{"enchantments": {"score": {"value": 7.5, "vector": "NONE"}, "vulnersScore": 7.5}, "reporter": "CERT", "id": "VU:323172", "cvss": {"score": 0.0, "vector": "NONE"}, "published": "2011-02-16T00:00:00", "history": [], "description": "### Overview\n\nA vulnerability exists in the way the Microsoft Windows browser service handles Browser Election messages.\n\n### Description\n\nFrom [Description of the Microsoft Computer Browser Service](<http://support.microsoft.com/kb/188001>): \n\n_\"The browser service maintains a list of the domain name or workgroup name the computer is in, and the protocol being used for each computer on the network segment being served by the computer running the browser service. On each network segment, a master browser is elected from the group of computers located on the segment that are running the browser service.\"_ \n \nThe computer browser service protocol driver contains an integer underflow error in browser election message handling, which can cause a kernel pool buffer overrun resulting in memory corruption. \n \nThe vulnerable code is only reached if the computer is the Master Browser. However, according to the Microsoft Security Research and Defense[ blog](<http://blogs.technet.com/b/srd/>), the election of the Master Browser varies depending on network configuration: \n \n_\"In normal enterprise networks the Primary Domain Controller (PDC) will become Master Browser, but depending on the network configuration, other computers on the network can become Master Browser, and therefore be vulnerable. A single system will be Master Browser at any point in time.\"_ \n \nFor more information, please see Microsoft Security Bulletin [MS11-019](<http://www.microsoft.com/technet/security/bulletin/MS11-019.mspx>). \n \n--- \n \n### Impact\n\nUsing a specially crafted Browser Election message, an attacker may be able to cause a Denial of Service (DoS) or execute arbitrary code. \n \n--- \n \n### Solution\n\n**Apply an update** \nMicrosoft addresses this vulnerability with the updates listed in Microsoft Security Bulletin [MS11-19](<http://www.microsoft.com/technet/security/bulletin/MS11-019.mspx>). \n \n--- \n \n \n**Restrict Access** \n \nRestrict access to the server's broadcast domain and block UDP ports 137, 138 and TCP ports 139, 445 at the network perimeter using firewall rules. \n \n--- \n \n### Vendor Information \n\nVendor| Status| Date Notified| Date Updated \n---|---|---|--- \nMicrosoft Corporation| | -| 15 Apr 2011 \nIf you are a vendor and your product is affected, [let us know](<mailto:cert@cert.org?Subject=VU%23323172 Vendor Status Inquiry>).\n\n### CVSS Metrics \n\nGroup | Score | Vector \n---|---|--- \nBase | N/A | N/A \nTemporal | N/A | N/A \nEnvironmental | N/A | N/A \n \n### References\n\n * <http://www.microsoft.com/technet/security/bulletin/MS11-019.mspx>\n * <http://blogs.technet.com/b/mmpc/archive/2011/02/16/my-sweet-valentine-the-cifs-browser-protocol-heap-corruption-vulnerability.aspx>\n * <http://blogs.technet.com/b/srd/archive/2011/02/16/notes-on-exploitability-of-the-recent-windows-browser-protocol-issue.aspx>\n * <http://lists.grok.org.uk/pipermail/full-disclosure/2011-February/079189.html>\n\n### Credit\n\nThis document was written by David Warren.\n\n### Other Information\n\n * CVE IDs: Unknown\n * Date Public: 14 Feb 2011\n * Date First Published: 16 Feb 2011\n * Date Last Updated: 15 Apr 2011\n * Severity Metric: 18.73\n * Document Revision: 17\n\n", "bulletinFamily": "info", "viewCount": 1, "cvelist": [], "type": "cert", "hash": "2f013acee6f347e1304f21bcf4d6fcbbc52ce9f97c501911e3b7adc399e302a2", "references": ["http://www.microsoft.com/technet/security/bulletin/MS11-019.mspx", "http://www.microsoft.com/technet/security/bulletin/MS11-019.mspx", "http://www.microsoft.com/technet/security/bulletin/MS11-019.mspx", "http://lists.grok.org.uk/pipermail/full-disclosure/2011-February/079189.html", "http://blogs.technet.com/b/mmpc/archive/2011/02/16/my-sweet-valentine-the-cifs-browser-protocol-heap-corruption-vulnerability.aspx", "http://blogs.technet.com/b/srd/archive/2011/02/16/notes-on-exploitability-of-the-recent-windows-browser-protocol-issue.aspx", "http://support.microsoft.com/kb/188001", "http://blogs.technet.com/b/srd/"], "title": "Microsoft Windows browser election message kernel pool overflow", "href": "https://www.kb.cert.org/vuls/id/323172", "lastseen": "2016-02-03T09:12:30", "edition": 1, "objectVersion": "1.2", "modified": "2011-04-15T00:00:00"}

{}