Vulnerability Note VU#827267

Microsoft Server service RPC stack buffer overflow vulnerability

The Server service provides RPC support, file print support and named pipe sharing over the network. The Server service allows the sharing of your local resources (such as disks and printers) so that other users on the network can access them. It also allows named pipe communication between applications running on other computers and your computer, which is used for RPC.

Certain versions of malicious code called Conficker or Downadup attempt to exploit this vulnerability.

III. Solution

Block or Restrict Access

Block access to SMB services (139/tcp, 445/tcp) from untrusted networks such as the Internet. This and additional workarounds are provide in Microsoft Security Bulletin MS08-067.

Systems Affected

http://www.microsoft.com/technet/security/Bulletin/ms08-067.mspx
http://blogs.technet.com/swi/archive/2008/10/23/More-detail-about-MS08-067.aspx
http://www.microsoft.com/technet/security/bulletin/ms08-oct.mspx
http://blogs.msdn.com/sdl/archive/2008/10/22/ms08-067.aspx
https://www.securecoding.cert.org/confluence/display/seccode/FIO02-C.+Canonicalize+path+names+originating+from+untrusted+sources
https://www.securecoding.cert.org/confluence/display/seccode/STR31-C.+Guarantee+that+storage+for+strings+has+sufficient+space+for+character+data+and+the+null+terminator

Credit

Thanks to Microsoft for reporting this vulnerability.

This document was written by Will Dormann.

Other Information

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