Microsoft Windows DNS client data string buffer overflow
| dns-data-string-bo (28240) |  High Risk |
Description:
Microsoft DNS client software is vulnerable to a heap-based buffer overflow, caused by improper bounds checking of DNS packets. By sending a malicious DNS response to any valid DNS query by the client, a remote attacker could overflow a buffer and execute arbitrary code on the system with the privileges used when the DNS client was invoked.
To exploit this vulnerability, the attacker needs to either entice a victim to query a specific DNS server, or to sniff network traffic and send DNS responses to questions a client has asked of another DNS server.
*CVSS:
| Base Score: | 8 |
| Access Vector: | Remote |
| Access Complexity: | High |
| Authentication: | Not Required |
| Confidentiality Impact: | Complete |
| Integrity Impact: | Complete |
| Availability Impact: | Complete |
| Temporal Score: | 5.9 |
| Exploitability: | Unproven |
| Remediation Level: | Official-Fix |
| Report Confidence: | Confirmed |
Consequences:
Gain Access
Remedy:
Apply the appropriate patch for your system, as listed in Microsoft Security Bulletin MS06-041. See References.
References:
- Internet Security Systems Protection Advisory August 8, 2006: Microsoft DNS Client Character String Buffer Overflow Vulnerability.
- Microsoft Security Bulletin MS06-041: Vulnerabilities in DNS Resolution Could Allow Remote Code Execution (920683).
- BID-19404: Microsoft Windows DNS Client Buffer Overrun Vulnerability
- CVE-2006-3441: Buffer overflow in the DNS Client service in Microsoft Windows 2000 SP4, XP SP1 and SP2, and Server 2003 SP1 allows remote attackers to execute arbitrary code via a crafted record response. NOTE: while MS06-041 implies that there is a single issue, there are multiple vectors, and likely multiple vulnerabilities, related to (1) a heap-based buffer overflow in a DNS server response to the client, (2) a DNS server response with malformed ATMA records, and (3) a length miscalculation in TXT, HINFO, X25, and ISDN records.
- SA21394: Windows DNS Resolution Code Execution Vulnerabilities
- SECTRACK ID: 1016653: Windows Winsock and DNS Client Buffer Overflows Let Remote Users Execute Arbitrary Code
- US-CERT VU#794580: Microsoft DNS Client buffer overflow
- VUPEN/ADV-2006-3211: Microsoft Windows Winsock Hostname and DNS Client Vulnerabilities (MS06-041)
Platforms Affected:
- Microsoft Windows 2000 SP4
Reported:
Aug 08, 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.