SQL Server Vulnerability : Dec 21

This thread has been Locked and is not open to further replies. Please start a New Thread if you're having a similar issue. View our Welcome Guide to learn how to use this site.


Thread Starter
Malware Specialist
Mar 19, 2001

SQL Server 7.0 and 2000 provide a number of functions that enable
database queries to generate text messages. In some cases, the
functions create a text message and store it in a variable; in
others, the functions directly display the message. Two
vulnerabilities associated with these functions have been discovered.

The first vulnerability results because of a flaw in the functions
themselves. Several of the functions don't adequately verify that the
requested text will fit into the buffer that's supplied to hold it. A
buffer overrun could occur as a result, and could be used either to
run code in the security context of the SQL Server service or to
cause the SQL Server service to fail. SQL Server can be configured to
run in various security contexts, and by default runs as a domain
user. The precise privileges the attacker could gain would depend on
the specific security context that the service runs in.

The second vulnerability results because of a format string
vulnerability in the C runtime functions that the SQL Server
functions call when installed on Windows NT(r) 4.0, Windows(r) 2000
or Windows XP. Although format string vulnerabilities often can be
exploited to run code of the attacker's choice, that is not true in
this case. Because of the specific way this vulnerability occurs, the
C Runtime code would always be overrun with the same values
regardless of the attacker's inputs. As a result, this vulnerability
could only be used as a denial of service.

An attacker could exploit the vulnerabilities in either of two ways.
The most direct way would be for the attacker to simply load and
execute a database query that calls one of the affected functions.
Alternatively, if a web site or other database front-end would accept
and process arbitrary queries, it could be possible for the attacker
to provide inputs that would cause the query to call an affected
function with the appropriate parameters.

Because the two vulnerabilities have different root causes, there are
separate patches for each. Microsoft recommends that the SQL Server
patch be applied to all affected servers. However, we recommend that
customers carefully weigh whether they need to apply the C runtime
patch. We make this recommendation for two reasons:

The C runtime vulnerability only allows denial of service attacks, so
the threat it poses is somewhat lower.
The C runtime plays a crucial role in the operating system itself.
While we are confident that both patches are well-tested, if there
were a regression error in the C runtime, the effects would likely be
serious and widespread.

Microsoft SQL Server 7.0
Microsoft SQL Server 2000



This thread has been Locked and is not open to further replies. Please start a New Thread if you're having a similar issue. View our Welcome Guide to learn how to use this site.

Users Who Are Viewing This Thread (Users: 0, Guests: 1)

As Seen On
As Seen On...

Welcome to Tech Support Guy!

Are you looking for the solution to your computer problem? Join our site today to ask your question. This site is completely free -- paid for by advertisers and donations.

If you're not already familiar with forums, watch our Welcome Guide to get started.

Join over 807,865 other people just like you!

Latest posts