Multiple Heap Overflows Allow Remote

Description

Various bugs in Samba’s NDR parsing can allow a user
to send specially crafted MS-RPC requests that will
overwrite the heap space with user defined data.

Patch Availability

A patch against Samba 3.0.24 has been posted at

http://www.samba.org/samba/security/

Workaround

There is no immediate workaround for this defect that does
not involve changing the server code in the smbd daemon.
The Samba Team always encourages users to run the latest
stable release as a defense against attacks. If this
is not immediately possible, administrators should read
the “Server Security” documentation found at

http://www.samba.org/samba/docs/server_security.html

Credits

This vulnerability was discovered by an anonymous researcher and reported
to Samba developers by Brian Schafer, TippingPoint Security Response Lead,
as part of the Zero Day Initiative (http://www.zerodayinitiative.com).

The time line is as follows:

• April 25, 2007: Four individual defects reported to the
  [email protected] email alias.
• April 25, 2007: Initial developer response by Samba
  developer Volker Lendecke.
• April 28, 2007: Patches for four defects released by
  Samba developer Jeremy Allison to ZDI for testing.
• May 3, 2007: Fixed confirmed by original reporter.
• May 5, 2007: Fifth defect reported to [email protected].
• May 5, 2007: Patches for fifth defects released to ZDI
  for testing by Samba developer Jeremy Allison.
• May 10, Announcement to vendor-sec mailing list
• May 14, 2007: Public announcement of the security issue.

== Our Code, Our Bugs, Our Responsibility.
== The Samba Team