Overview
Microsoft Windows DNS servers are vulnerable to heap overflow attacks, enabling unauthenticated attackers to send malicious requests to affected servers.
Description
CWE-122: Heap-based Buffer Overflow - CVE-2018-8626 Microsoft Windows Domain Name System (DNS) servers are vulnerable to heap overflow attacks. Microsoft acknowledges that "an attacker who successfully exploited the vulnerability could run arbitrary code in the context of the Local System Account." This remote code execution vulnerability exists in Windows DNS servers when they fail to properly handle requests. |
Impact
Windows servers that are configured as DNS servers are at risk from this vulnerability. A successful attack could allow the execution of arbitrary code. Symantec also notes that an unsuccessful attack results in a denial-of-service. |
Solution
Apply an update |
Vendor Information
CVSS Metrics
| Group | Score | Vector |
|---|---|---|
| Base | 9.7 | AV:N/AC:L/Au:N/C:C/I:C/A:P |
| Temporal | 9.7 | E:ND/RL:ND/RC:ND |
| Environmental | 9.7 | CDP:ND/TD:ND/CR:ND/IR:ND/AR:ND |
References
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8626
- https://cwe.mitre.org/data/definitions/122.html
- https://www.symantec.com/security-center/vulnerabilities/writeup/106076
- https://www.us-cert.gov/ncas/current-activity/2018/12/11/Microsoft-Releases-December-2018-Security-Updates
Acknowledgements
Thanks to Mitch Adair from Microsoft for reporting this vulnerability.
This document was written by Eric Hatleback.
Other Information
| CVE IDs: | CVE-2018-8626 |
| Date Public: | 2018-11-12 |
| Date First Published: | 2019-01-04 |
| Date Last Updated: | 2019-01-04 18:01 UTC |
| Document Revision: | 13 |