resolution Service Buffer Overflow Vulnerabilities.
- cisco-sa-20030126-ms02-061: Cisco Security Advisory: Microsoft SQL Server 2000 Vulnerabilities in Cisco Products - MS02-061.
- Microsoft Security Bulletin MS02-039: Buffer Overruns in SQL Server 2000 Resolution Service Could Enable Code Execution (Q323875).
- NGSSoftware Insight Security Research Advisory #NISR25072002: Unauthenticated Remote Compromise in MS SQL Server 2000.
- SQLSecurity.com Web site: SQL Server/MSDE-Based Applications.
- BID-5312: Microsoft SQL Server 2000 Resolution Service Denial of Service Vulnerability
- CVE-2002-0650: The keep-alive mechanism for Microsoft SQL Server 2000 allows remote attackers to cause a denial of service (bandwidth consumption) via a ping style packet to the Resolution Service (UDP port 1434) with a spoofed IP address of another SQL Server system, which causes the two servers to exchange packets in an infinite loop.
- OSVDB ID: 878: Microsoft SQL Resolution Service Keep-Alive Function DoS
- US-CERT VU#370308: Microsoft SQL Server 2000 contains denial-of-service vulnerability in SQL Server Resolution Service
Platforms Affected:
- Cisco Building Broadband Service Manager 5.0
- Cisco Building Broadband Service Manager 5.1
- Cisco Unified CallManager 3.3
- Cisco Unity Server 3.0
- Cisco Unity Server 4.0
- Microsoft Data Engine
- Microsoft SQL Server 2000
- Microsoft Windows XP Home
- Microsoft Windows XP Professional
Reported:
Jul 24, 2002
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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.