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IBM DB2 Remote DoS during CONNECT processing
------------------------------------------------------------------------
SUMMARY
When connecting to a remote DB2 instance, the version 7 client typically
sends a SQLJRA packet requesting start of the connection. If this SQLJRA
packet is specially crafted, it can cause a DoS attack by crashing the DB2
instance. Altering a few bytes at specific offsets in the packet exposes
multiple NULL/invalid pointer dereference bugs in the server code. For
example, on Windows, if 0x00 is used at any of these offsets, the
sqle_db2ra_as_con_database function (from DB2ENGN.DLL) attempts to access
NULL or invalid memory locations, causing an unhandled access violation
(0xC0000005). This causes the DB2 instance to crash.
DETAILS
Vulnerable Systems:
* All versions of IBM DB2 Database Server
A malicious CONNECT data stream sent to a DB2 server from V7 client may
cause instance crash, resulting in a denial of service. Server crashes
with the following stack trace back:
-------Frame------ ------Function + Offset------
0x2022DF24
sqle_db2ra_as_con_database__FP17sqle_db2ra_commonP10sqle_db2raP1
0sqler_glob + 0x268 0x2022D7CC
sqle_db2ra_as_con_driver__FP17sqle_db2ra_commonP10sqle_db2raP10s
qler_glob + 0x2A4 0xDA3AF114 sqledDb2raServerDriver + 0x129C
0xDB3FF900 sqljsDriveRequests__FP13sqle_agent_cbP11UCconHandle +
0x134 0xDB3FC480 sqljsDrdaAsInnerDriver__FP17sqlcc_init_structb
+ 0x2B4 0xDB3FBF60 sqljsDrdaAsDriver__FP17sqlcc_init_struct +
0x10C 0x200464EC sqleRunAgent__FPcUl + 0x578 0xD9598398
sqloCreateEDU__FPFPcUl_vPcUlP13SQLO_EDU_INFOPl + 0x304
0xD9597EF8 sqloSpawnEDU + 0x4CC
Fix:
To fix the problem apply the fixpak 13 for DB2 version 8.1 (same as 8.2
FP6)
<http://www-306.ibm.com/software/data/db2/udb/support/downloadv8.html>
http://www-306.ibm.com/software/data/db2/udb/support/downloadv8.html
CVE Information:
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-4257>
CVE-2006-4257
ADDITIONAL INFORMATION
The information has been provided by <mailto:shatter@appsecinc.com> Team
SHATTER.
The original article can be found at:
<http://www.appsecinc.com/resources/alerts/db2/2006-09-05.shtml>
http://www.appsecinc.com/resources/alerts/db2/2006-09-05.shtml
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